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300-100 LPIC-3 Exam 300: Mixed Environments, version 1.0

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300-100 exam Dumps Source : LPIC-3 Exam 300: Mixed Environments, version 1.0

Test Code : 300-100
Test Name : LPIC-3 Exam 300: Mixed Environments, version 1.0
Vendor Name : LPI
: 118 Real Questions

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LPI LPIC-3 Exam 300: Mixed

LPI Certifications book: Overview and profession Paths | killexams.com Real Questions and Pass4sure dumps

credit score: LPI

The Linux knowledgeable Institute (LPI) is a nonprofit organization based mostly in Toronto, Canada, that promotes using Linux, open source and free software. one way wherein the corporation furthers its mission is to give seller-neutral Linux certifications to IT professionals all over the world. With "more than 500,000 exams delivered" to candidates and 400 practicing partners, LPI stakes a declare as “the realm’s first and biggest vendor-neutral Linux and open supply certification body” (LPI Their purpose web page).

With input from deepest industry, academia and individuals, Linux specialists provide enter on exam questions to make certain that they are rigorous, accurate and observe to any standard Linux system.

LPI Certification program Overview

The LPI certification application is primary. It comprises three certifications that build on one a further:

  • LPIC-1: Linux Administrator — Entry-level certification that acknowledges people who can installation and configure a pc working Linux, keep the gadget from the command line and configure a basic community
  • LPIC-2: Linux Engineer — Mid-stage certification designed for gurus who administer small- to medium-sized blended networks
  • LPIC-three: Linux enterprise expert — Senior-level certification that identifies Linux professionals who plan, conceptualize, design, put in force and troubleshoot Linux installations in business environments
  • every LPIC certification requires you to flow one or two assorted-option assessments, each and every of which expenses $188 and all of which are administered through Pearson VUE. All LPIC certifications are legitimate for 5 years.

    furthermore, LPI offers two other credentials. First, those just starting with Linux might also locate the Linux essentials certification a superb groundwork before leaping into the extra advanced LPIC certifications. 2nd, the LPI DevOps equipment Engineer credential offers these interested in DevOp subject matters and equipment an opportunity to establish and burnish such potential in Linux-primarily based environments. each of those certs are lined the sections that follow particulars on LPIC-1, -2, and -three below.

    LPIC-1: Linux Administrator

    in the LPI certification software, the LPIC-1: Linux Administrator is regarded a junior-level Linux certification that requires you to move two assessments: 101-four hundred and 102-four hundred. There aren't any must haves.

    The LPIC-1 one hundred and one-400 exam covers equipment structure, the nuts and bolts of Linux setting up, primary package management, GNU and Unix instructions, devices and file systems.

    The LPIC-1 102-400 examination assessments you on customizing the shell atmosphere, writing and operating scripts, and managing databases and operating SQL commands. You should also comprehend how to configure settings for user interfaces and the desktop, operate administrative tasks and manage device services, create community connections and at ease Linux techniques.

    LPI partner Certifications

    LPI and CompTIA have a 2-in-1 Linux certification program, which lets candidates acquire LPIC-1 certification after achieving the CompTIA Linux+ Powered by LPI. (This application previously covered the SUSE licensed Linux Administrator (CLA) certification – a 3-in-1 present – however the third leg of that tripod expired in 2016.)

    You should first get an LPI identity by using registering at the LPI web site. subsequent, take the CompTIA Linux+ Powered through LPI checks and indicate that you need your exam scores despatched to LPI upon a success completion. you're going to soon receive notification of your LPIC-1 certification from LPI.

    LPIC-2: Linux Engineer

    The LPIC-2: Linux Engineer is an advanced-stage Linux credential that requires a latest LPIC-1 certification as a prerequisite. To obtain the LPIC-2, you have to flow tests 201-450 and 202-450:

    The LPIC-2 201-450 exam dives into ability planning, manipulating the Linux kernel, configuring device startup functions and boot loaders, and configuring and protecting file techniques and gadgets. you will also be established on advanced storage machine administration, networking configuration and gadget upkeep.

    The LPIC-2 202-450 exam focuses notably on networking-related issues, reminiscent of domain identify Server (DNS), internet features, file sharing, network client administration, electronic mail features and router configuration. The examination additionally covers protection subject matters like comfy shell (SSH), port testing and configuring OpenVPN.

    LPIC-3: Linux business expert

    The LPIC-3: Linux business expert is the head of the LPI certification program and is considered professional level. for this reason, be sure you have a few years of arms-on experience setting up, managing, integrating, networking and troubleshooting Linux in an business environment.

    To earn your LPIC-three credential, you should obtain LPIC-2 certification as a prerequisite and flow one of these 300-sequence exams:

    mixed environment (exam 300): This examination focuses on OpenLDAP configuration, OpenLDAP as an authentication backend, and totally superior ranges of Samba administration, among different topics.

    safety (examination 303): To pursue this examination, be sure you're smartly versed in entry controls and cryptography, as well as software, operations and community security.

    Virtualization and excessive Availability (exam 304): This exam covers virtualization (of direction), along with load balancing, cluster management and cluster storage.

    you could take the LPIC-2 checks and an LPIC-3 examination in any order. That means that you could knock out the LPIC-3 exam of your choice, then circle lower back and sit down for the LPIC-2 checks.

    LPI Linux essentials

    The Linux essentials knowledgeable development certificates (PDC) is LPI's entry-level certification. It doesn't serve as a prerequisite for the LPIC-1, nonetheless it's a good approach for people who're noticeably new to Linux to start validating their potential. The certificate is really helpful for a variety of business gurus, from developers, to administrators and engineers, and statistics analysts. via gaining knowledge of for and taking the examination, you also benefit certification prep event, which can be a advantage in case you decide to pursue other LPIC certs.

    achieving the Linux necessities PDC shows you are conventional with open supply applications versus closed supply, comprehend the basics of the Linux operating system, and might run commands on the command line, manage files, perform backup and restore operations and write basic scripts.

    Passing a single examination (LPI 010-one hundred fifty) is required to earn the certificates, which does not expire. by means of brand new specifications, the charge is rather low cost, coming in at a mere $one hundred ten, making it pleasing to those drawn to exploring Linux certifications.

    LPI DevOps tools Engineer

    The Linux skilled Institute DevOps tools Engineer credential verifies the knowledge fundamental to make use of tools to allow and enhance collaboration in workflows through the application development and programs administration lifecycle. To create this new credential (introduced in late 2017), LPI surveyed the DevOps “tools landscape” to outline what they call “a set of fundamental tools when making use of DevOps.” This means that the exam zeroes in on functional, day-to-day DevOps talents on the nexus of operations and construction.

    Candidates should possess working competencies of DevOps area together with container and computing device deployment, application engineering and structure, configuration administration and monitoring. They may still even be knowledgeable in such free and open source utilities as Ansible, Docker, Git, Jenkins, Puppet and Vagrant.

    Passing a single examination (LPI 701-one hundred) is required to earn the certification which, like other LPI credentials, lasts 5 years. This ninety-minute exam comprises 60 diverse-choice and fill-in-the-blank questions, and fees $200.

    linked Jobs and practicing supplies

    since the center of attention of LPI Linux certifications, the titanic majority of connected positions are along the strains of system administrators, network administrators, system engineers and technical assist specialist. however you're going to now and again stumble throughout job listings in the hunt for LPI certification for cloud administrator, cybersecurity engineer and technical schooling specialist.

    Some positions peculiarly look for Linux engineers with programming abilities. as an example, one agency turned into trying to find Puppet/Linux engineers to streamline Puppet workflow and aid with implementation and post-implementation guide. a further position known as for an working systems programmer who can design, develop and put into effect new gadget tools, and write scripts in BASH and Python or other administrative scripting languages.

    Linux certification lessons are available through many channels, despite the fact LPI recommends that you simply take courses via one in all its authorised working towards partners (see the accomplice Search page for more details). The LPI Certification industry is a web keep chock-filled with Linux references, certification look at guides, practice tests, courseware, video working towards and apply labs.


    Linux skilled Institute to exchange Linux Certification courses | killexams.com Real Questions and Pass4sure dumps

    Feb 28, 2013

    The Linux expert Institute (LPI), a Linux certification organization, is making adjustments to its LPIC-2 and LPIC-3 certification courses. the brand new ambitions for these certifications are presently beneath building. New exams may be available in English on October 1, 2013 with local translations and pricing to be announced.

    The Linux professional Institute is globally supported via the IT trade, business purchasers, community experts, govt entities and the educational community. LPI's primary fiscal sponsors are platinum sponsors IBM, Linux Journal, Linux journal, Novell, SGI, and TurboLinux as well as gold sponsors, HP and IDG.

    in response to the LPI, it's concentrating on elementary and advanced equipment administration abilities in LPIC-2, whereas further focusing the LPIC-3 software on particular specialties akin to blended environments, safety, and excessive availability/virtualization. The upcoming alterations also reflect LPI's work with the larger open supply community in to confirm the skill sets necessary for quite a few really expert job roles for Linux professionals.

