{"id":45156,"date":"2026-03-18T00:08:14","date_gmt":"2026-03-18T00:08:14","guid":{"rendered":"https:\/\/www.europesays.com\/be-fr\/45156\/"},"modified":"2026-03-18T00:08:14","modified_gmt":"2026-03-18T00:08:14","slug":"tous-les-cinq-types-de-bases-nucleiques-de-ladn-ont-ete-decouverts-sur-lasteroide-ryugu","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/be-fr\/45156\/","title":{"rendered":"Tous les cinq types de bases nucl\u00e9iques de l\u2019ADN ont \u00e9t\u00e9 d\u00e9couverts sur l\u2019Ast\u00e9ro\u00efde Ry\u00fbg\u00fb"},"content":{"rendered":"<p class=\"csp-catelogo\">\n\t\t\t\t\tActualit\u00e9s\n\t\t\t\t<\/p>\n<p>\t\t\t\t\t\t\t\t\t\t\t\t\t<a class=\"c-cate c-cate0\" href=\"https:\/\/www.nippon.com\/fr\/articlelist.html?f=ncf-category&amp;s=Science\" rel=\"nofollow noopener\" target=\"_blank\">Science<\/a><\/p>\n<p>\t\t\t\t18\/03\/2026<\/p>\n<p>Une \u00e9tude men\u00e9e par une \u00e9quipe japonaise et publi\u00e9e mardi dans la revue scientifique britannique Nature Astronomy a r\u00e9v\u00e9l\u00e9 que les cinq types de bases nucl\u00e9iques qui composent l\u2019ADN et l\u2019ARN ont \u00e9t\u00e9 d\u00e9couverts dans des \u00e9chantillons de sable pr\u00e9lev\u00e9s sur l\u2019ast\u00e9ro\u00efde Ry\u00fbg\u00fb, qui \u00e9volue entre la Terre et Mars depuis environ cinq millions d\u2019ann\u00e9es.<\/p>\n<p>Ces \u00e9chantillons ont \u00e9t\u00e9 ramen\u00e9s sur Terre par la sonde japonaise Hayabusa 2 en 2020.<\/p>\n<p>Comme des bases nucl\u00e9iques similaires ont \u00e9galement \u00e9t\u00e9 trouv\u00e9es dans des \u00e9chantillons provenant de l\u2019ast\u00e9ro\u00efde Bennu, rapport\u00e9s par une sonde am\u00e9ricaine, l\u2019\u00e9quipe nippone estime que cette d\u00e9couverte sur Ry\u00fbg\u00fb renforce l\u2019hypoth\u00e8se selon laquelle les \u00e9l\u00e9ments fondamentaux de la vie pourraient provenir de l\u2019ext\u00e9rieur de la Terre. L\u2019\u00e9quipe est principalement compos\u00e9e de chercheurs de l\u2019Agence japonaise pour les sciences et technologies marines et terrestres (J AMSTEC).<\/p>\n<p>Ry\u00fbg\u00fb et Bennu sont tous deux des ast\u00e9ro\u00efdes de type C (carbon\u00e9s), riches en mati\u00e8re organique et en eau. On pense qu\u2019ils contiennent des mat\u00e9riaux datant de la formation du syst\u00e8me solaire. Des \u00e9tudes ant\u00e9rieures avaient d\u00e9j\u00e0 d\u00e9tect\u00e9 l\u2019uracile, l\u2019une des bases de l\u2019ARN, dans des \u00e9chantillons de Ry\u00fbg\u00fb, tandis que ceux de Bennu contenaient tous les composants de l\u2019ARN, y compris les cinq bases nucl\u00e9iques et le sucre.<\/p>\n<p>Pour cette nouvelle \u00e9tude, Koga Toshiki, chercheur postdoctoral \u00e0 la JAMSTEC, et ses coll\u00e8gues ont utilis\u00e9 de l\u2019eau et de l\u2019acide chlorhydrique pour extraire des substances organiques d\u2019environ 20 milligrammes de sable provenant de Ry\u00fbg\u00fb.<\/p>\n<p class=\"photo_box_c_v2\"><a href=\"https:\/\/www.europesays.com\/be-fr\/wp-content\/uploads\/2026\/03\/2972080.jpg\" class=\"fancybox\" rel=\"gallery\" data-libid=\"2972080\"><img decoding=\"async\" src=\"https:\/\/www.europesays.com\/be-fr\/wp-content\/uploads\/2026\/03\/2972080.jpg\" data-libid=\"2972080\" alt=\"\"\/><\/a><\/p>\n<p>[Copyright The Jiji Press, Ltd.]<\/p>\n<p class=\"c-keywords\">\n\t\t\t\t\t\t\t\t\t\t\t\t <a href=\"\">science<\/a><br \/>\n\t\t\t\t\t \t\t\t\t\t\t\t <a href=\"\">Actu<\/a><br \/>\n\t\t\t\t\t \t\t\t\t\t\t\t <a href=\"\">espace<\/a><br \/>\n\t\t\t\t\t \t\t\t\t\t\t\t <a href=\"\">d\u00e9couverte<\/a>\n\t\t\t\t\t \t\t\t\t\t\t<\/p>\n","protected":false},"excerpt":{"rendered":"Actualit\u00e9s Science 18\/03\/2026 Une \u00e9tude men\u00e9e par une \u00e9quipe japonaise et publi\u00e9e mardi dans la revue scientifique britannique&hellip;\n","protected":false},"author":2,"featured_media":45157,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[70],"tags":[141,12,13,18,17,9432,1918,73,71,75,72,76,74],"class_list":{"0":"post-45156","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-sciences-et-technologies","8":"tag-actu","9":"tag-be","10":"tag-be-fr","11":"tag-belgique","12":"tag-belgium","13":"tag-decouverte","14":"tag-espace","15":"tag-science","16":"tag-science-and-technology","17":"tag-sciences","18":"tag-sciences-et-technologies","19":"tag-technologies","20":"tag-technology"},"share_on_mastodon":{"url":"https:\/\/pubeurope.com\/@be_fr\/116247272172998617","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts\/45156","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=45156"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/posts\/45156\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/media\/45157"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/media?parent=45156"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/categories?post=45156"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/be-fr\/wp-json\/wp\/v2\/tags?post=45156"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}