{"id":59843,"date":"2024-02-29T16:31:46","date_gmt":"2024-02-29T16:31:46","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/le-genome-des-papillons-na-pratiquement-pas-change-en-250-millions-dannees-devolution"},"modified":"2024-02-29T17:28:32","modified_gmt":"2024-02-29T17:28:32","slug":"le-genome-des-papillons-na-pratiquement-pas-change-en-250-millions-dannees-devolution","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/le-genome-des-papillons-na-pratiquement-pas-change-en-250-millions-dannees-devolution","title":{"rendered":"Le g\u00e9nome des papillons n\u2019a pratiquement pas chang\u00e9 en 250 millions d\u2019ann\u00e9es d\u2019\u00e9volution"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Tchad. <\/strong><\/span>Les papillons, avec plus de 165.000 espe\u0300ces de\u0301crites, constituent l\u2019un des groupes d\u2019insectes les mieux connus du monde. Si l\u2019origine de ces insectes aile\u0301s remonte a\u0300 bien avant la disparition des dinosaures, leur ge\u0301nome est reste\u0301 largement inchange\u0301, et ce malgre\u0301 l\u2019e\u0301norme diversite\u0301 des espe\u0300ces.<\/p>\n<p>C\u2019est l\u2019e\u0301tonnante de\u0301couverte re\u0301alise\u0301e par une e\u0301quipe de scientifiques britanniques qui, en retrac\u0327ant le code ge\u0301ne\u0301tique des tout premiers papillons, a identifie\u0301 32 chromosomes ancestraux comme e\u0301le\u0301ments constitutifs de la quasi-totalite\u0301 des le\u0301pidopte\u0300res. Leurs recherches, publie\u0301es dans la revue Nature Ecology and Evolution le 21 fe\u0301vrier 2024, offrent un nouvel e\u0301clairage sur l\u2019histoire e\u0301volutive des papillons.<\/p>\n<p><b>32 chromosomes reste\u0301s intacts depuis 250 millions d&rsquo;anne\u0301es<\/b><\/p>\n<p>Pour aboutir a\u0300 ces re\u0301sultats, la doctorante au centre Wellcome Sanger Institute, Charlotte Wright, et son e\u0301quipe ont recueilli et e\u0301tudie\u0301 les donne\u0301es de 210 espe\u0300ces de papillons diurnes et nocturnes provenant du monde entier. Parmi celles-ci, l\u2019Argus bleu-nacre\u0301 (Lysandra coridon), la Pie\u0301ride de l&rsquo;Aube\u0301pine (Aporia crataegi) ou encore la Phale\u0300ne brumeuse (Operophtera brumata).<\/p>\n<p>En conjuguant se\u0301quenc\u0327age et assemblage, les chercheurs ont identifie\u0301 32 chromosomes ancestraux, qu\u2019ils ont baptise\u0301s les \u00ab\u00a0e\u0301le\u0301ments de Merian\u00a0\u00bb, en re\u0301fe\u0301rence a\u0300 Maria Sibylla Merian, une entomologiste allemande pionnie\u0300re du 17e sie\u0300cle. Ces chromosomes sont non seulement communs a\u0300 tous les papillons de jour et de nuit se\u0301lectionne\u0301s, mais ils sont aussi reste\u0301s intacts chez la majorite\u0301 d\u2019entre eux depuis leur dernier ance\u0302tre commun, vieux de plus de 250 millions d\u2019anne\u0301es.<\/p>\n<p>\u201cNous avons e\u0301te\u0301 impressionne\u0301s de constater a\u0300 quel point la structure du ge\u0301nome des papillons diurnes et nocturnes est reste\u0301e stable sur une pe\u0301riode de temps aussi longue\u201d, s\u2019enthousiasme aupre\u0300s de Sciences et Avenir Charlotte Wright, doctorante et autrice principale de l\u2019e\u0301tude.<\/p>\n<p><b>Fusion et fission chez les papillons<\/b><\/p>\n<p>En reconstruisant l\u2019arbre phyloge\u0301ne\u0301tique des le\u0301pidopte\u0300res, les chercheurs ont e\u0301galement constate\u0301 que certains groupes d\u2019espe\u0300ces avaient de\u0301fie\u0301 ces contraintes de structure du ge\u0301nome et e\u0301volue\u0301 vers des re\u0301arrangements chromosomiques radicalement diffe\u0301rents, par fission et par fusion.<\/p>\n<p>C\u2019est notamment le cas des papillons appartenant au genre Pieris, comme la Pie\u0301ride du Chou (Pieris brassicae) ou la Pie\u0301ride de la Rave (Pieris rapae), dont les ge\u0301nomes ont e\u0301te\u0301 fragmente\u0301s puis re\u0301organise\u0301s il y a environ 35 millions d\u2019anne\u0301es. Les ge\u0301nomes des papillons appartenant au genre Lysandra, comme l\u2019Azure\u0301 bleu ce\u0301leste (Lysandra bellargus), eux, se sont re\u0301organise\u0301s plus re\u0301cemment, il y a environ 5 millions d\u2019anne\u0301es.<\/p>\n<p>\u00ab\u00a0Avec une telle quantite\u0301 de donne\u0301es se\u0301quence\u0301es et assemble\u0301es a\u0300 large e\u0301chelle, cette e\u0301tude offre une meilleure compre\u0301hension du processus e\u0301volutif des papillons, et ouvre la voie a\u0300 de nouvelles recherches\u00a0\u00bb, nous explique Violaine Llaurens, directrice de recherche CNRS et biologiste de l\u2019e\u0301volution au CIRB, qui n\u2019a pas participe\u0301 a\u0300 ces travaux.<\/p>\n<p>A\u0300 l\u2019avenir, les chercheurs britanniques espe\u0300rent trouver des indices supple\u0301mentaires dans les rares groupes qui ont e\u0301chappe\u0301 aux re\u0300gles de structure du ge\u0301nome. \u00ab\u00a0Ces re\u0301sultats ne sont qu\u2019un de\u0301but pour de\u0301couvrir a\u0300 quel point la diversite\u0301 ge\u0301ne\u0301tique chez les le\u0301pidopte\u0300res et les facteurs qui la sous-tendent pourrait aider la pre\u0301servation des espe\u0300ces\u00a0\u00bb, conclut Charlotte Wright.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/tchad\">Tchad<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. Les papillons, avec plus de 165.000 espe\u0300ces de\u0301crites, constituent l\u2019un des groupes d\u2019insectes les mieux connus du monde. Si l\u2019origine de ces insectes aile\u0301s remonte a\u0300 bien avant la disparition des dinosaures, leur ge\u0301nome est reste\u0301 largement inchange\u0301, et ce malgre\u0301 l\u2019e\u0301norme diversite\u0301 des espe\u0300ces. C\u2019est l\u2019e\u0301tonnante de\u0301couverte re\u0301alise\u0301e par une e\u0301quipe [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":59842,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37,292,29],"class_list":["post-59843","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"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>Le g\u00e9nome des papillons n\u2019a pratiquement pas chang\u00e9 en 250 millions d\u2019ann\u00e9es d\u2019\u00e9volution - tchad<\/title>\n<meta name=\"description\" content=\"Les papillons, avec plus de 165.000 espe\u0300ces de\u0301crites, constituent l\u2019un des groupes 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