{"id":1263,"date":"2025-05-20T09:00:00","date_gmt":"2025-05-20T07:00:00","guid":{"rendered":"https:\/\/smalltalks.eu\/blog\/?p=1263"},"modified":"2026-10-09T07:45:04","modified_gmt":"2026-10-09T05:45:04","slug":"larn-aux-origines-de-la-vie-sur-terre-science-etonnante","status":"publish","type":"post","link":"https:\/\/smalltalks.eu\/blog\/2025\/05\/20\/larn-aux-origines-de-la-vie-sur-terre-science-etonnante\/","title":{"rendered":"L&#8217;ARN aux origines de la vie sur Terre ? (Science \u00e9tonnante)"},"content":{"rendered":"\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"L&amp;apos;ARN aux Origines de la Vie sur Terre ? \u2014 Le Monde \u00e0 ARN\" width=\"640\" height=\"360\" src=\"https:\/\/www.youtube.com\/embed\/HR3fLfHu9U4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Et si la vie sur Terre avait commenc\u00e9 par de l&#8217;ARN, avant l&#8217;apparition de l&#8217;ADN et des prot\u00e9ines ? C&#8217;est l&#8217;hypoth\u00e8se dite du \u00ab monde \u00e0 ARN \u00bb.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">David Louapre part des caract\u00e9ristiques du vivant et de LUCA, notre dernier anc\u00eatre commun, puis explique ce qui rend l&#8217;ARN si particulier : c&#8217;est un biopolym\u00e8re programmable qui peut \u00e0 la fois porter de l&#8217;information, comme l&#8217;ADN, et catalyser des r\u00e9actions, comme les prot\u00e9ines (on parle alors de ribozymes). Il revient ensuite sur l&#8217;exp\u00e9rience de Miller-Urey, sur la formation spontan\u00e9e des nucl\u00e9otides et sur la grande question encore ouverte : un ARN capable de se r\u00e9pliquer lui-m\u00eame.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Voir aussi : <a href=\"https:\/\/smalltalks.eu\/blog\/?p=375\">penser le vivant autrement<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Vid\u00e9o de David Louapre (Science \u00e9tonnante), avec Philippe Nghe (ESPCI). Compl\u00e9ments sur <a href=\"https:\/\/scienceetonnante.com\/blog\/2025\/05\/16\/lhypothese-du-monde-a-arn\/\">le blog de Science \u00e9tonnante<\/a>.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Et si la vie sur Terre avait commenc\u00e9 par de l&#8217;ARN, avant l&#8217;apparition de l&#8217;ADN et des prot\u00e9ines ? C&#8217;est l&#8217;hypoth\u00e8se dite du \u00ab monde \u00e0 ARN \u00bb. David Louapre part des caract\u00e9ristiques du vivant et de LUCA, notre dernier anc\u00eatre commun, puis explique ce qui rend l&#8217;ARN si particulier : c&#8217;est un biopolym\u00e8re programmable qui peut \u00e0 la fois porter de l&#8217;information, comme l&#8217;ADN, et catalyser des r\u00e9actions, comme les prot\u00e9ines (on parle alors de ribozymes). Il revient ensuite&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/smalltalks.eu\/blog\/2025\/05\/20\/larn-aux-origines-de-la-vie-sur-terre-science-etonnante\/\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[123,280],"tags":[],"class_list":["post-1263","post","type-post","status-publish","format-standard","hentry","category-science-etonnante","category-sciences"],"_links":{"self":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts\/1263","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/comments?post=1263"}],"version-history":[{"count":1,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts\/1263\/revisions"}],"predecessor-version":[{"id":1273,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/posts\/1263\/revisions\/1273"}],"wp:attachment":[{"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/media?parent=1263"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/categories?post=1263"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/smalltalks.eu\/blog\/wp-json\/wp\/v2\/tags?post=1263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}