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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="2022-07-12T00:00:00-04:00" class="date-display-single">July 12, 2022</span></p><div class='syndicate'><h1>Aging insights from reptiles and amphibians</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul>
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<li>Researchers identified patterns in the aging rates and longevity of reptiles and amphibians that suggest how these traits evolved.</li>
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<li>The results could inform our understanding of aging in people and how much it can be delayed or prevented.</li>
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</ul></div><div class="media-float-right"><div class="ds-1col file file-image file-image-png view-mode-floated_media clearfix">
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<picture title="Face of a tuatara">
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2022/20220712-tuatara.png?itok=u2mZQntO&timestamp=1657562758 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/2022/20220712-tuatara.png?itok=hJTL_kUj&timestamp=1657562758 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/2022/20220712-tuatara.png?itok=1NeuzMoa&timestamp=1657562758 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/2022/20220712-tuatara.png?itok=LJ1wCMTW&timestamp=1657562758 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/2022/20220712-tuatara.png?itok=rSZSLMPo&timestamp=1657562758 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/2022/20220712-tuatara.png?itok=hJTL_kUj&timestamp=1657562758" alt="Face of a tuatara" title="Face of a tuatara" />
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</picture><span class="caption">Scientists found that tuataras (Sphenodon punctatus), shown here, are among species that age little if at all, living an average of 137 years. </span><span class="credit">Sarah Lamar, Penn State</span></div>
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</div><p>Aging rates vary widely across animal species. Understanding how species evolved to age at different rates can provide insight into how much aging might be altered in humans. One way to examine this is to compare aging rates and longevity across many species in the wild. Previous such comparisons have focused on birds and mammals. Although some of the longest-lived vertebrate species are reptiles or amphibians, there have been few comparisons of aging among them.</p>
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||
<p>In a new study, a team of more than 100 researchers compiled datasets on aging and longevity collected from reptiles and amphibians in the wild. The data included 107 populations representing 77 species. The team examined this data as well as corresponding data on birds and mammals. This allowed them to test several different hypotheses about aging. The results of the study, which was funded in part by NIH, appeared in <em>Science </em>on June 24, 2022.</p>
|
||
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||
<p>One hypothesis predicts that cold-blooded species age more slowly than warm-blooded species. This is because cold-blooded species tend to have slower metabolisms, which can slow down even further in the cold. The team found that some of the reptile and amphibian species showed very little aging. But on average, reptiles and amphibians, which are cold-blooded, did not age slower or live longer than warm-blooded species. Aging rates and longevity also varied more among reptiles and amphibians than among warm-blooded species. These results suggest that slow aging is not simply a consequence of being cold-blooded.</p>
|
||
|
||
<p>Another hypothesis suggests that protective traits, like hard shells or poison, contribute to slower aging. The researchers found this to be the case in reptiles and amphibians. Species with physical protection, such as turtles, lived longer than other species.</p>
|
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|
||
<p>The team also found that reptiles that began to reproduce at later ages aged more slowly and lived longer. Amphibians that began to reproduce at later ages lived longer but did not age more slowly. However, amphibian aging did depend on the number of eggs produced per year. Species that produced more eggs per year aged faster. These findings are in line with a hypothesis that aging rates, longevity, and reproductive life history evolve together.</p>
|
||
|
||
