{"id":74589,"date":"2026-02-04T12:00:00","date_gmt":"2026-02-04T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/senegal\/politique\/origine-de-luca-ancetre-de-tous-les-etres-vivants"},"modified":"2026-02-05T01:37:45","modified_gmt":"2026-02-05T01:37:45","slug":"origine-de-luca-ancetre-de-tous-les-etres-vivants","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants","title":{"rendered":"Origine de Luca, Ance\u0302Tre de Tous les E\u0302Tres Vivants"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Senegal. <\/strong><\/span>De la plus petite bacte\u0301rie aux plus grands des mammife\u0300res, tous les e\u0302tres vivants appartiennent a\u0300 une seule et me\u0302me ligne\u0301e. Cette ide\u0301e, aujourd\u2019hui solidement e\u0301tablie, converge vers un ance\u0302tre commun universel: Luca, pour \u00ab Last Universal Common Ancestor \u00bb. Il ne s\u2019agit pas du premier e\u0302tre vivant, mais du dernier ance\u0302tre partage\u0301 par toutes les formes de vie actuelles. Autrement dit, Luca est le survivant d\u2019une diversite\u0301 ancienne, la seule ligne\u0301e cellulaire a\u0300 avoir traverse\u0301 les 4 milliards d\u2019anne\u0301es d\u2019histoire de la biosphe\u0300re sans s\u2019e\u0301teindre, comme nous l\u2019expliquions dans notre pre\u0301ce\u0301dent article intitule \u00ab Luca, l\u2019ance\u0302tre de tous les e\u0302tres vivants\u00ab.<\/p>\n<p><b>Luca, seul survivant aux bouleversements de la Terre primitive<\/b><\/p>\n<p>Les travaux re\u0301cents ont profonde\u0301ment renouvele\u0301 notre vision de ce personnage central de l\u2019e\u0301volution. Une e\u0301tude, re\u0301alise\u0301e par des chercheurs de l\u2019universite\u0301 de Bristol (Royaume-Uni) et publie\u0301e en juillet 2024 dans la revue Nature Ecology &amp; Evolution, a tente\u0301 de reconstituer le ge\u0301nome de Luca en comparant ceux de 700 bacte\u0301ries et arche\u0301es. En identifiant les familles de ge\u0300nes partage\u0301es et en tenant compte des duplications, pertes et transferts horizontaux, les chercheurs estiment que Luca posse\u0301dait environ 2 600 ge\u0300nes \u2014 une complexite\u0301 comparable a\u0300 celle de bacte\u0301ries modernes. Luca n\u2019e\u0301tait donc pas une entite\u0301 fruste, mais un organisme de\u0301ja\u0300 tre\u0300s e\u0301labore\u0301, dote\u0301 d\u2019un me\u0301tabolisme flexible, de me\u0301canismes de re\u0301paration de l\u2019ADN, et me\u0302me d\u2019une e\u0301bauche de syste\u0300me immunitaire de type Crispr-Cas.<\/p>\n<p>D\u2019ou\u0300 venait-il, alors? Sur le plan e\u0301volutif, Luca se situe apre\u0300s une longue phase de ta\u0302tonnements biologiques. L\u2019e\u0301mergence de la vie a probablement donne\u0301 naissance a\u0300 de multiples ligne\u0301es cellulaires primitives, mais une seule \u2014 celle de Luca \u2014 a surve\u0301cu aux bouleversements de la Terre primitive. La datation reste de\u0301battue: l\u2019e\u0301tude de l\u2019universite\u0301 de Bristol place Luca vers 4,2 milliards d\u2019anne\u0301es, soit a\u0300 peine quelques centaines de millions d\u2019anne\u0301es apre\u0300s la formation de la Terre et l\u2019impact ge\u0301ant a\u0300 l\u2019origine de la Lune. D\u2019autres chercheurs, comme Patrick Forterre, microbiologiste a\u0300 l\u2019Institut Pasteur et l\u2019un des cre\u0301ateurs du terme Luca, jugent cette chronologie trop rapide et situent Luca pluto\u0302t entre 3,9 et 3,5 milliards d\u2019anne\u0301es, a\u0300 une e\u0301poque plus compatible avec les premie\u0300res traces fossiles connues.<\/p>\n<p><b>Avant Luca, Fuca<\/b><\/p>\n<p>Mais quelle que soit la date pre\u0301cise, un point fait consensus: Luca n\u2019e\u0301tait pas le de\u0301but de l\u2019histoire. Il a eu des ance\u0302tres, ne\u0301cessairement plus simples, que l\u2019on qualifie parfois de pre\u0301-cellulaires. Ces entite\u0301s ne relevaient pas encore pleinement du vivant tel que nous le de\u0301finissons aujourd\u2019hui. Avant Luca, il y aurait eu ce que certains appellent Fuca (\u00ab First Universal Common Ancestor \u00bb), un stade hypothe\u0301tique ou\u0300 des syste\u0300mes chimiques complexes, capables d\u2019e\u0301volution, e\u0301taient confine\u0301s dans des compartiments rudimentaires.