{"id":353171,"date":"2025-08-29T22:52:10","date_gmt":"2025-08-29T22:52:10","guid":{"rendered":"https:\/\/www.europesays.com\/fr\/353171\/"},"modified":"2025-08-29T22:52:10","modified_gmt":"2025-08-29T22:52:10","slug":"comment-la-vie-a-t-elle-commence-a-proliferer-sur-terre","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fr\/353171\/","title":{"rendered":"Comment la vie a-t-elle commenc\u00e9 \u00e0 prolif\u00e9rer sur Terre\u00a0?"},"content":{"rendered":"

D\u00c9CRYPTAGE<\/strong> – Des chimistes expliquent la fa\u00e7on dont l\u2019ARN a pu commencer \u00e0 se dupliquer sur la Terre primitive, il y a quelque 4\u00a0milliards d\u2019ann\u00e9es.<\/p>\n

Comment\u00a0la vie<\/a>\u00a0a-t-elle pu commencer \u00e0 prolif\u00e9rer sur la Terre primitive, il y a quelque 4\u00a0milliards d\u2019ann\u00e9es\u00a0? Parmi les interrogations, l\u2019\u00e9ternelle question de l\u2019\u0153uf et de la poule, mais en version microscopique\u00a0: la synth\u00e8se des prot\u00e9ines est au centre de la vie, or il faut notamment de\u00a0l\u2019ARN<\/a>\u00a0pour qu\u2019elle ait lieu\u00a0; mais ce dernier a lui-m\u00eame besoin de prot\u00e9ines pour \u00eatre fabriqu\u00e9. D\u00e8s lors, qui, des prot\u00e9ines ou de l\u2019ARN, est apparu en premier\u00a0?<\/p>\n

Un d\u00e9but de r\u00e9ponse \u00e0 cette question fondamentale vient d\u2019\u00eatre\u00a0propos\u00e9 dans Nature<\/a> \u00a0par une \u00e9quipe de chimistes de l\u2019University College de Londres (Grande-Bretagne), dirig\u00e9e par le Pr\u00a0Matthew Powner. Les chercheurs ont \u00e9labor\u00e9 une hypoth\u00e8se controvers\u00e9e sur l\u2019origine de la vie<\/a>. Elle permettrait notamment d\u2019expliquer que l\u2019ARN (qui sert \u00e9galement \u00e0 transcrire l\u2019ADN, le support de l\u2019h\u00e9r\u00e9dit\u00e9) puisse s\u2019associer dans une solution aqueuse avec des acides amin\u00e9s, des mol\u00e9cules, dont l\u2019encha\u00eenement cr\u00e9e des peptides et m\u00eame des prot\u00e9ines\u2026<\/p>\n

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