    A revised software roadmap and an outline of proposed adjustments to the LPIC-2 and LPIC-three certification application will also be found here.


    LPI preps skilled-level Linux certification for January 2007 | killexams.com Real Questions and Pass4sure dumps

    The Linux expert Institute is preparing the newest version of its certification check for January, with some support from Novell, which of direction, has a protracted historical past of its personal in certification and training efforts with the venerable certified Novell Engineer application.

    LPI plans to offer the LPI Certification stage 3 (LPIC-three) in January 2007, which should be the optimum degree of Linux certification offered through the neighborhood. LPIC-three is being touted as an commercial enterprise-degree Linux certification, and will require test-takers to have accomplished the LPIC-1 and LPIC-2 certifications to qualify. LPIC-1 is regarded a Junior degree Administrator certification, and requires working expertise of the Linux command line, simple Linux pc and server renovation (backup, fix, shutdown and reboot initiatives) and LAN skills. LPIC-2 , known as Intermediate degree, requires potential of FTP and net servers, firewalls and information superhighway gateways, and mixed-ambiance (windows, Unix and Linux) management.

    LPI says Novell helped shape the LPIC-three as a senior-stage certification, which will contend with larger enterprise technologies and concerns akin to LDAP, Samba and NSF, as well as commercial enterprise means planning, and core network functions planning and troubleshooting.

    LIPC-three become given a beta run in October at a LinuxWorld adventure within the Netherlands, and will debut international next month, with training and educational classes, which lead to the examination. the primary North American LPIC-3 exam will take place at Novell's BrainShare convention in March 2007.

    whereas Novell had its hand in advising on LPIC-three, the LPI says its classes are distro-neutral, and present a generic certification of Linux knowledge and advantage which observe to all flavors of the working system. The LPI says it has certified over 35,000 Linux experts. And the LPIC is no rubber stamp both, because the test has a 35/sixty five flow-fail, ratio, based on the organization.

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    New 2018 Honda CR-V Review: Least powerful diesel, yet, massively impressive! | killexams.com real questions and Pass4sure dumps

    The Honda CR-V tuned out to be quite popular in India after its launch in 2002 in its second generation. Thereafter though, the SUV market changed extensively and large, boxy SUVs with diesel engines became the norm. The CR-V lacked a butch design and most critically a diesel engine, owing to which sales gradually declined. While the model continued to be popular in international markets, in India sales came down to a negligible point, viz-a-viz the competition. The 5th generation CR-V though comes with a diesel engine and loads of new features, which are all aimed at making the vehicle better than ever. Honda Cars India has now decided to launch the new 5th generation Honda CR-V in India on 9th October. They drove the car around the Pink City Jaipur to find out if the CR-V finally has the ammunition to take on the likes of the Toyota Fortuner, Ford Endeavour and Skoda Kodiaq.

    New 2018 Honda CR-V Design

    The first thing one would notice about the design of the new CR-V is the fact that it isn't a rugged-looking and boxy SUV. The CR-V instead is a sophisticated and elegant SUV that would suit an entry at a nice club or an evening party. There is nothing loud about the design and the angular and sleek front with sharp headlamps (with LED DRLs) and a long hood. The front face has got richness in its design and looks thoroughly upmarket. The wide chrome slat in the grille though is something that could have mixed reactions, Most Indians would like it but I would have preferred a little less of the shiny surface.

    Also Read: 2018 Honda CR-V India launch date confirmed: 7-Seater SUV to take on the Toyota Fortuner!

    The story of big and beautiful continues on the side with stunning 18-inch alloy wheels, which not only look great but fill up the flared wheel arches well, lending the SUV a dynamic look. The raked A-pillar along with a roofline that tapers towards the end gives the SUV a sleek profile. At the rear, tail lamps rise to roof where a wide spoiler has been neatly integrated. The rear bumper and tail gate too have subtle lines that match the overall character of the CR-V.

    In the end, people who love vehicles that are elegant and pleasant to look at and aren't brash and intimidating will love the design of the new Honda CR-V and so will most onlookers.

    New 2018 Honda CR-V Engine & gearbox

    Yes, the biggest news in the new Honda CR-V is the inclusion of a diesel engine, finally! The engine though gave rise to some doubts ever since they heard the numbers. A 1.6 litre DOHC, i-DTEC engine develops just 120 hp with a torque output of 300 NM @ 2,000 rpm. Comparing these numbers with the competition instantly makes it clear that on paper the new Honda CR-V is the least powerful SUV in its segment. There's also a 2 litre petrol engine on offer with 154 hp of power and 189 Nm of torque at 4,300 rpm. However, let's face it that this engine isn't going to play a significant role in the score sheet of the new CR-V in India. About 95 % vehicles in this segment are diesel so let's get back to discussing that.

    With doubts in my mind, I thumbed the ignition button and the engine came to life with some clatter and a bit of vibrations. All of this disappeared in seconds and at idle the engine in a moderately noisy ambient environment won't even be audible in the cabin. Starting off, there's no lag from the engine and this is partly due to the new 9-speed AT gearbox. Yes, 9-speed and it's mostly luxury German cars that come with these many ratios. The gearbox does a damn fine job of masking the engine's power deficit and as a result, drivability is excellent. Torque is available in a linear curve and starts to taper off past 4,500 rpm. This means you do not feel the lack of power in city traffic and even n highways while overtaking. It's only when you push the pedal to the metal and try and reach higher triple-digit speeds, the engine starts to run out of steam. That said, the CR-V does a respectable job of moving around in all conditions on their roads. Taking control of the gearbox through the pedal shifters allow you to extract a bit from the diesel mill in case you need to reach somewhere pretty quick or are driving in the hills.

    Another benefit of a smaller displacement engine with a 9-speed gearbox is best-in-segment fuel-efficiency. Honda claims 19.5 kmpl for the diesel variant and 14.4 for the petrol version. They drove both variants and got a system indicated 13.2 kmpl for the diesel version and 9.1 kmpl for the petrol model. While a detailed road test will reveal exact real-world numbers later, these numbers are surely much better than the competition presently.

    The other stellar thing about the diesel engine is the high refinement level and excellent NVH insulation. Even when pushing the engine hard, the diesel clatter doesn't barge into the cabin and instead just filters through. At cruising and urban speed, it's hard to tell at times if this is a diesel engine or a petrol one.

    So there you have it. The diesel engine might not have big numbers to boast of but it surely has excellent drivability and impressive refinement and efficiency. This makes the CR-V a great choice for people who want a comfortable and refined vehicle for themselves and their family.

    New Honda CR-V ride, handling and Off-road

    The 2018 Honda CR-V comes with an All-Wheel Drive (AWD) option in the diesel version. The petrol can only be bought with the front wheels pulling the SUV. Now let me make one thing clear straight away that the CR-V in its AWD version isn't a hardcore off-road SUV. It has mild off-road abilities, which should be good enough to get you out of slightly tricky patches or sail over really bad roads. There is no low-ratio or drive mode so it's just a computer that Honda claims is intelligent and hence can shuffle power between the four wheels with up to a maximum of 40 % going to the rear wheels. They weren't able to test the system's abilities on their short drive but the 208 mm ground clearance surely came in handy while tackling some mild off-road excursions.

    In terms of ride & handling, the new Honda CR-V scores high as it rides almost like a car. Unlike most SUVs in this segment, the CR-V doesn't rock and jolt over surface undulations. Instead, the suspension soaks in most bad roads and ride quality at slow and high speed is simply excellent and comparable to some premium sedans too.

    Going around curves at high speeds isn't what CR-V engineers had on the top of the memo but the vehicle doesn't mind doing the same. There is a bit of body-roll around corners but the CR-V maintains the intended line and is rock solid on straight lines. It will require a fair amount of stupidity to make the CR-V lose control as the SUV does a good job of delivering handling for its positioning.

    New Honda CR-V Interior & Cabin

    The new Honda CR-V has an impressive cabin to greet its occupants. The biggest update is the inclusion of a seven-seat layout, which can be opted for with a diesel version only. Petrol ones come with just five seats. The test vehicle they drove had a seven-seat layout and left us quite impressed. At the front, there's a black dashboard with wood-finish inserts that give a nice subtle contrast to the dark theme. Material quality is nice throughout the cabin and the soft touch top dashboard adds to the premium quotient of the cabin.

