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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2017-01-31T00:00:00-05:00" class="date-display-single">January 31, 2017</span></p><div class='syndicate'><h1>Early sentinels of multidrug-resistant TB</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<li>Researchers identified mutations that often precede multidrug resistance in the bacteria that cause tuberculosis (TB).</li>
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<li>The findings may lead to new tests for drug resistance that could guide treatment options and help prevent development and spread of further resistance.</li>
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<picture title="Mycobacterium tuberculosis.">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2017/20170128-tb.jpg?itok=6A8p9vXW&timestamp=1485876790 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170128-tb.jpg?itok=UvEsVsDb&timestamp=1485876790 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2017/20170128-tb.jpg?itok=BLzKF--L&timestamp=1485876790 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2017/20170128-tb.jpg?itok=Ce2T39l3&timestamp=1485876790 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2017/20170128-tb.jpg?itok=ZwHuiZ74&timestamp=1485876790 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2017/20170128-tb.jpg?itok=UvEsVsDb&timestamp=1485876790" alt="Mycobacterium tuberculosis." title="Mycobacterium tuberculosis." />
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</picture><span class="caption">Scanning electron micrograph of Mycobacterium tuberculosis, the bacteria that cause TB.</span><span class="credit">NIAID</span></div>
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</div><p>TB is a contagious disease caused by infection with <em>Mycobacterium tuberculosis (Mtb)</em> bacteria. It’s spread through the air and usually affects the lungs. TB is a leading cause of disability worldwide. It results in 1.5 million deaths each year. Of those, about 480,000 are caused by multidrug-resistant TB, which is resistant to at least 2 of the most potent TB drugs available: rifampicin and isoniazid. Treatment for multidrug-resistant TB has significant side effects and can last more than 18 months.</p>
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<p>Effective TB treatment depends on detecting resistance as early as possible. The main diagnostic test for multidrug-resistant TB is called <a href="https://www.cdc.gov/mmwr/pdf/wk/mm6241.pdf">Xpert MTB/RIF</a>. It detects <em>Mtb</em> strains resistant to rifampicin. Testing against rifampicin resistance is used as a “proxy” for identifying multidrug-resistant TB and assumes that resistance to both rifampicin and isoniazid is present, which then suggests that patients should be prescribed drug therapy specific for multidrug-resistant TB. However, recent studies have found that most strains evolve resistance to isoniazid before rifampicin. A team led by Dr. Ashlee M. Earl of the Broad Institute of MIT and Harvard set out to study the development of genetic mutations that lead to multidrug-resistant TB. These could serve as early sentinels to enable better tracking and treatments. The work was supported by NIH’s National Institute of Allergy and Infectious Diseases (NIAID). Results were published online in <em>Nature Genetics</em> on January 16, 2017.</p>
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||
<p>The researchers examined whole-genome sequences from more than 5,300 <em>Mtb</em> strains isolated from TB patients from 48 countries on 5 continents. They found that more than 40% of the strains carried mutations previously implicated in drug resistance, and 18% carried mutations for both rifampicin and isoniazid resistance. Additionally, 5% carried mutations for resistance to 4 TB drugs—rifampicin, isoniazid, ofloxacin, and kanamycin—classifying them as “extensively” drug resistant <em>Mtb</em>.</p>
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||
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||
<p>The team’s analysis suggested that drug resistance arose through similar mechanisms in different geographic regions. In fact, they calculated that multi-drug resistant and extensively drug-resistant strains evolved independently in the sample hundreds of times. Notably, isoniazid resistance preceded resistance to rifampicin or other drugs in nearly all cases. These results suggest that by the time a mutation is detectable by the Xpert MTB/RIF test, the strain is likely already resistant to isoniazid and other drugs.</p>
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||
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||
<p>The scientists identified several genetic mutations that often arise before multidrug resistance. The most common by far caused isoniazid resistance and was in a gene called <em>katG</em>. The early identification and appropriate treatment of people with isoniazid-resistant <em>Mtb</em> strains might thus prevent the spread of strains resistant to additional drugs.</p>
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<p>“These results suggest that a universal diagnostic test that includes harbinger mutations, such as the key <em>katG</em> mutation, could serve as an early warning signal for multidrug resistance,” Earl says. “Surveillance efforts that target these mutations could help health authorities better allocate resources to combat the emergence and spread of multidrug-resistant TB strains.”</p>
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<p>Future studies will be needed to confirm that these harbinger mutations increase the risk of developing multidrug-resistant TB within a given population.</p>
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<p>—by Harrison Wein, Ph.D.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.nih.gov/news-events/nih-research-matters/predicting-effective-drug-combinations-tb" target="_top">Predicting Effective Drug Combinations for TB</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/development-antibiotics-treat-tuberculosis" target="_top">Development of Antibiotics to Treat Tuberculosis</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/new-test-detects-tb-less-2-hours" target="_top">New Test Detects TB in Less than 2 Hours </a></li><li><a href="https://www.niaid.nih.gov/diseases-conditions/tuberculosis-tb" target="_top">Tuberculosis (TB) </a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://www.ncbi.nlm.nih.gov/pubmed/28092681">Genomic analysis of globally diverse Mycobacterium tuberculosis strains provides insights into the emergence and spread of multidrug resistance.</a> Manson AL, Cohen KA, Abeel T, Desjardins CA, Armstrong DT, Barry CE 3rd, Brand J; TBResist Global Genome Consortium., Chapman SB, Cho SN, Gabrielian A, Gomez J, Jodals AM, Joloba M, Jureen P, Lee JS, Malinga L, Maiga M, Nordenberg D, Noroc E, Romancenco E, Salazar A, Ssengooba W, Velayati AA, Winglee K, Zalutskaya A, Via LE, Cassell GH, Dorman SE, Ellner J, Farnia P, Galagan JE, Rosenthal A, Crudu V, Homorodean D, Hsueh PR, Narayanan S, Pym AS, Skrahina A, Swaminathan S, Van der Walt M, Alland D, Bishai WR, Cohen T, Hoffner S, Birren BW, Earl AM. <em>Nat Genet</em>. 2017 Jan 16. doi: 10.1038/ng.3767. [Epub ahead of print]. PMID: 28092681.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Allergy and Infectious Diseases (NIAID); Korean CDC, Korean Ministry of Health and Welfare; and Howard Hughes Medical Institute.</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-can-we-slow-aging">Research in Context: Can we slow aging?</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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