{"id":22250,"date":"2021-03-30T14:15:53","date_gmt":"2021-03-30T13:15:53","guid":{"rendered":"https:\/\/www.laterredufutur.com\/accueil\/?p=22250"},"modified":"2021-03-30T14:20:49","modified_gmt":"2021-03-30T13:20:49","slug":"les-premiers-migrants-sud-americains-avaient-une-ascendance-indigene-australienne-et-melanesienne","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/les-premiers-migrants-sud-americains-avaient-une-ascendance-indigene-australienne-et-melanesienne\/","title":{"rendered":"Les premiers migrants sud-am\u00e9ricains avaient une ascendance indig\u00e8ne australienne et m\u00e9lan\u00e9sienne"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p>L&rsquo;\u00e9tendue de l&rsquo;influence australasienne dans les anciennes lign\u00e9es des premi\u00e8res cultures sud-am\u00e9ricaines semble \u00eatre encore plus grande que ne le pensaient les scientifiques, selon de nouvelles recherches.<\/p>\n<p>En 2015, deux \u00e9tudes scientifiques ont identifi\u00e9 un lien intrigant : des preuves de la g\u00e9n\u00e9tique indig\u00e8ne australienne, m\u00e9lan\u00e9sienne et sud-asiatique int\u00e9gr\u00e9e dans les populations am\u00e9rindiennes modernes vivant en Amazonie.<\/p>\n<p>La fa\u00e7on dont cette connexion myst\u00e9rieuse a \u00e9t\u00e9 forg\u00e9e entre des peuples vivant dans un globe \u00e0 part n&rsquo;a jamais \u00e9t\u00e9 enti\u00e8rement comprise ou accept\u00e9e, bien que l&rsquo;on pense que les g\u00e8nes australasiens se sont d\u00e9vers\u00e9s dans les Am\u00e9riques via une migration terrestre \u00e9pique \u00e0 travers l&rsquo;Eurasie il y a environ 20000 ans, \u00e0 l&rsquo;\u00e9poque, la masse continentale maintenant submerg\u00e9e de la B\u00e9ringie servait toujours de pont vers l&rsquo;Alaska.<\/p>\n<figure id=\"attachment_22252\" aria-describedby=\"caption-attachment-22252\" style=\"width: 708px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22252\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/les-premiers-migrants-sud-americains-avaient-une-ascendance-indigene-australienne-et-melanesienne\/beringie\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/Beringie.jpg?fit=708%2C884&amp;ssl=1\" data-orig-size=\"708,884\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"B\u00e9ringie\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;credit wikiwand&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/Beringie.jpg?fit=641%2C800&amp;ssl=1\" class=\"size-full wp-image-22252\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/Beringie.jpg?resize=708%2C884&#038;ssl=1\" alt=\"\" width=\"708\" height=\"884\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/Beringie.jpg?w=708&amp;ssl=1 708w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/Beringie.jpg?resize=240%2C300&amp;ssl=1 240w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/Beringie.jpg?resize=641%2C800&amp;ssl=1 641w\" sizes=\"auto, (max-width: 708px) 100vw, 708px\" \/><figcaption id=\"caption-attachment-22252\" class=\"wp-caption-text\">credit wikiwand<\/figcaption><\/figure>\n<p>Il y a environ 15 000 ans, certains des voyageurs s&rsquo;\u00e9taient rendus jusqu&rsquo;en Am\u00e9rique du Sud, o\u00f9 les g\u00e8nes australasiens peuvent encore \u00eatre trouv\u00e9s dans le sang des groupes autochtones amazoniens d&rsquo;aujourd&rsquo;hui.<\/p>\n<p>Mais tous ceux qui ont voyag\u00e9 ne se sont pas n\u00e9cessairement install\u00e9s dans la for\u00eat tropicale. Une nouvelle \u00e9tude sugg\u00e8re que la contribution australasienne au pool g\u00e9n\u00e9tique am\u00e9rindien d&rsquo;Am\u00e9rique du Sud avait une port\u00e9e plus large que nous ne le pensions.<\/p>\n<p>L&rsquo;une des caract\u00e9ristiques pr\u00e9c\u00e9demment identifi\u00e9es de l&rsquo;influence australasienne en Am\u00e9rique du Sud est ce que l&rsquo;on appelle le signal de la \u00ab\u00a0population Ypiku\u00e9ra\u00a0\u00bb (signal Y) &#8211; une variante g\u00e9n\u00e9tique jusqu&rsquo;\u00e0 pr\u00e9sent observ\u00e9e uniquement dans les populations amazoniennes actuelles.<\/p>\n<p>Cependant, ce signal a \u00e9t\u00e9 observ\u00e9 en dehors de l&rsquo;Amazonie mais aussi ailleurs en Am\u00e9rique du Sud, avec une analyse g\u00e9nomique comprenant 383 individus d&rsquo;un certain nombre de groupes indig\u00e8nes r\u00e9v\u00e9lant que le signal Y existe non seulement dans les groupes amazoniens &#8211; mais aussi chez les indig\u00e8nes, peuples de Chotuna (vivant pr\u00e8s de la c\u00f4te pacifique du P\u00e9rou), Guaran\u00ed Kaiow\u00e1 (centre-ouest du Br\u00e9sil) et Xav\u00e1nte (pr\u00e8s du centre du Br\u00e9sil).