    The centre console houses an elegantly integrated colour touch screen that is equipped with Android Auto and Apple CarPlay. The infotainment system also supports navigation, USB and Aux-In connectivity. Apart from offering loads of storage spaces the centre console also has one HDMI output point, a 12 V socket and two USB charging slots. Interestingly, one of these USB slots offers 1.0 A of output while the other offers 1.5 A, which should help charge smartphones and tablets faster. Storage space inside door pockets is ample and easy to access, making the cabin convenient.

    The second row of seats features a 60:40 split with the option of folding down completely to increase boot space. The seats can be pushed backwards and tilted too, thereby enhancing the comfort levels. Legroom is ample and the space under the front seats makes it possible to slide your feet under and relax with almost straight legs. Headroom also is good and taller occupants will find themselves to be comfortable even over long durations.

    Getting to the third-row involves folding the second row of seats on either side and squeezing your way in. Once seated, it becomes clear that this seat is at best suitable for 30 – 45 minutes for an adult. Low seat height means your knees are pointing upwards, resulting in no thigh support. At 5 feet eight inches, my knees were already brushing against the seats in front and shoulder room and backrest angle was also just about ok. While you might think that these seats should be suitable for children, that shouldn't be the case. Please do not have your children sitting in the last row of any vehicle as the risks of fatalities and severe injuries is much higher in the last row, especially in the case of being rear-ended. That said one of the most defining features of the CRV's interiors is the grand panoramic sun-roof which not only adds to airy-ness of the cabin but also adds to the SUVs premium appeal.

    Overall, the new Honda CR-V offers an excellent cabin with high-quality materials, a good set of features and impressive comfort. The inclusion of seven-seats now means that the demand of most consumers in this segment will be met, making a stronger case for sale.

    New 2018 Honda CR-V Conclusion – Who should buy it?

    The new 2018 5th Generation Honda CR-V has finally been able to address two key issues that were hampering its appeal to consumers earlier. With seven-seats and a diesel engine, the CR-V offers a strong and competitive package to prospective SUV buyers. While some might argue that the CR-V doesn't have an aggressive and intimidating design, the success of Hyundai Creta has already made it clear that smart and elegant SUVs too can sell well if the overall package is appealing. The CR-V scores well in the safety department too with six airbags, Hill Start Assist, Lane Watch (blind spot detection), Driver attention monitor and Agile Handle Assist.

    The only missing piece in deciding whether the CR-V as a package is appealing to a buyer or not is the price, which hasn't been revealed yet. The vehicle will be formally launched on 9th October, which is when the prices will be revealed. What they can confirm right now is that the Honda CR-V stands out from its competition in almost all areas and delivers well, especially in the cabin comfort area. It makes a great SUV for people who love to have refined and sophisticated vehicles with class. For people who aren't hell bent on proving a point or shouting out to the world all the time, the Honda CR-V makes perfect sense. It can do most things better than its competitors but its character doesn't scream of its capabilities.

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    Honda Cars India now needs to make sure they do not get carried away with the strength of the vehicle and overprice it as the segment is highly competitive. If you wish to know more about the new 2018 Honda CR-V, their video review will shortly be up on the Express Drives channel on YouTube so please do follow that space.

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    A revolutionary treatment for allergies to peanuts and other foods is going mainstream—but do the benefits outweigh the risks? | killexams.com real questions and Pass4sure dumps

    Jacob Kingsley, 12, visits a bakery that was off-limits before he began oral immunotherapy for a peanut allergy.

    MADDIE MCGARVEY

    Jacob Kingsley was 9 years old when he was handed the poison he'd shunned since before he could walk and told to swallow it as medicine. Obediently, he gulped down a few micrograms of peanut flour—less than 1/1000 of a peanut—diluted in grape Kool-Aid. His mother and a nurse hovered, ready to inject him with epinephrine if an itchy throat and wheezing struck.

    Jacob's mother, Jennifer Kingsley, had driven him 2 hours from their home in Columbus to this doctor's office in Cincinnati, Ohio, for the first of dozens of sessions of peanut immunotherapy. Giving Jacob gradually increasing doses of peanuts, she hoped, would desensitize his immune system.

    It's a strategy Kingsley hadn't pursued until she reached her breaking point. A year earlier, Jacob had swallowed a handful of popcorn that, unbeknownst to him, was laced with peanut product. He suffered a particularly frightening reaction: two bouts of intense symptoms about 6 hours apart. The incident marked his second peanut-related trip to the emergency room, and Kingsley was terrified that the next encounter could be fatal. "I decided, ‘I can't live like this,’" she says. "I was desperate."

    As Jacob sat through the hourslong appointment in Cincinnati, playing video games and swigging increasing doses of peanut-spiked Kool-Aid, he joined legions of children writing food allergy's next chapter. Today, more than 3000 people worldwide, most of them children, have undergone peanut immunotherapy, with the goal of protecting them if they accidentally encounter the food. Other children are trying immunotherapy for allergies to milk, eggs, and tree nuts. Some, like Jacob, get treatment in allergists' offices, where doctors share protocols informally and in published papers. Other children have enrolled in clinical trials, including those run by two companies racing to introduce a peanut-based capsule or skin patch. Both plan to apply for approval from the Food and Drug Administration (FDA) this year. The agency's blessing would dramatically boost immunotherapy's credibility and reach.

    In a field that for decades has had nothing to offer patients beyond avoidance, immunotherapy marks a seismic shift. As it edges closer to mainstream, "There's mixed feelings, with a whole range of enthusiasm," says Corinne Keet, a pediatric allergist-immunologist at Johns Hopkins Medicine in Baltimore, Maryland. Fear that it might cause harm is mingling with euphoria that children living constrained lives could be set free. Doctors who offer immunotherapy describe families eating in Chinese restaurants for the first time and home-schooled children rejoining their peers.

    Like many medical firsts, the therapy is not perfect. "This is version 1.0," says Brian Vickery, a pediatric allergist-immunologist at Emory University in Atlanta. He has conducted peanut immunotherapy trials and worked for 2 years at Aimmune Therapeutics, headquartered in Brisbane, California, one of the companies whose products are nearing approval. Physicians fret about oral immunotherapy's rigors—treatment must continue indefinitely—and its risks, which include the same allergic reactions it aims to prevent. Last year in Japan, a child suffered brain damage during a trial of immunotherapy for milk allergies.

    Meanwhile, physicians on the front lines are navigating hazy science. No one knows exactly how immunotherapy works or who's most likely to be helped or hurt by it. "For me," Keet says, "it's really not clear for an average child with peanut allergy whether it will make sense to do oral immunotherapy or not."

    Like many who study food allergies, Keet was enticed by their mystery. Animal models are poor. The intensity of allergic reactions varies unpredictably, even in the same person over time. Why one child outgrows an allergy and another doesn't is unknown.

    "This was something they didn't cover much in medical school" in the 1990s, says Matthew Greenhawt, a pediatric allergist-immunologist at Children's Hospital Colorado in Denver. Greenhawt's career trajectory tracks with a surge in food allergies, and these days, he can barely keep up with the stream of affected children who visit his hospital. Today, between 1% and 2% of people in the United States, the United Kingdom, and several other countries are allergic to peanuts—a rate that has roughly tripled since the mid-1990s. Other food allergies, such as those to tree nuts, are also on the rise. What's causing the increase is not well understood.

    Despite rising caseloads, deaths from food allergies remain rare. Precise numbers are hard to come by, and estimates range from fewer than 10 to more than 150 a year in the United States. But even though an affected child is more likely to be struck by lightning than to die of a food allergy, the risk can feel ever-present. Parents never know when their children will happen upon culprit foods and how they'll be affected if they do. "We live in a complex world—people move food all over the place," says David Bunning, a businessman whose two sons, now adults, have multiple food allergies. "The impact on children in terms of their confidence to explore their environment can be extreme." Bunning's family almost never traveled or ate out. At their grandparents' house, the boys were usually confined to one room where food wasn't allowed.

    Bunning now chairs the board of directors at Food Allergy Research & Education (FARE), an advocacy group in McLean, Virginia. Families like his, and the doctors who cared for their children, began to agitate for new treatments about a decade ago. Immunotherapy was the obvious candidate: Injections that desensitize the immune system to pollen, grass, pet dander, and bee venom have been around for decades.

    Whether for an allergy to cats or pistachios, immunotherapy aims to disrupt the cells that swing out of control when faced with an allergen. When a child who is allergic to a food eats it, food proteins cross from the digestive tract into the bloodstream. An antibody called immunoglobulin E (IgE), which is bound to white blood cells called mast cells in tissues, recognizes the culprits. IgE activates the mast cells, which release histamine and other chemicals. In the skin, that response can lead to hives; in the respiratory tract, wheezing; and in the gut, vomiting. The most serious symptoms, such as a swollen throat or a reaction throughout the body, mark anaphylaxis, which is what families fear the most. Allergy shots blunt production of IgE, in part, researchers believe, by boosting levels of certain T cells that prompt a cascade of immune changes.

