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<p class="publishdate"><span class="tag-term">Media Advisory</span></p><p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2012-12-10T07:30:00-05:00" class="date-display-single">Monday, December 10, 2012</span></p><h1>NIH scientists uncover how immune cells sense who they are</h1><p class="subtitle">
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<p>Scientists at the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), a part of the National Institutes of Health, have demonstrated that DNA previously thought to be "junk" plays a critical role in immune system response. The team's findings were published in Cell and may lead to the identification of new therapeutic targets for the treatment of immune-related disorders.</p>
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<p>There are 3.2 billion DNA base pairs in the human genome, but only 2 percent are in the regions we call genes, which provide the code for proteins. Up until recently, the role of the rest of the genome was mostly unknown and overlooked. NIH researchers used whole genome DNA sequencing technology that allowed them to "see" which part of the genomic DNA is actively engaged in supporting various cellular functions. The investigators found that members of the signal transducers and activators of transcription (STAT) protein family play a major role in shaping the identity of the immune system's T helper cells. Importantly, when studying the impact of "junk" DNA, they saw that this greater than expected role was made possible by the STAT proteins’ regulation of enhancer activity. Enhancers are short DNA regions that are outside the genes, but regulate gene transcription. While enhancers do not directly code for proteins, they regulate the protein production process.</p>
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<p>This work provides an example of how the cellular environment helps determine cell identity. Specifically, the research team demonstrated that STAT proteins act as cellular environmental sensors that, by regulating enhancers residing in the "junk" region of the genome, determine what subtype a T cell becomes. The present work should help clarify how these switches may relate to genetic risk of immune diseases.</p>
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<h3>Who</h3>
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<p>Lead author John O’Shea, M.D., the NIAMS’ scientific director and chief of the Molecular Immunology and Inflammation Branch, is available to comment on these findings.</p>
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<h3>Contact</h3>
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<p>To schedule interviews, please contact Trish Reynolds, (301) 496-8190, <a href="mailto:reynoldsp2@mail.nih.gov">reynoldsp2@mail.nih.gov</a>.</p>
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<p>The mission of the NIAMS, a part of the U.S. Department of Health and Human Services' National Institutes of Health, is to support research into the causes, treatment and prevention of arthritis and musculoskeletal and skin diseases; the training of basic and clinical scientists to carry out this research; and the dissemination of information on research progress in these diseases. For more information about the NIAMS, call the information clearinghouse at (301) 495-4484 or (877) 22-NIAMS (free call) or visit the NIAMS website at <a href="http://www.niams.nih.gov">http://www.niams.nih.gov</a>.</p>
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