<p>“Anecdotal evidence exists that some reptiles and amphibians age slowly and have long lifespans, but until now no one has actually studied this on a large scale across numerous species in the wild,” says senior author Dr. David Miller. “If we can understand what allows some animals to age more slowly, we can better understand aging in humans, and we can also inform conservation strategies for reptiles and amphibians, many of which are threatened or endangered.”</p>
|
||
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||
<p>In a related study in the same issue of <em>Science</em> that was also supported by NIH, researchers from the University of Southern Denmark studied aging rates in 52 turtle and tortoise species living in captivity. About three-quarters of these species had slow-to-negligible aging rates. About 80% aged more slowly than humans. This supports the findings of the first study that species with protection, like shells, tend to age slowly and live for a long time.</p>
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<p>—by Brian Doctrow, Ph.D.</p></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/healthy-habits-can-lengthen-life" target="_top">Healthy Habits Can Lengthen Life</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/calorie-restriction-slows-age-related-epigenetic-changes" target="_top">Calorie Restriction Slows Age-Related Epigenetic Changes</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/drugs-extend-healthy-lifespan-mice" target="_top">Drugs Extend Healthy Lifespan in Mice</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/dna-changes-predict-longevity" target="_top">DNA Changes Predict Longevity</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/protein-consumption-linked-longevity" target="_top">Protein Consumption Linked to Longevity</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/how-resveratrol-may-fight-aging" target="_top">How Resveratrol May Fight Aging</a></li><li><a href="https://newsinhealth.nih.gov/2016/06/can-you-lengthen-your-life" target="_top">Can You Lengthen Your Life?</a></li><li><a href="https://www.nia.nih.gov/health/topics/aging" target="_top">Aging</a></li><li><a href="https://www.nia.nih.gov/health/topics/anti-aging-and-longevity" target="_top">Anti-Aging and Longevity</a></li><li><a href="https://www.nps.gov/articles/reptiles-and-amphibians-distribution.htm" target="_top">Reptiles and Amphibians (National Park Service)</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="https://pubmed.ncbi.nlm.nih.gov/35737773/">Diverse aging rates in ectothermic tetrapods provide insights for the evolution of aging and longevity.</a> Reinke BA, Cayuela H, Janzen FJ, Lemaître JF, Gaillard JM, Lawing AM, Iverson JB, Christiansen DG, Martínez-Solano I, Sánchez-Montes G, Gutiérrez-Rodríguez J, Rose FL, Nelson N, Keall S, Crivelli AJ, Nazirides T, Grimm-Seyfarth A, Henle K, Mori E, Guiller G, Homan R, Olivier A, Muths E, Hossack BR, Bonnet X, Pilliod DS, Lettink M, Whitaker T, Schmidt BR, Gardner MG, Cheylan M, Poitevin F, Golubović A, Tomović L, Arsovski D, Griffiths RA, Arntzen JW, Baron JP, Le Galliard JF, Tully T, Luiselli L, Capula M, Rugiero L, McCaffery R, Eby LA, Briggs-Gonzalez V, Mazzotti F, Pearson D, Lambert BA, Green DM, Jreidini N, Angelini C, Pyke G, Thirion JM, Joly P, Léna JP, Tucker AD, Limpus C, Priol P, Besnard A, Bernard P, Stanford K, King R, Garwood J, Bosch J, Souza FL, Bertoluci J, Famelli S, Grossenbacher K, Lenzi O, Matthews K, Boitaud S, Olson DH, Jessop TS, Gillespie GR, Clobert J, Richard M, Valenzuela-Sánchez A, Fellers GM, Kleeman PM, Halstead BJ, Grant EHC, Byrne PG, Frétey T, Le Garff B, Levionnois P, Maerz JC, Pichenot J, Olgun K, Üzüm N, Avcı A, Miaud C, Elmberg J, Brown GP, Shine R, Bendik NF, O'Donnell L, Davis CL, Lannoo MJ, Stiles RM, Cox RM, Reedy AM, Warner DA, Bonnaire E, Grayson K, Ramos-Targarona R, Baskale E, Muñoz D, Measey J, de Villiers FA, Selman W, Ronget V, Bronikowski AM, Miller DAW. <em>Science</em>. 2022 Jun 24;376(6600):1459-1466. doi: 10.1126/science.abm0151. Epub 2022 Jun 23. PMID: 35737773.<br />
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<br />
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<a href="https://pubmed.ncbi.nlm.nih.gov/35737795/">Slow and negligible senescence among testudines challenges evolutionary theories of senescence.</a> da Silva R, Conde DA, Baudisch A, Colchero F. <em>Science</em>. 2022 Jun 24;376(6600):1466-1470. doi: 10.1126/science.abl7811. Epub 2022 Jun 23. PMID: 35737795.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute on Aging (NIA); Swiss National Science Foundation; University of Southern Denmark; Villum Fonden.</p>
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