    Peanuts Fighting fire with fire Eating gradually increasing doses of a foodallergen seems to desensitize the immune system over time. Thousands of children have tried oral immunotherapy, and a capsule to treat peanut allergies might be approved by regulators next year. But there’s anxiety about the strategy’s risks and unknowns. When a child eats a food they’re allergic to, an antibody called immunoglobulin E (IgE) helps touch off events that lead to symp-toms from mild to severe. Symptoms can hit the skin, as shown, and also the gut, the respiratory system, and beyond. Food proteins that trigger a reaction pass through the gut and into the bloodstream. Red bloodcell One symptom: skin hives Ingestion ofcontrolledallergen dose The level of IgE in the blood can drop. Less reactive mast cell Milder reactions on the skin and beyond. Less food protein goes into the bloodstream. What’s an allergic reaction? Months of oral immunotherapy make mast cells less reactive and seem to reduce how much allergen enters the bloodstream. Many children can tolerate more of the food they’re allergic to but must continue treatment indefinitely. About 20% discontinue treatment because of side effects and other reasons. How does treatment work? Reactions include hives, itchy throat, vomiting, and difficulty breathing. Allergy symptoms Hives Wheezing Rapid heartrate Vomiting IgE, which binds to mast cells, alerts these white blood cells. They releasehistamine and other chemicals. Mast cells Immunotherapy leads to more of the IgG4 antibody, which is thought to compete with IgE and prevent mast cells from being activated. IgG4 Scientists think the body produces more of this antibody, which makes it harder for the allergen to pass from the gut into the bloodstream. IgA Children with food allergies have high levels of an antibody, IgE, that recognizes specific allergens. IgE Mast cell membrane Allergen IgE

    C. BICKEL/SCIENCE

    Brief testing decades ago indicated that shots for food allergies weren't safe. So around the mid-2000s, scientists began to feed children the allergen instead. One watershed moment came in 2005, when the National Institutes of Health formed a consortium for food allergy clinical trials. A second was in 2011, when advocates sponsored a symposium at Harvard Medical School in Boston to standardize goals and strategy for the pioneering immunotherapy efforts. About 60 people attended. "The patients were very clear," says Carla McGuire Davis, a pediatric allergist-immunologist at Texas Children's Hospital in Houston. They didn't care about eating a peanut butter sandwich; they wanted protection if they accidentally encountered one. Trialists set their end dose at a couple of peanuts and pressed ahead.

    The results of early clinical trials were promising, says Hugh Sampson, a pediatric allergist-immunologist at the Icahn School of Medicine at Mount Sinai in New York City, who has studied immunotherapy in food allergies for many years. After 6 to 12 months of treatment, he says, about 70% to 80% of patients could handle higher doses of the food than before. Lab data were encouraging, too: Ingesting allergens over time seems to make mast cells less reactive, inhibiting their release of harmful chemicals. The therapy also produces other immunoglobulins: IgG4, which further inhibits mast cell activity, and IgA, which helps keep food allergens from escaping the gut.

    The 2011 conference inspired the founding of the company now called Aimmune, fueled by more than $3.5 million from FARE. A second company, DBV Technologies, based in Montrouge, France, and New York City, expanded a few years later. Aimmune began to develop an oral product, essentially a capsule of powder derived from peanut flour with proteins held to consistent levels. In February, the company announced in a press release the results of a phase III trial involving 496 children and teenagers, with a regimen stepping up every 2 weeks through 11 dose levels. Among the 372 people in the treatment group, about 20% dropped out for various reasons, including side effects. After about a year, 96% of people who completed treatment could consume one peanut with no more than mild symptoms, 84% could tolerate two, and 63% could tolerate at least three.

    DBV's skin patch represents a more conservative strategy: It delivers tiny amounts of peanut protein, the equivalent of one peanut over 3 years. Last year, DBV announced that in its phase III trial of almost 400 patients, after a year, those using the patch could, on average, eat three peanuts over the course of several hours before experiencing clinical symptoms such as vomiting or hives; before the trial, the average was just under one peanut. Outcomes varied substantially from person to person.

    If one or both products are approved by FDA in the coming months, expectations are high that they'll be welcomed: Aimmune is now worth about $1.5 billion on the U.S. stock exchange. In 2016, FARE sold its share in Aimmune for $47 million.

    What people don’t understand is this level of protection fluctuates. … It is not guaranteed, nor is it constant.

    Mimi Tang, Murdoch Children’s Research Institute

    Meanwhile, some doctors embrace another route: offering peanut immunotherapy in their practices. "I can treat 20 patients with $5.95 of peanut flour," says Richard L. Wasserman, a pediatric allergist-immunologist in Dallas, Texas.

    Wasserman ventured into food allergy immunotherapy 11 years ago. He developed a protocol based partly on published case reports and protocols for allergy shots, and he put IVs into his first five peanut allergy patients in case he had only seconds to rescue them from severe anaphylaxis. "When they all sailed through the first day, they stopped doing IVs," he says. "But that's a measure of how concerned I was."

    Wasserman has since treated more than 300 children with peanut allergies and more than 400 with other food allergies. Other practitioners are joining in, among them the Cincinnati allergist whom the Kingsley family sought out: Justin Greiwe at Bernstein Allergy Group. Greiwe joined the practice in 2014, straight out of medical training. "It was a little nerve-wracking at the beginning," he says, because no officially sanctioned oral immunotherapy protocol existed. He took precautionary measures, such as lung testing before every treatment, to help ensure patient safety.

    Some clinicians—and executives at the companies developing products—aren't happy about the doctor's office treatments. "That gives a lot of us pause," says Sampson, who in addition to his academic post is chief scientific officer of DBV. "We're very afraid that if this goes on enough, somebody is going to have an accident or a fatal reaction, and that's really going to change the FDA's viewpoint" about the products in development, he says.

    Wasserman agrees about the need for caution. "Not every practicing allergist should be doing oral immunotherapy," he says. Greiwe suggests the treatment requires a dedicated staff, and he gives every immunotherapy family his cellphone number.

    Jacob was one of Greiwe's first immunotherapy patients. His mother remembers Jacob's ears burning—a minor reaction that subsided on its own. "Or he said he hated peanuts and wanted to quit," she says. Worst was about 6 months in, when Kingsley discovered that for 2 weeks, Jacob had hidden his dose to avoid eating it. That was "the only time they ever felt danger," she says. Stopping treatment can quickly alter the immune system, says Cecilia Berin, an immunologist at Mount Sinai, because immunotherapy requires constant exposure. When Jacob squirreled away his daily dose, the changes induced in his immune system almost certainly started to fade out, putting him at risk. Greiwe restarted him on a lower dose and, his mother says, "We got through it."

    Food allergies are becoming more common, and a handful of foods accounts for the vast majority of allergies. But small doses of the foods can blunt allergic reactions.

    SCIENCE PHOTO LIBRARY/SCIENCE SOURCE

    Even children who faithfully follow instructions face risks. The immune system can react to even subtle pressures, and the list of what can provoke a reaction to treatment is long. Exercising within a couple of hours of the dose can do it; so can a cold, a stomach virus, menstruation, or a hot shower. An asthma attack can trigger a reaction—many children with allergies have asthma as well—and so can stress. "We had a patient who had just played the violin on a stage, came down, and about 15 minutes later … took the dose and had a reaction," Davis says.

    Berin posits that external pressures such as physical activity or illness make the gut more permeable, pushing more of the immunotherapy dose into the bloodstream. But that remains hypothesis. Regardless, it's becoming clear that "there are people who react years down the road to a maintenance dose," Keet says. For Jacob, such a moment came 9 months in. One evening while watching a movie, he downed his peanut M&M's and later ran outside with his cousins to dance in a rainstorm. He broke out in hives head to toe. Kingsley dialed Greiwe's number, and Jacob got a double dose of an allergy medication.

    The most tragic data point to date is the case in Japan. A child had enrolled in a trial of immunotherapy for milk allergies at the Kanagawa Children's Medical Center in Yokohama. He'd raised what he could ingest from less than 8 milliliters to 135 milliliters—about half a glass of milk. After 3 months on that maintenance dose, he swallowed it and soon complained of pain. Within minutes, he had stopped breathing. His heartbeat was later restored in the emergency room, but he'd gone too long without it and sustained severe brain damage, according to a statement from the hospital's president, Sumimasa Yamashita, in November 2017. Kanagawa Children's Medical Center declined to comment, saying only that the incident remains under investigation.

    In its statement, the hospital noted the boy had suffered an asthma attack the day before the catastrophic dose. He also was on a protocol that aimed to rapidly escalate the volume of milk he could drink over less than 3 weeks. But why the child reacted so disastrously to that glass of milk is unknown.