<\/p>\n<p>L\u2019origine de ces ance\u0302tres plonge dans la chimie de la Terre primitive. De\u0300s 1953, l\u2019expe\u0301rience chimistes ame\u0301ricains Harold Urey et Stanley Miller a montre\u0301 que des mole\u0301cules simples (eau, me\u0301thane, ammoniac, hydroge\u0300ne) pouvaient spontane\u0301ment produire des acides amine\u0301s dans des conditions simulant l\u2019atmosphe\u0300re primitive. Progressivement, les assemblages les plus stables ont gagne\u0301 en complexite\u0301, donnant naissance a\u0300 des polyme\u0300res comme l\u2019ARN et les prote\u0301ines, capables d\u2019interagir et de se reproduire imparfaitement. L\u2019encapsulation de ces syste\u0300mes dans des membranes d\u2019acides gras a constitue\u0301 une e\u0301tape cle\u0301: la naissance de proto-cellules, prote\u0301ge\u0301es du milieu exte\u0301rieur et soumises a\u0300 une se\u0301lection darwinienne.<\/p>\n<p><b>\u00ab Luca restera tre\u0300s myste\u0301rieux \u00bb<\/b><\/p>\n<p>Dans cette perspective, Luca apparai\u0302t comme l\u2019he\u0301ritier d\u2019un monde pre\u0301-cellulaire foisonnant, ou\u0300 la frontie\u0300re entre chimie et biologie e\u0301tait encore floue. Son me\u0301tabolisme reposait probablement sur des re\u0301actions chimiques de\u0301ja\u0300 pre\u0301sentes dans l\u2019environnement, notamment dans des oce\u0301ans riches en dioxyde de carbone et en me\u0301thane, de\u0301pourvus d\u2019oxyge\u0300ne mais e\u0301nerge\u0301tiquement favorables. En inte\u0301grant ces re\u0301actions naturelles, ses ance\u0302tres ont progressivement transforme\u0301 la chimie du monde en biologie. \u00ab Luca restera tre\u0300s myste\u0301rieux&#8230; a\u0300 moins d\u2019inventer une machine pour voyager dans le temps \u00ab , re\u0301sume Patrick Forterre. L\u2019e\u0301bauche du portrait de notre lointain ance\u0302tre gagnera su\u0302rement en pre\u0301cision, mais elle ne sera jamais une photo de haute re\u0301solution.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">Senegal<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Senegal. De la plus petite bacte\u0301rie aux plus grands des mammife\u0300res, tous les e\u0302tres vivants appartiennent a\u0300 une seule et me\u0302me ligne\u0301e. Cette ide\u0301e, aujourd\u2019hui solidement e\u0301tablie, converge vers un ance\u0302tre commun universel: Luca, pour \u00ab Last Universal Common Ancestor \u00bb. Il ne s\u2019agit pas du premier e\u0302tre vivant, mais du dernier ance\u0302tre [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":74588,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[44],"class_list":["post-74589","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-senegal-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Origine de Luca, Ance\u0302Tre de Tous les E\u0302Tres Vivants - Senegal<\/title>\n<meta name=\"description\" content=\"De la plus petite bacte\u0301rie aux plus grands des mammife\u0300res, tous les e\u0302tres vivants appartiennent a\u0300 une seule et me\u0302me ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Origine de Luca, Ance\u0302Tre de Tous les E\u0302Tres Vivants\" \/>\n<meta property=\"og:description\" content=\"De la plus petite bacte\u0301rie aux plus grands des mammife\u0300res, tous les e\u0302tres vivants appartiennent a\u0300 une seule et me\u0302me ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants\" \/>\n<meta property=\"og:site_name\" content=\"Senegal\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-04T12:00:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-05T01:37:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2026\/02\/sm_1770283682.299406.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Origine de Luca, Ance\u0302Tre de Tous les E\u0302Tres Vivants\",\"datePublished\":\"2026-02-04T12:00:00+00:00\",\"dateModified\":\"2026-02-05T01:37:45+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants\"},\"wordCount\":821,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/senegal\/sites\/13\/2026\/02\/sm_1770283682.299406.jpg\",\"keywords\":[\"Senegal\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants\",\"url\":\"https:\/\/www.africa-press.net\/senegal\/toutes-les-actualites\/origine-de-luca-ancetre-de-tous-les-etres-vivants\",\"name\":\"Origine de Luca, Ance\u0302Tre de Tous les E\u0302Tres Vivants - 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