<\/p>\n<p>&lt;&lt; Nos r\u00e9sultats ont montr\u00e9 que le signal g\u00e9n\u00e9tique australasien, pr\u00e9c\u00e9demment d\u00e9crit comme exclusif aux groupes amazoniens, a \u00e9galement \u00e9t\u00e9 identifi\u00e9 dans la population c\u00f4ti\u00e8re du Pacifique, indiquant une distribution du signal plus r\u00e9pandue en Am\u00e9rique du Sud et impliquant peut-\u00eatre un contact ancien entre les habitants du Pacifique et de l&rsquo;Amazonie, \u00ab\u00a0Les chercheurs, dirig\u00e9s par le premier auteur et biologiste \u00e9volutionniste Marcos Ara\u00fajo Castro e Silva de l&rsquo;Universit\u00e9 de S\u00e3o Paulo (USP) au Br\u00e9sil, <a href=\"https:\/\/www.pnas.org\/content\/118\/14\/e2025739118\" target=\"_blank\" rel=\"noopener\">expliquent dans leur \u00e9tude<\/a> .<\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<figure id=\"attachment_22255\" aria-describedby=\"caption-attachment-22255\" style=\"width: 900px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22255\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/les-premiers-migrants-sud-americains-avaient-une-ascendance-indigene-australienne-et-melanesienne\/origine-adn-ameriquedusud-australie\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?fit=900%2C512&amp;ssl=1\" data-orig-size=\"900,512\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"origine-adn-ameriquedusud-australie\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Affinit\u00e9s g\u00e9n\u00e9tiques profondes entre l&amp;rsquo;Am\u00e9rique du Sud et les Australasiens (N\u00e9o-Guin\u00e9ens, Australiens et Onge des \u00eeles Andaman). Les couleurs plus chaudes indiquent les affinit\u00e9s les plus fortes. Image: Pontus Skoglund, \u00c9cole de m\u00e9decine de Harvard&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?fit=800%2C455&amp;ssl=1\" class=\"size-full wp-image-22255\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?resize=900%2C512&#038;ssl=1\" alt=\"\" width=\"900\" height=\"512\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?w=900&amp;ssl=1 900w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?resize=300%2C171&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?resize=800%2C455&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?resize=768%2C437&amp;ssl=1 768w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/origine-adn-ameriquedusud-australie.jpg?resize=174%2C98&amp;ssl=1 174w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><figcaption id=\"caption-attachment-22255\" class=\"wp-caption-text\">Affinit\u00e9s g\u00e9n\u00e9tiques profondes entre l&rsquo;Am\u00e9rique du Sud et les Australasiens (N\u00e9o-Guin\u00e9ens, Australiens et Onge des \u00eeles Andaman). Les couleurs plus chaudes indiquent les affinit\u00e9s les plus fortes. Image: Pontus Skoglund, \u00c9cole de m\u00e9decine de Harvard<\/figcaption><\/figure>\n<p>En plus de sugg\u00e9rer que la signature g\u00e9n\u00e9tique australasienne s&rsquo;est r\u00e9pandue au sein des populations am\u00e9rindiennes de la c\u00f4te au centre de l&rsquo;Am\u00e9rique du Sud, les nouvelles d\u00e9couvertes indiquent qu&rsquo;au moins deux vagues migratoires se sont probablement produites, avec une branche de personnes avec la variation Y s&rsquo;installant dans le Pacifique, r\u00e9gions c\u00f4ti\u00e8res, avant qu&rsquo;un autre groupe ayant la m\u00eame ascendance australasienne ait ensuite migr\u00e9 vers l&rsquo;est, habitant l&rsquo;Amazonie et le centre du Br\u00e9sil.<\/p>\n<p>Quant \u00e0 savoir comment le signal Y n&rsquo;a pas \u00e9t\u00e9 capt\u00e9 au nord de l&rsquo;Am\u00e9rique du Sud &#8211; m\u00eame si ces anciens migrants ont d\u00fb traverser ce territoire une fois &#8211; il est possible qu&rsquo;en s&rsquo;en tenant \u00e0 la route c\u00f4ti\u00e8re du Pacifique, aux lign\u00e9es des migrants et \u00e0 la g\u00e9n\u00e9tique australasienne composante qu&rsquo;ils transportaient, il se peut qu&rsquo;ils ne se soient pas compl\u00e8tement m\u00e9lang\u00e9s avec les populations contemporaines d&rsquo;Am\u00e9rique du Nord et centrale.<\/p>\n<p>Une autre possibilit\u00e9, comme T\u00e1bita H\u00fcnemeier, auteur principal et g\u00e9n\u00e9ticien \u00e9volutionniste de l&rsquo;USP, l&rsquo;a dit \u00e0 <a href=\"https:\/\/www.sciencemag.org\/news\/2021\/03\/earliest-south-american-migrants-had-australian-melanesian-ancestry\" target=\"_blank\" rel=\"noopener\">Science<\/a> , est que ceux qui portent la variante Y en Am\u00e9rique du Nord et centrale n&rsquo;ont tout simplement pas surv\u00e9cu aux transitions violentes de la colonisation europ\u00e9enne.<\/p>\n<p>Il se peut \u00e9galement que le signal Y n&rsquo;ait tout simplement pas \u00e9t\u00e9 suffisamment recherch\u00e9 dans les populations situ\u00e9es plus au nord. Comme le montrent ces d\u00e9couvertes en cours, ce n&rsquo;est peut-\u00eatre qu&rsquo;une question de temps et de tests suppl\u00e9mentaires avant que davantage de ces connexions anciennes et surprenantes ne soient connues.