    "What people don't understand is this level of protection fluctuates," says Mimi Tang, a pediatric allergist-immunologist at Murdoch Children's Research Institute in Melbourne, Australia. "It is not guaranteed, nor is it constant."

    One of the few long-term analyses was published in 2013 in The Journal of Allergy and Clinical Immunology. Keet, pediatric allergist-immunologist Robert Wood at Johns Hopkins Medicine, and their colleagues sought out 32 children who'd been in a milk immunotherapy trial. Three to 5 years later, "The results were surprising in a sobering kind of way," Wood says. Only about a quarter "were doing great … tolerating unlimited quantities of milk without side effects." Another quarter had abandoned the protocol and returned to strict avoidance. The rest were eating dairy products inconsistently, with intermittent or even frequent allergic reactions. "It's hard to know which comes first, whether they got complacent" about ingesting it "or backed off because [they were] having too many symptoms," Wood says.

    It made me nervous, really nervous, to put something in my daughter’s mouth that she was allergic to.

    Divya Balachandar, mother of Leena Wong

    More and more families are willing to live with those uncertainties because the alternative is greater anxiety. "We were scared senseless," says Divya Balachandar, whose daughter Leena Wong, now 7 years old, had her first episode of anaphylaxis at age 4 after being touched by a cashew. Testing revealed Leena also was allergic to sesame, eggs, milk, other tree nuts, and peanuts. Balachandar, a pediatric pulmonologist in New York City, and her husband enrolled Leena in a federally funded oral immunotherapy trial for peanut allergy in 2015. "It made me nervous, really nervous, to put something in my daughter's mouth that she was allergic to," Balachandar says. She gravitated toward a trial over treatment with a local allergist because, she says, "there were no rules" about how to treat in private practice. By this spring, Leena could eat two spoonfuls of peanut butter—about 25 peanuts—without a problem. She started second grade sitting with her classmates at lunchtime, liberated from a separate nut-free table.

    Both companies developing peanut-based treatments say they had more volunteers for their trials than they could accommodate. Private practitioners usually have a waiting list; Greiwe's runs more than 4 months. At Stanford University in Palo Alto, California, which has a large food allergy research program, more than 2000 patients are waitlisted to enroll in the university's clinical trials, says Sharon Chinthrajah, an allergist-immunologist there.

    More treatments are on the horizon. In Australia, Tang is working with a company that's testing an approach she pioneered, a combination of a probiotic and oral peanut immunotherapy. The probiotic should tilt the body toward producing the subset of T cells that tolerate the allergen and away from making cells that attack it, she says. Chinthrajah and others are enthusiastic about combining oral immunotherapy with a monoclonal antibody called omalizumab, which is FDA approved to treat allergic asthma. Clinical trials are also gearing up to test other monoclonal antibodies that target molecules involved in allergic inflammation.

    Jacob's and Leena's families are eager to see what comes next. Jacob is also allergic to pistachios and cashews, but because he finds those foods easier to avoid than peanuts, the family has rejected immunotherapy that targets them. Leena's family is the opposite. With her older sister and her parents, Leena attends Indian functions regularly, where tree nuts are a common ingredient in sauces. In August, another episode of anaphylaxis landed her in the emergency room: She began to vomit and suffered chest tightness and eye swelling after eating Indian food her parents suspect contained cashews—despite having triple-checked with the restaurant that it did not. "I would love to do tree nuts," Balachandar says, once immunotherapy "becomes more available and better understood."

    Physicians with deep roots in food allergy immunotherapy hope those new to it tread carefully. Doctors who offer such treatments "have to know the data cold," including published results and side effects that may crop up, Greenhawt says. Still, he's thrilled that peanut immunotherapy treatments may soon be approved. The other day, talking with a peanut-allergic 4-year-old and his mother, Greenhawt shared what the next year might bring. "I said, ‘I'm going to see you a year from now; hopefully, they will have two products that are approved, and they can talk about which one might be best for you.’" The mother looked startled and delighted, Greenhawt says. "I've never seen somebody smile as brightly as that."


    A mouse tissue transcription factor atlas | killexams.com real questions and Pass4sure dumps

    Deep TF DNA-binding activity profiling of mouse tissues

    We profiled the TF DNA-binding activities from 32 histologically normal mouse tissues, including 24 adult tissues and 8 fetal or reproduction-related tissues, to obtain a panoramic view of TF activity in mouse tissues (Fig. 1a). Endogenous TFs were enriched by the catTFRE approach20 and fractionated by sodium dodecyl sulfate (SDS)–polyacrylamide gel electrophoresis. The tryptic peptides were analysed on high-resolution Orbitrap MS instruments (Orbitrap Q-Exactive) (Fig. 1b, Supplementary Fig. 1a,b). They measured 3–7 biological replicates from the 24 adult tissues until they obtained at least three measurements that showed a correlation coefficient of R>0.8 (Supplementary Fig. 1c). One or two biological repeats for the fetal or reproduction-related tissues were performed (Supplementary Fig. 1d). A website ‘Mouse TF Atlas’ was developed to host the data (www.tfatlas.org) (Fig. 1c).

    Figure 1: Overview of the mouse tissue TF atlas workflow. Figure 1

    (a) The 24 adult mouse tissues and 8 fetal tissues analysed to generate a draft map of the mouse TF atlas are shown. The same font colour indicates that the tissues are from the same physiological system. The ambient arcs show the layers from which the tissues developed. Red: ectoderm; Blue: mesoderm; Brown: endoderm. (b) Nuclear extract (NE) were prepared from each tissue, and then the catTFRE pull down was carried out and analysed by LC-MS/MS to obtain the primary data. (See the Methods section for details). (c) The data were analysed with a homemade platform and stored in the mouse TF atlas database. (See the Methods section for details).

    Aided by annotation in the DBD database (http://dbd.mrc-lmb.cam.ac.uk/DBD), they could assign 941 of the identified proteins as TFs, representing 60% of the genes encoding TFs. In the adult and fetal tissues, 907 and 587 TFs were identified, respectively; among them, 354 and 34 TFs were unique to the adult tissues and fetal tissues, respectively (Supplementary Fig. 1e and Supplementary Data 1).

    All DNA-binding transcription factor (DBTF) families annotated in the DBD database were recovered in their data set. Notably, components of the TF families belonging to AT hook, TDP, RFX, IRF, STAT, SAND, CP2 and AP2 were all detected, and the ZNF-GATA, NR, IPT/TIG, DM and MADs-box families achieved deep coverage, with only one or two components missing. In contrast, approximately 40% and 78% of the ZNF-C2H2 and homeodomain family members, respectively, were detected (Fig. 2a; Supplementary Data 1).

    Figure 2: TF identifications in 24 adult and 8 fetal mouse tissues. Figure 2

    (a) Number of TFs identified in each TF family. The TFs were classified into families according to their DNA-binding domains. TFs with multiple DBDs were classified in each of their respective families. The number of TFs in each family that was detected using the catTFRE strategy is plotted. (b) Heatmap of TF DNA-binding activity in 24 adult mouse tissues and 8 fetal tissues; the TFs are shown in the rows, and the tissues are shown in the columns. DBA: DNA-binding activity. (c) Cumulative protein abundance from the highest to lowest in the 24 adult tissues. (d) Number of tissues in which the TFs are expressed. (e) Heatmap for non-ubiquitous (71.3%), ubiquitous-uniform (3.1%) or ubiquitous non-uniform (25.6%) TF. The colour bar on the right indicates the relative expression abundance. (f) The number of tissue restricted TFs (ttrTFs) and their fractions in total TFs in different tissues. (g) Distributions of ubiquitous and ttrTFs and their relative abundances in 24 adult tissues. The abundance of the TFs spans almost seven orders of magnitude. The names of the top three most abundant TFs are listed.

    The number of TFs identified in each tissue varied, ranging from 173 in skeletal muscle to 448 in thymus (Fig. 2b). They used FOT (fraction of total), the portion of TF expression in all detected TFs in a particular tissue, as an indicator of TF abundance. They found that the most abundant TF in each tissue accounted for at least 10% of the total TF abundance and that the 4 most abundant TFs accounted for >30% of the TF abundance in the corresponding tissue. This phenomenon was most profound in intestine, spinal cord, seminal vesicle and lung; for instance, Hmgb2 represented over 60% of the total TF abundance in small intestine, and Tfam accounted more than half of the total TF abundance of spinal cord, seminal vesicle and lung (Fig. 2c and Supplementary Data 1).

    Geiger and colleagues reported a proteome profiling of 28 mouse tissues21. When compared with the proteome profiling data set, the catTFRE showed a clear advantage in enriching endogenous TFs with the identification of 941 compared to 151 identified by proteome profiling (Supplementary Fig. 1e). Correlation analysis of the overlapping TFs in the 13 tissues in both data sets showed that the Spearman’s rank correlation coefficient ranged from 0.046 (liver) to 0.401 (spleen), revealing a difference between TF expression levels and their DNA-binding activities.

