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Biologists call these sets \u201cgene families<\/a>.\u201d Over evolutionary time, genes sometimes duplicate. Extra copies can shift how strongly a function shows up in the body \u2013 a higher \u201cdose\u201d \u2013 or create room for small tweaks that help cells respond more flexibly.<\/p>\n Studying lifespan potential<\/p>\n Dr. Benjamin Padilla-Morales, from the Milner Center for Evolution<\/a> and the University of Bath\u2019s Department of Life Sciences, was the first author. <\/p>\n The study compared 46 mammalian species with high-quality, well-curated genomes. <\/p>\n For each species, the team used maximum lifespan potential (MLSP), defined as the longest confirmed age any individual of that species has reached, and matched it to the sizes of thousands of gene families. <\/p>\n They also accounted for traits that often track with lifespan, including body size, brain size relative to body size, how long pregnancy lasts<\/a>, and when animals first reproduce.<\/p>\n This design allowed them to ask a clear question: across mammals, do certain families get larger in species that live longer, and if so, which ones?<\/p>\n Immune system and lifespan potential<\/p>\n The strongest signal centered on the immune system<\/a>. The gene families that tended to be larger in long-lived mammals were involved in immune surveillance and clearance.<\/p>\n These functions help detect threats and clear cellular debris that accumulates with age.<\/p>\n The immune system does more than fight infections. It also removes damaged or \u201csenescent\u201d cells<\/a> that stop dividing and release stress signals, and it helps identify early cancer cells before they grow out of control.<\/p>\n As an animal ages, those jobs matter more. Expanding the families that handle them can help tissues maintain stability over many decades.<\/p>\n Brain size link plays a role<\/p>\n Across mammals, species with bigger brains for their body size often live longer. In this study, many of the same gene families that grow with lifespan also grow with relative brain size. <\/p>\n A large brain uses substantial energy and oxygen and produces more metabolic byproducts. Extra immune and housekeeping capacity supports this load and helps keep neural tissue stable.<\/p>\n The link implies a shared genetic background: immune-related expansions may support both long life and the demands of a large, energy-hungry brain<\/a>.<\/p>\n Padilla-Morales explained that scientists have long known relative brain size is linked to longevity. He said the two traits share an evolutionary path, with larger brains offering potential behavioral advantages.<\/p>\n He also noted that bigger-brained species don\u2019t just live longer because of ecological factors. Their genomes show parallel expansions in genes tied to survival and maintenance. <\/p>\n \u201cThis shows that brain size and immune resilience seem to have walked hand-in-hand in the evolutionary journey toward longer lives,\u201d Padilla-Morales explained.<\/p>\n Lifespan potential \u2013 what doesn\u2019t matter<\/p>\n Body mass itself \u2013 big versus small \u2013 did not account for the gene-family trends once other factors were included. <\/p>\n Life-history timings such as gestation length and age at first reproduction didn\u2019t drive the expansions either. <\/p>\n Those traits do correlate with lifespan in general, but they weren\u2019t behind which gene families got larger in this analysis.<\/p>\n The team checked a basic concern: maybe long-lived species just carry more genes overall. They do not. The pattern wasn\u2019t a blanket \u201cmore genes everywhere.\u201d It was specific to certain families tied to maintenance and defense.<\/p>\n The researchers looked at how these longevity-linked genes<\/a> behave in people. Human versions tend to be more active and produce more transcript variants \u2013 different \u201cedits\u201d of the same gene that yield slightly different proteins.<\/p>\n That diversity gives cells more ways to fine-tune responses, which fits the idea of a vigilant, flexible maintenance system.<\/p>\n The team compared their gene lists with earlier aging databases. The overlap wasn\u2019t perfect, which is common, but the functions aligned. <\/p>\n Prior work points to DNA damage responses, inflammation control<\/a>, and programmed cell death (apoptosis). The expanded families in this study cluster within the same biological pathways.<\/p>\n Maximum lifespan potential limitations<\/p>\n This is not \u201cthe cure for aging.\u201d The results show correlations, not causes. Evolution is complicated, and a gene family can expand for one reason and later take on another role. <\/p>\n Maximum lifespan potential is a record-holder measure, not an average, and records can reflect limited data or unusual individuals.<\/p>\n Even with those limits, the same immune-related signal shows up across dozens of species, and that deserves attention. It shifts the focus from a single switch to scaled-up maintenance.<\/p>\n Future of species lifespan research<\/p>\n Overall, the findings point to systems-level resilience. Long-lived mammals don\u2019t rely on a magic change in metabolism. <\/p>\n They tend to carry more copies of genes that help detect problems early, remove damaged cells, and keep tissues \u2013 especially the brain \u2013 stable for many years.<\/p>\n For anyone thinking about healthy aging, this suggests a practical target. Immune surveillance and cellular housekeeping may be as important as tweaking metabolism or chasing one-off genetic fixes. <\/p>\n It\u2019s a reminder that evolution didn\u2019t grant immortality. It boosted the systems that prevent small problems from turning into big ones, and it did so in ways we can measure \u2013 across 46 species, using maximum lifespan potential, and with clear links to brain size and immune function.<\/p>\n The study is published in the journal\u00a0Scientific Reports<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.\u00a0<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Bowhead whales can live more than 200 years. Tiny shrews barely make it a year. Some sea sponge…\n","protected":false},"author":2,"featured_media":91217,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[64,63,128,338],"class_list":{"0":"post-91216","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-wildlife","8":"tag-au","9":"tag-australia","10":"tag-science","11":"tag-wildlife"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/91216","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/comments?post=91216"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/posts\/91216\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media\/91217"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/media?parent=91216"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/categories?post=91216"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/au\/wp-json\/wp\/v2\/tags?post=91216"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"Phylogenetic](\"https:\/\/www.newsbeep.com\/au\/wp-content\/uploads\/2025\/08\/animals_lifespan_chart-infographic_maximum-lifespan-potential_MLSP_1s.webp.webp\")
<\/a>Phylogenetic distribution of life history and morphological traits (maximum lifespan potential, relative brain size, body mass, gestation time and age at sexual maturity) in mammals. A phylogenetic tree for 46 mammal species with fully sequenced genomes is shown. Bars show the relative value of each variable, including log10 values of maximum lifespan potential (MLSP, green), relative brain size (orange), body mass (purple), gestation time (pink), and age at sexual maturity (blue). See Supplementary Table 1 for raw data and silhouette species names. Click image to enlarge. Credit: Scientific ReportsHumans and longevity genes<\/p>\n