{"id":156480,"date":"2026-06-27T19:28:19","date_gmt":"2026-06-27T19:28:19","guid":{"rendered":"https:\/\/www.europesays.com\/be-fr\/156480\/"},"modified":"2026-06-27T19:28:19","modified_gmt":"2026-06-27T19:28:19","slug":"pourquoi-les-paresseux-sont-ils-si-lents","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/be-fr\/156480\/","title":{"rendered":"Pourquoi les paresseux sont-ils si lents\u00a0?"},"content":{"rendered":"

Le paresseux d\u00e9tient un record peu enviable : celui du mammif\u00e8re le plus lent de la plan\u00e8te. Cette lenteur n’est pourtant pas un d\u00e9faut, mais une adaptation remarquable \u00e0 un mode de vie fond\u00e9 sur les \u00e9conomies d’\u00e9nergie. Une \u00e9tude publi\u00e9e dans BMC Biology apporte aujourd’hui<\/a> de nouveaux indices sur l’origine g\u00e9n\u00e9tique de cette particularit\u00e9.<\/p>\n

Des \u00ab\u00a0g\u00e8nes sauteurs\u00a0\u00bb h\u00e9rit\u00e9s de l’\u00e9volution<\/p>\n

Pour la premi\u00e8re fois, une \u00e9quipe internationale a s\u00e9quenc\u00e9 en d\u00e9tail le g\u00e9nome d’un paresseux \u00e0 deux doigts et l’a compar\u00e9 \u00e0 celui d’autres mammif\u00e8res apparent\u00e9s, comme le tatou et le fourmilier. Les chercheurs ont identifi\u00e9 plusieurs s\u00e9quences d’ADN tr\u00e8s particuli\u00e8res, appel\u00e9es transposons ou \u00ab\u00a0g\u00e8nes sauteurs\u00a0\u00bb. Capables de se d\u00e9placer dans le g\u00e9nome, ces \u00e9l\u00e9ments g\u00e9n\u00e9tiques semblent avoir \u00e9t\u00e9 conserv\u00e9s chez les paresseux<\/a> pendant pr\u00e8s de 30 millions d’ann\u00e9es.<\/p>\n

\u00ab\u00a0L’IA ne sert qu’\u00e0 nous rendre plus paresseux\u00a0\u00bb<\/a><\/p>\n

Fait intrigant : nombre d’entre eux sont associ\u00e9s aux mitochondries, les structures cellulaires responsables de la production d’\u00e9nergie. Les scientifiques pensent que ces s\u00e9quences pourraient avoir contribu\u00e9 \u00e0 l’\u00e9volution du m\u00e9tabolisme exceptionnellement lent des paresseux, qui d\u00e9pensent moins de la moiti\u00e9 de l’\u00e9nergie attendue pour un mammif\u00e8re de leur taille.<\/p>\n

Au-del\u00e0 de la curiosit\u00e9 biologique, ces r\u00e9sultats pourraient int\u00e9resser la m\u00e9decine. Mieux comprendre comment les paresseux restent en bonne sant\u00e9 malgr\u00e9 un fonctionnement \u00e9nerg\u00e9tique minimal pourrait \u00e9clairer l’\u00e9tude du vieillissement, du diab\u00e8te ou encore de certaines maladies neurod\u00e9g\u00e9n\u00e9ratives. Qui aurait cru que la lenteur des paresseux puisse un jour inspirer la recherche dans ces domaines ?<\/p>\n

Paresseux retrouv\u00e9s morts \u00e0 l’a\u00e9roport de Li\u00e8ge : pourquoi les animaux sont-ils rest\u00e9s coinc\u00e9s si longtemps dans l’avion?<\/a><\/p>\n

Pour acc\u00e9der \u00e0 cet article, veuillez vous connecter au r\u00e9seau internet.<\/p>\n","protected":false},"excerpt":{"rendered":"Le paresseux d\u00e9tient un record peu enviable : celui du mammif\u00e8re le plus lent de la plan\u00e8te. Cette…\n","protected":false},"author":2,"featured_media":156481,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_share_on_mastodon":"0"},"categories":[70],"tags":[8427,3180,1613,35657,1615,12,13,18,17,50238,1618,1619,5307,4884,17190,127,1625,35202,1627,9588,1628,3181,1967,48045,48046,1630,1631,1632,4974,48048,2292,50239,86,17830,1635,7013,188,50240,48049,4127,1636,4130,109,1642,1643,45950,23034,73,71,75,72,50241,48055,18727,76,74,1288,23037,5977,1648,1649,1650,50242],"class_list":["post-156480","post","type-post","status-publish","format-standard","has-post-thumbnail","category-sciences-et-technologies","tag-3d","tag-adn","tag-anatomy","tag-artificial","tag-baby","tag-be","tag-be-fr","tag-belgique","tag-belgium","tag-biological","tag-biology","tag-birth","tag-cell","tag-child","tag-conception","tag-design","tag-development","tag-dna","tag-embryo","tag-embryon","tag-embryonic","tag-epigenetique","tag-female","tag-fertile","tag-fertilization","tag-fetal","tag-fetus","tag-foetus","tag-gene","tag-genetic","tag-genetique","tag-gynaecology","tag-health","tag-helix","tag-human","tag-icon","tag-illustration","tag-infertility","tag-insemination","tag-laboratory","tag-life","tag-medicine","tag-people","tag-pregnancy","tag-pregnant","tag-reproductive","tag-research","tag-science","tag-science-and-technology","tag-sciences","tag-sciences-et-technologies","tag-scientific","tag-sperm","tag-strand","tag-technologies","tag-technology","tag-test","tag-treatment","tag-tube","tag-umbilical","tag-unborn","tag-uterus","tag-vitro"],"share_on_mastodon":{"url":"","error":"Validation failed: Text character limit of 500 exceeded"},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts\/156480","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/comments?post=156480"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts\/156480\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/media\/156481"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/media?parent=156480"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/categories?post=156480"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/tags?post=156480"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}