    We mined hundreds of published literatures (Supplementary Data 1) to construct a library for well-characterized TFs in the 13 overlapped tissues. As shown in Supplementary Data 1, the catTFRE successfully detected most of these TFs in tissues (76 out of 85), while profiling only identified few of them (6 out of 85).

    Transcriptional co-regulators (TCs) play critical roles in transcriptional regulation by interacting and cooperating with the TFs. The catTFRE data set also contained 523 TCs (Supplementary Data 1). An L-shaped distribution pattern was observed among the 32 tissues (Supplementary Fig. 2a). Interestingly, TCs in general showed lower tissue-specificity scores (TSPS)22, the relative entropy to evaluate the distance between the observed TF expression pattern and the uniform expression pattern across all tissues, than TFs (P value=3.86E-16), suggesting their more uniform distribution and essential functions in the whole body (Supplementary Fig. 2b,c).

    Ubiquitous and tissue-restricted DBTFs in mouse tissues

    To investigate the TF expression patterns in different tissues, they plotted the number of TFs that were detected in different tissues and found that less than 32% of the total number of TFs were detected in more than 12 tissues (half of 24 adult tissues) (Fig. 2d).We calculated the median and maximum FOT values in all tissues where they were detected and used them to perform a density plot analysis of the TF expression patterns across the 24 adult tissues. This analysis stratified the TFs into three categories: non-ubiquitous TFs (non-ubiTFs, 640 TFs, accounting for 71.3% of the identified TFs), which were highly expressed in only a few tissues with a transformed median expression value of <0.5; ubiquitous TFs (ubiTFs, 257 TFs, 28.7%), which were expressed in a wide variety of tissues with a transformed median expression value of >0.5. Among them, the expression of 27 TFs exhibited a maximum value of less than ten times the median value, indicating a ubiquitous-uniform distribution (27 TFs, 3.1%); the rest of the TFs can be classified as ubiquitous-non-uniform (230 TFs, 25.6%), with a maximum expression value exceeding ten times the medium value (Fig. 2e, Supplementary Fig. 2d and Supplementary Data 2). Consistent with their wide distribution, the ubiquitous-non-uniform TFs mainly function in generic biological processes, such as circadian rhythms, cell cycle, cell growth and chromatin remodelling.

    We define TFs that are expressed in a tissue at levels that are at least ten times higher than the median value of all adult tissues as tissue type restricted TFs (ttrTFs). The extreme case is the tissue-specific TF, which is expressed only in one tissue. A large number of ttrTFs were identified in the central nervous system, the immune system (thymus), and the reproductive system (testis), whereas a smaller number of ttrTFs were identified in the metabolic system (intestine, liver, stomach and adipocytes) (Fig. 2f,g). The TF specificity in adult tissues was further validated by qPCR (Supplementary Fig. 2e and Supplementary Data 2). Importantly, TF specificity at the mRNA levels is largely consistent with their DNA-binding activities.

    Transcription network of the NRs and other TF families

    Studies on the mRNA expression profile of TFs offered a simple and powerful way to obtain highly relational information regarding the physiological functions of the individual proteins and the protein families. One of the most successful examples is the anatomical profiling of NRs by the Nuclear Receptor Signaling Atlas (NURSA) organization23,24,25. The mRNA profiling of NRs defined a ring of NR physiology, dividing the NR regulatory network along two physiological paradigms: (1) reproduction, development and growth; and (2) nutrient uptake, metabolism and excretion. These studies reveal a transcriptional circuitry that extends beyond individual tissues to form a mega network governing physiology on an organismal scale.

    Here, they were able to reliably detect 47 of the 49 NRs from 32 mouse tissues, with the exception of Nr1h5 and ESR2 (Fig. 3a). Among them, 7 NRs were expressed in all tissues (not including blood), 10 NRs were expressed in more than half of but not all tissues and 30 NRs were restricted to less than 50% of the tissues (Fig. 3b, Supplementary Fig. 3a and Supplementary Data 3). While Nr1h5 mRNA expression was detected at very low levels in three tissues23, TFRE-bound Nr1h5 was detected in one experiment in mouse liver TFRE experiment and ESR2 in one mouse embryonic fibroblast (MEF) TFRE experiment with transfected over-expression of Hnf1a, Pdx1 and Bhlha15.

    Figure 3: Global profiling of TF families in mouse tissues. Figure 3

    (a) Unsupervised hierarchical clustering of DNA-binding activities of nuclear receptors (NRs) and the comparison with mRNA expressions. NRs were grouped into two main clusters (I and II) and five sub-clusters (IA, IB, IC, IIA and IIB). The comparison with mRNA is shown on the right colour block. (b) Statistics of NR expressions in different tissues. The number of NRs expressed in various tissues is indicated in the pie chart. Seven NRs were expressed in all tissues, ten NRs were expressed in more than half of but not all tissues and were labelled ‘widespread’, and 30 NRs were restricted to less than 50% of tissues and were named ‘restricted’. (c) The ‘NR Ring of Physiology’ derived from DNA-binding activity. The dendrogram is depicted based on the hierarchical clustering, revealing NR clusters in different tissues. (d) Unsupervised hierarchical clustering of other TF families. Blocks with different colours represent different physiological systems. The annotations in the blocks are the GO enrichment terms for the TGs that were co-regulated by at least two TFs in the block.

    Unsupervised hierarchical clustering of the NR DNA-binding activity revealed two major clusters, which can be further divided into five sub-clusters (Fig. 3a). Cluster IC mainly includes (sex)-steroid hormone receptors, such as AR, ER, PR and DAX-1. Cluster IB includes NRs that are ubiquitously expressed in adult tissues and are expressed at low levels in embryos. Cluster IIB NRs are predominantly expressed in the digestive system, whereas the NRs in Cluster IB have a more widespread expression in different tissues.

    In general, their clusters are consistent with the previous one derived from the mRNA profiling23 but show some differences (Fig. 3a). Esrra/ERRa, Nr2c1/TR2, Nr2f6/EAR2 and Nr6a1/GCNF, which were once classified in Cluster lipid metabolism and energy hemostasis, are now classified in Cluster I as ubiquitous NRs and reproduction; Nr1h2/LXRb and Nr3c2/MR that were once classified in Cluster central nervous system and circadian function are now classified in Clusters IIA and IIB in the digestive system. The current classification is consistent with their functions that were uncovered in more recent studies. For example, Nr1h2 regulates genes involved in liver metabolism and cholesterol uptake26,27, and Nr6a1 plays an important role in germ cell development during gametogenesis28. Nr2c1 and Nr2c2 form the direct repeat erythroid definitive complex, which plays a fundamental role in early embryogenesis and embryonic stem cell proliferation29. Notably, these two NRs were classified to the same cluster but were divided into two groups based on the transcriptome data. A modified version of ‘The Nuclear Receptor Ring of Physiology’24 is illustrated in Fig. 3c. A minor difference in classification between current and previously proposed one revealed the diverse and complementary information provided by TF DNA-binding activity at protein level and gene expression at mRNA level.

    Other TF families can be similarly analysed to uncover the ‘Ring of Physiology’. For instance, a cluster of the Fox family (Foxa1, Foxa2, Foxa3 and Foxf1) was enriched in the digestive system; another cluster of the Hmg family (Sox4, Sox14, Hmga2, Sox2, Sox1 and Hmgn3) was predominantly expressed in the nervous system (Fig. 3d and Supplementary Fig. 3b). The propensities of TF families in different tissues suggested a connection between TF DNA-binding domains and biological functions (Supplementary Data 3).

    Illuminating the dark proteome of TFs

    We investigated the co-expression of TFs in 24 adult tissues using TFs that were expressed in more than four tissues. Using Pearson correlation coefficient of 0.4 as a cutoff to define a positive correlation between TF pairs30, they obtained 37 tightly related TF modules that showed excellent co-expression patterns (Fig. 4a and Supplementary Data 4).We summed the average intensity of each module and then performed hierarchical clustering to reveal the relationship among the 37 TF modules. These modules segregate into six distinct clusters (Fig. 4b). Their Gene Ontology (GO)31 term enrichments revealed their potential functions (Fig. 4c) and connections with tissue distribution patterns. For instance, many TFs in the Cluster I predominantly function in oxidation-reduction and vitamin/steroid/lipid metabolism and are highly enriched in liver, colon and small intestine. Functions of unknown proteins may be inferred by the known functions of other members of the module, thereby shedding light on the ‘dark proteome’. Twenty-two out of the 37 modules appeared to have functional enrichment, and predicted functions of 131 of the 156 TFs matched their functions revealed by the previous publications. For example, the Module #1 contains six TFs that are mainly expressed in tongue and skin, was related to muscle contraction and keratinocyte differentiation. Functional roles for Module #5 proteins Tead2, Bach1, Notch3 and Dlx5 in the nervous system have reported; this suggests that the other member of Module 5, Fosl2, may have the similar function.

