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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="2013-10-28T00:00:00-04:00" class="date-display-single">October 28, 2013</span></p><div class='syndicate'><h1>Scientists Recode Organism’s Genome</h1><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="A group of bacteria">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2013/10282013-recode.jpg?itok=CXS89wft&timestamp=1431700506 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/2013/10282013-recode.jpg?itok=sDzbolIM&timestamp=1431700506 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/2013/10282013-recode.jpg?itok=6IvIj6iJ&timestamp=1431700506 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/2013/10282013-recode.jpg?itok=97822xs2&timestamp=1431700506 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/2013/10282013-recode.jpg?itok=Bbr6Nqmt&timestamp=1431700506 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/2013/10282013-recode.jpg?itok=sDzbolIM&timestamp=1431700506" alt="A group of bacteria" title="A group of bacteria" />
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</picture><span class="caption">Escherichia coli.</span><span class="credit">Janice Haney Carr, CDC</span></div>
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</div><p>Researchers developed a method to engineer a bacterium’s genome to create new genetic codes. The technique has the potential to turn microbes into efficient living factories that can make novel compounds.</p>
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<p>The emerging field of synthetic biology seeks to redesign natural biological systems for new purposes. Living microbes have efficient mechanisms for quickly and reliably producing proteins, the building blocks of the cell. This ability has long been harnessed to produce large amounts of conventional proteins, such as insulin, for medical use.</p>
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<p>When proteins are made, the genetic code contained in DNA is transcribed into a closely related molecule called RNA. The RNA then serves as a template to make a protein.</p>
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<p>Each set of 3 DNA bases, called a codon, directs the cell’s machinery to add a specific amino acid to a growing protein chain. However, different codons can code for the same amino acid. For example, GCA, GCC, GCG, and GCT all direct different parts of the cell’s machinery to add the same amino acid, alanine. Similarly, UAG, UAA, and UGA are all RNA “stop” codons. Each recruits different machinery to stop the production of a protein once the amino acid chain is complete.</p>
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<p>A team led by Dr. George Church of Harvard Medical School and Dr. Farren Isaacs of the Yale School of Medicine set out to recode the <em>Escherichia coli </em>genome to allow it to incorporate a synthetic non-standard amino acid (NSAA) into its protein structures. This approach would allow the bacteria to make new materials. The work was funded in part by NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institute of General Medical Sciences (NIGMS), and an NIH Director’s Early Independence Award. Results appeared in the October 18, 2013, issue of <em>Science.</em></p>
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<p>In this proof-of-concept study, the researchers repurposed the UAG stop codon. First, they switched all instances of UAG in the genome to another stop codon, UAA. This ensured that protein production would still end at the appropriate points and allow the cell to function normally. They then removed the stop machinery associated with UAG from the cell. Finally, they introduced genetically engineered components (aminoacyl–tRNA synthetase and tRNA) that reassigned UAG to direct the cell to incorporate NSAAs into amino acid chains.</p>
|
||
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<p>To test the genomically recoded organism (GRO), the scientists included UAG codons in the sequence for a green fluorescent protein. They found that the GROs successfully incorporated NSAAs into the proteins.</p>
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<p>Removing the stop machinery associated with UAG codons didn’t impair the GRO's ability to reproduce. The GROs also showed increased resistance to a type of virus that infects bacteria. It’s possible that new genetic codes may protect cells by causing errors when viral proteins are translated.</p>
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||
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<p>The creation of a GRO raises the possibility that researchers might be able to retool nature and create new forms of proteins. In an accompanying study, the Harvard group showed that the approach may be feasible for several other codons in the genome as well.</p>
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||
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<p>“Since the genetic code is universal, it raises the prospect of recoding genomes of other organisms,” Isaacs says. “This has tremendous implications in the biotechnology industry and could open entirely new avenues of research and applications.”</p>
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<p>— by Katherine Wendelsdorf, Ph.D.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://publications.nigms.nih.gov/insidethecell/chapter2.html" target="_top">Inside the Cell: Code Reading</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/24136966">Genomically recoded organisms expand biological functions.</a> <em>Science</em>. 2013 Oct 18;342(6156):357-60. doi: 10.1126/science.1241459. PMID: 24136966.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), National Institute of General Medical Sciences (NIGMS), and an NIH Director’s Early Independence Award; U.S. Department of Energy; the National Science Foundation; Arnold and Mabel Beckman Foundation; and U.S. Department of Defense.</p>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong>Assistant Editors:</strong> Vicki Contie and Brian Doctrow, 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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<p>ISSN 2375-9593</p>
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