<\/p>\n<p>Les r\u00e9sultats sont rapport\u00e9s dans <a href=\"https:\/\/www.pnas.org\/content\/118\/14\/e2025739118\" target=\"_blank\" rel=\"noopener\">PNAS<\/a>.<\/p>\n<figure id=\"attachment_22253\" aria-describedby=\"caption-attachment-22253\" style=\"width: 960px\" class=\"wp-caption alignnone\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" data-attachment-id=\"22253\" data-permalink=\"https:\/\/www.laterredufutur.com\/accueil\/les-premiers-migrants-sud-americains-avaient-une-ascendance-indigene-australienne-et-melanesienne\/cote-peruvienne\/\" data-orig-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?fit=960%2C532&amp;ssl=1\" data-orig-size=\"960,532\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;9&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;DMC-GX8&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;14&quot;,&quot;iso&quot;:&quot;200&quot;,&quot;shutter_speed&quot;:&quot;0.0015625&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"cote-peruvienne\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Pixabay License&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?fit=800%2C443&amp;ssl=1\" class=\"size-full wp-image-22253\" src=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?resize=960%2C532&#038;ssl=1\" alt=\"\" width=\"960\" height=\"532\" srcset=\"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?w=960&amp;ssl=1 960w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?resize=300%2C166&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?resize=800%2C443&amp;ssl=1 800w, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/cote-peruvienne.jpg?resize=768%2C426&amp;ssl=1 768w\" sizes=\"auto, (max-width: 960px) 100vw, 960px\" \/><figcaption id=\"caption-attachment-22253\" class=\"wp-caption-text\">Pixabay License<\/figcaption><\/figure>\n<p>Adaptation <a href=\"https:\/\/www.laterredufutur.com\/accueil\/\" target=\"_blank\" rel=\"noopener\">Terra Projects<\/a><\/p>\n<p>Source : <a href=\"https:\/\/www.sciencealert.com\/the-genetic-signal-of-ancient-australians-in-south-america-goes-deeper-than-we-knew\" target=\"_blank\" rel=\"noopener\">https:\/\/www.sciencealert.com\/<\/a><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"22250\">(447)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>L&rsquo;\u00e9tendue de l&rsquo;influence australasienne dans les anciennes lign\u00e9es des premi\u00e8res cultures sud-am\u00e9ricaines semble \u00eatre encore plus grande que ne le&#8230;<\/p>\n","protected":false},"author":1,"featured_media":22251,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[33],"tags":[954,6626,3700,221,2842,251],"class_list":["post-22250","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-archeologie","tag-adn","tag-amerindiens","tag-amerique-du-sud","tag-australie","tag-indiens","tag-origine","wpcat-33-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2021\/03\/pirogue-ocean-pacifique.jpg?fit=1280%2C720&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-5MS","jetpack-related-posts":[{"id":21098,"url":"https:\/\/www.laterredufutur.com\/accueil\/les-polynesiens-et-les-amerindiens-se-sont-rencontres-avant-larrivee-des-europeens-selon-une-etude-genetique\/","url_meta":{"origin":22250,"position":0},"title":"Les Polyn\u00e9siens et les Am\u00e9rindiens se sont rencontr\u00e9s avant l&rsquo;arriv\u00e9e des Europ\u00e9ens, selon une \u00e9tude g\u00e9n\u00e9tique","author":"Admin","date":"23 juillet 2020","format":false,"excerpt":"Gr\u00e2ce \u00e0 des analyses g\u00e9n\u00e9tiques approfondies, les scientifiques de Stanford Medicine et leurs collaborateurs ont trouv\u00e9 des preuves scientifiques concluantes du contact entre les anciens Polyn\u00e9siens et les Am\u00e9rindiens de la r\u00e9gion qui est aujourd'hui la Colombie - c'\u00e9tait vivement contest\u00e9 dans le monde historique et arch\u00e9ologique depuis des d\u00e9cennies.\u2026","rel":"","context":"Dans &quot;Arch\u00e9ologie&quot;","block_context":{"text":"Arch\u00e9ologie","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/archeologie\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/07\/moai-iledepaques.jpg?fit=1024%2C576&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/07\/moai-iledepaques.jpg?fit=1024%2C576&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/07\/moai-iledepaques.jpg?fit=1024%2C576&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2020\/07\/moai-iledepaques.jpg?fit=1024%2C576&ssl=1&resize=700%2C400 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