    Figure 4: The DBTF co-expression network. Figure 4

    (a) Co-expression blocks of TFs. Thirty-seven co-expression blocks of TFs were identified in 24 adult organs. Pearson’s correlation coefficient of 0.4 was used as a cutoff, and Kendall’s Tau test was applied to test for significance. (b) Unsupervised hierarchical clustering of the 37 co-expression modules. Six clusters were grouped according to their different tissue distribution patterns. (c) GO term enrichments and tissue distributions of the six clusters derived from the 37 co-expression modules. (d) Details of Module #12. The correlation coefficients between the TFs in Module #12 are listed in the table. (e) GSEA terms of Zfp655 suggest Zfp655 functions in metabolism and immunity.

    Similarly, Zfp655 in Module #12 was tightly co-expressed with Hnf1a, Hnf1b, Hnf4a and Nr1h4, all of which play important roles in liver (Fig. 4d). This finding suggested that Zfp655, whose function is unknown, may play important roles in liver function. They next identified genes with mRNA expression pattern similar to the Zfp655 DNA-binding activity pattern in the 23 tissues and carried out gene set enrichment analysis (GSEA). The GSEA terms indicated that Zfp655 was positively associated with both metabolism-related pathways and the immune processes (Fig. 4e), consistent with the functions of Hnf1a/b, Hnf4a and Nr1h4 (ref. 32) (Supplementary Fig. 4a,b).

    We also found tightly co-expressed TF pairs, for example, Clock/Arntl (Bmal1), which form a core component of the circadian clock and are widely expressed in several tissues, particularly in circadian tissues33, with a correlation coefficient was 0.92. Mef2 and Bhlha15 (Mist1) have been reported to play diverse roles in skeletal and cardiac muscle. Mist1 mainly represses MyoD34, a major TF that regulates muscle differentiation, whereas Mef2a and MyoD can cooperatively activate muscle genes35. In their study, Mist1 and Mef2a expression had a negative correlation coefficient of 0.70. Consistently, Mist1 has been reported to be an important Xbp1 target gene (TG) that inhibits muscle differentiation36, and Xbp1 was negatively correlated with Mef2a (−0.68) (Supplementary Fig. 4c). These positive/negative correlations confirmed the collaborative/antagonistic relations of the TFs in biological processes.

    Combinatorial TF network in mouse tissues

    Combinatorial TF interactions are critical for cellular functions and are important determinants of different cell types. The TF interaction network constructed from protein–protein interaction assays, such as the mammalian and yeast two hybrid assay22,37, have revealed many important regulatory features of TFs. One limitation of such heterologous assays is that the over-expressed proteins may or may not be co-expressed in the same cells. TF atlas allows us to survey the combinatorial TF interactions among different tissues from the perspective of endogenously expressed proteins.

    We re-analysed the TF interaction network of the 24 adult tissues by matching differential TF expression patterns to the TF network map22 (Fig. 5a and Supplementary Data 5). Similar to the tissue specificity of TF expression, TF–TF interactions exhibited an L-shaped distribution among tissues (Fig. 5b). Thus, 764 tissue-restricted TF–TF interactions were identified in no more than 12 tissues, and 252 ubiquitous TF–TF interactions were identified in more than 12 tissues (Supplementary Data 5).

    Figure 5: TF interaction network and specific TF expression patterns in physiological systems in mouse tissues. Figure 5

    (a) Interaction network of all TFs in the 24 tissues. The colours indicate the tissue-specificity score (TSPS), and the node size shows the number of PPIs of the TF. (b) The numbers of TF–TF interactions that were detected in different number of tissues. More than 150 TF–TF interactions were detected in one tissue and only 11 TF–TF interactions were detected in all 24 tissues. (c) The negative correlation between tissue specificity and the number of TF–TF connections. The TFs were binned into five groups of approximately equal size based on tissue specificity (x axis). The stacks of coloured segments represent the number of interactions for each bin. (d) Statistical significance of different types of protein–protein interaction, calculated using 1,000-time permutation test. Centre line and box limits represent median value and lower or upper quartile, respectively. Whiskers show the range of lower quartile −1.5-fold IQR to higher quartile +1.5-fold IQR. (e) TF interactions between Meis1 and Homobox TFs in different tissues. As a facilitator hub, Meis1 interacts with different TFs in the Hox family in different tissues, showing the specificity of the interaction was determined by Homobox TFs, namely the ttr TFs. (f) Heat map showing the pairwise correlations between all 24 adult tissues based on DNA-binding ability. The TF expression patterns are similar between tissues of the same physiological systems. (g) Clustering of the top 30 most enriched TFs in the ten physiological systems to identify TFs that can specify the biological systems.

    Ubiquitous TFs, such as Jun, Smad3 and Rxra, were involved in large number of TF–TF interactions implying that they are involved in wide variety of cellular transcriptional programs through protein–protein interactions. In contrast, ttrTFs, such as Nr1h4, Irf4 and Ptf1a, have fewer interaction partners, suggesting these TFs may function in tissue-restricted processes (Supplementary Fig. 5a). The positive correlation between number of tissues expressed and the number of TF–TF connections was significant (Fig. 5c).

    Interactions between ubiquitous TFs and not ubiquitous TFs were widely observed throughout TF network, which occurred more frequently than expected and were higher than interactions within each groups (ubiTFs–ubiTFs, non-ubiTFs–non-ubiTFs) (Fig. 5d). As exemplified by the connection between Meis1 and Homobox the ubiquitous TF Meis1 was expressed in 23 out of 24 adult tissues and has the potential to connect to 15 ttr-Homobox TFs (Fig. 5e). The specificity of the interaction between Meis1 and Homobox TFs appeared to be determined by the specificity of the Homobox TF. Thus, TF–TF interactions are more conserved among tissues than the TFs themselves. A signature TF networks of each tissue type were also constructed (Supplementary Fig. 5b), and TFs that were expressed in multiple tissues formed different sub-TF networks. For example, Hnf4a interacted with Smad, Hnf1a and Nr2c2 in the stomach, small intestine and colon, whereas it was also connected to Esr1 in the liver, white adipose tissue (WAT) and kidney (Supplementary Fig. 5c).

    Our analysis also revealed similar TF expression patterns between adjacent tissues in the nervous system (brain, eyes and spinal cord), digestive system (stomach, colon, intestine and liver), adipose tissue (brown adipose tissue (BAT) and WAT) and immune system (thymus, spleen and blood) (Fig. 5f). They identified top 30 differentially expressed TFs for each of the ten physiological systems (Figs 1a, 5g and Supplementary Data 5) and analysed their downstream TG. Their results revealed that they were significantly enriched in the predominant biological processes of the corresponding systems (Supplementary Fig. 5d).

    TFs that maintain the tissue identity

    We sought to identify TFs that may be required to maintain the identities of the tissue types (tissue-type-maintenance transcription factor (ttmTFs)). They reasoned that ttmTFs should not only be specifically enriched in the tissue but should also dominantly control the transcription of their downstream genes in that tissue. They gathered the mRNA expression data from publically available RNA microarray studies and employed TF-downstream TG data from CellNET38,39. A total of 286 ttmTFs were identified in 21 adult tissues, ranging from 62 in thymus and 4 in pancreas, and none in thyroid and seminal vesicle (Fig. 6a,b, Supplementary Fig. 6 and Supplementary Data 6).

    Figure 6: Identification of tissue-type maintenance transcription factors (ttmTFs) and their fundamental features. Figure 6

    (a) ttmTFs for each tissue are identified with high Z-scores (>1) and TG Z-scores that are higher than those from random data. x axis represents the number of target genes; y axis represents the average TG Z-scores. Network of TFs with a three-tiered organization was shown on the right. (b) The number of identified ttmTFs in the 24 adult tissues. (c) Heat map for the Reactome terms that were enriched in the TGs that were regulated by at least two ttmTFs in each adult tissue. (d) PCA demonstrated that the ttmTFs exhibited the highest accuracy in separating the tissues from the ectoderm, mesoderm and endoderm lineages. Plus signs indicate the cluster centroids. The radius of the circle indicates the average distance from the centroid. The silhouette value was used to measure separation between the three tissue classes. Accuracy was defined as the ratio of tissues with silhouette value more than zero. Green: ectoderm; Red: mesoderm; Blue: endoderm. (e) The correlation between PC1 and ‘blastoderm’ information (left) was the highest using ttmTF set. The silhouette value (right) was used to measure how similar an object is to its own cluster (cohesion) relative to the other clusters (separation). (f) The ratios of promoters to the tissues’ tsDMRs for both ttmTFs and non-ttmTFs. The 1,000-time permutation test was performed. (g) DNA methylation maps near the Hnf4a locus in 12 adult mouse tissues. Each track spans percent mCG (%mCG) values between 0 and 100%. The tracks include two tissues from ectoderm, four tissues from mesoderm and six tissues from endoderm. The tissues were ordered according to Hnf4a DNA-binding activities (increasing). The colour bar indicates the TF DNA-binding activities in log10(FOT).

    Notably, a number of ttmTFs identified here were consistent with previously reported roles of directly converting fibroblasts into the major cell type of the tissue (Table 1). For example, Hnf4a, Hnf1a and Foxa2 had been reported to drive the direct conversion of fibroblasts to hepatocytes9,40 and Myt1l, Lhx3 and Isl1 have been shown to convert MEF to spinal motor neurons41. These activities indicate dominant roles that ttmTFs play in determining tissue identity.

    Table 1: Overlap of ttmTFs with known TFs involved in iPS cell transforming.

    The identification of ttmTFs of tissues provides a conceptual framework for understanding how tissue identity is maintained by TFs. It is logical to predict that genes controlled by two or more ttmTFs may represent the biological processes of particular tissues relatively specifically. They submitted the TGs that were co-regulated by 2 ttmTFs to Reactome Pathway Database42,43 to find these processes. Reactome terms that were enriched in TGs controlled by dual ttmTF represent the major functions of the tissue (Fig. 6c). For example, TGs of multiple ttmTFs in eye, brain and spinal cord were enriched in neuron-related items, whereas TGs related to immune functions were enriched in spleen and thymus (Supplementary Data 6).

    All tissues are developed from three germ layers: ectoderm, mesoderm and endoderm. Because adult tissues are terminally differentiated, they cannot be clearly clustered into their germ layer origins based on their global proteome. They performed principal component analysis (PCA) to test whether the TF patterns were more suitable for clustering tissues to the ‘germ’ layers. They obtained clustering accuracy of 75% with all TFs and 80% with ttmTFs (Fig. 6d), outperforming the accuracy calculated with TF mRNA expression profiling22 The correlation between the ttmTFs and ‘germ layers’ exceeded 0.7 and was larger than those of the non-ttmTFs and all TFs (Fig. 6e).

    As ttmTFs play central roles in regulating gene expression in tissues, they investigated the upstream regulatory factors controlling ttmTFs in tissues. DNA methylation is an epigenetic mark that is critical for mammalian development and tissue lineages, and tissue-specific differentially methylated regions (tsDMRs) occur at distal cis-regulatory elements. These ‘vestigial’ enhancers are hypomethylated and lack active histone modifications in adult tissues but nevertheless exhibit activity during embryonic development, suggesting that epigenetic memory of embryonic development may be retained in adult tissues44. The ttmTF promoters are highly enriched in tsDMR compared with those of non-ttmTFs (Fig. 6f, Supplementary Fig. 7a and Supplementary Data 6). For example, Hnf4a locus was hypomethylated in the digestive system, particularly in the liver and colon, compared with other tissues (Fig. 6g).

    Regulation of liver TF pattern in response to perturbations

    We asked whether the TF hierarchy would change and particularly ttmTF regulation, under physiological and pathological conditions. They employed liver regeneration induced by partial hepatectomy (PHx) that removed ∼70% of the liver as a model for perturbation. As PHx is a dynamic process and prone to experimental variations, they included more initial experimental conditions to define a more accurate initial state. They combined 26 data sets of liver TFs obtained by catTFRE in physiology conditions and use them as the control experiment to construct a liver TF reference map that defines abundance range for each TF (Supplementary Data 7).

    The catTFRE experiments identified 420 TFs for the liver regeneration process, of which 401 TFs could be quantified and compared with the TF reference map of the liver. They found that the intensities of 188 TFs after PHx were greater than the upper quartile values (Q3) of the TF reference map in at least two out of the three individual measurements, and the 188 TFs were defined as outliers. They grouped TFs into four representative stages of liver regeneration according to their temporal behaviour: priming (0–12 h), early progression (24–48 h), later progression (3–5 days) and termination (5–7 days). The TFs related to immune response and NF-kB activation were immediately stimulated within 12 h; TFs that regulate developments constituted the second wave. Cell cycle signalling were activated in the progression phase and downregulated in the terminating phase when the Wnt/beta-catenin pathway was repressed and TGF-beta-Smad pathway was upregulated (Fig. 7a).

    Figure 7: Landscape of TF dynamics after PHx. Figure 7

    (a) Four major upregulated TF groups and their accordingly GO pathways in different stages during liver regeneration. GO terms were enriched using the TGs that were regulated by at least two TFs in the sub-clusters and expressed in according PHx data. (b) Four major functions categories of outlier TFs, namely immune and stimulus response, development and differentiation, nuclear receptors and metabolism, repressors and brakes. (c) Enrichment of downregulated and upregulated ttmTFs at each time point after PHx. The ttmTFs were significantly downregulated. The levels of downregulated and upregulated non-ttm TFs were used as the baseline. The P values were calculated using Fisher’s exact test, *P<0.1, **P<0.01. (d) Dynamic change of six hepatocyte nuclear factors in ttmTF group during liver regeneration.

    One third of the 188 outlier TFs can be classified into the four major functions categories, namely immune and stimulus response, development and differentiation, nuclear receptors and metabolism, repressors and brakes. Immune and developmental TFs are overexpressed in the earlier/middle stage, whereas nuclear receptor and repressors were dominant in the middle/later stage (Fig. 7b).We found that Myc/Max/Mad behaved as a switch in liver regeneration. Myc was stimulated in the priming stage while its antagonist Mad was unregulated in the terminating stage, suggesting the Myc/Max/Mad network is at work in regulating liver regeneration (Supplementary Fig. 7c).

    We found that ttmTFs tended to be downregulated when the fate of the tissue was altered. The liver ttmTFs were significantly decreased compared with that of the non-ttmTFs after PHx (Fig. 7c and Supplementary Fig. 7d), indicating liver cells lost their homeostasis and identity or dedifferentiation when dramatic perturbation occurred. Six members of the hepatocyte nuclear factor family in the liver ttmTF group were markedly downregulated in 12 h and 3 days after PHx, and showed a tendency of returning to their original and stable state in the terminating phase (Fig. 7d).

    Profiling of the global liver proteome during PHx identified downregulated proteins, which could be used as the TG products to trace back TFs that regulate them (Supplementary Fig. 7e). Many of these TFs that controlled downregulated proteins during PHx were indeed ttmTFs (Supplementary Fig. 7f and Supplementary Data 7). These results suggested that the liver lost ttmTFs during the process of tissue expansion—a trait that normally is not ascribed to liver, and implicated the importance of losing ttmTFs when the identity of the organ is perturbed during liver regeneration.



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    RedHat [8 Certification Exam(s) ]
    RES [5 Certification Exam(s) ]
    Riverbed [8 Certification Exam(s) ]
    RSA [15 Certification Exam(s) ]
    Sair [8 Certification Exam(s) ]
    Salesforce [5 Certification Exam(s) ]
    SANS [1 Certification Exam(s) ]
    SAP [98 Certification Exam(s) ]
    SASInstitute [15 Certification Exam(s) ]
    SAT [1 Certification Exam(s) ]
    SCO [10 Certification Exam(s) ]
    SCP [6 Certification Exam(s) ]
    SDI [3 Certification Exam(s) ]
    See-Beyond [1 Certification Exam(s) ]
    Siemens [1 Certification Exam(s) ]
    Snia [7 Certification Exam(s) ]
    SOA [15 Certification Exam(s) ]
    Social-Work-Board [4 Certification Exam(s) ]
    SpringSource [1 Certification Exam(s) ]
    SUN [63 Certification Exam(s) ]
    SUSE [1 Certification Exam(s) ]
    Sybase [17 Certification Exam(s) ]
    Symantec [135 Certification Exam(s) ]
    Teacher-Certification [4 Certification Exam(s) ]
    The-Open-Group [8 Certification Exam(s) ]
    TIA [3 Certification Exam(s) ]
    Tibco [18 Certification Exam(s) ]
    Trainers [3 Certification Exam(s) ]
    Trend [1 Certification Exam(s) ]
    TruSecure [1 Certification Exam(s) ]
    USMLE [1 Certification Exam(s) ]
    VCE [6 Certification Exam(s) ]
    Veeam [2 Certification Exam(s) ]
    Veritas [33 Certification Exam(s) ]
    Vmware [58 Certification Exam(s) ]
    Wonderlic [2 Certification Exam(s) ]
    Worldatwork [2 Certification Exam(s) ]
    XML-Master [3 Certification Exam(s) ]
    Zend [6 Certification Exam(s) ]





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