{"id":223653,"date":"2020-09-02T09:43:23","date_gmt":"2020-09-02T09:43:23","guid":{"rendered":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/?p=223653"},"modified":"2020-09-02T09:43:25","modified_gmt":"2020-09-02T09:43:25","slug":"etude-les-hommes-pourraient-disparaitre-car-le-chromosome-y-est-entrain-de-seteindre","status":"publish","type":"post","link":"https:\/\/afrikmag.com\/var\/www\/vhosts\/afrikmag.compublic_html\/etude-les-hommes-pourraient-disparaitre-car-le-chromosome-y-est-entrain-de-seteindre\/","title":{"rendered":"\u00c9tude : les hommes pourraient dispara\u00eetre car le chromosome Y est entrain de s\u2019\u00e9teindre"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Le\u00a0chromosome Y d\u00e9terminant les m\u00e2les pourrait \u00eatre en train de s&rsquo;\u00e9teindre, ce qui incite \u00e0 discuter de la possibilit\u00e9 que les hommes disparaissent avec lui.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le sexe d&rsquo;une personne est d\u00e9termin\u00e9 par le fait qu&rsquo;elle a deux chromosomes X (ce qui provoque le d\u00e9veloppement des ovaires) ou un X et un Y (qui se traduit par des testicules).\u00a0Sur les deux, X a environ 1000 g\u00e8nes tandis que Y n&rsquo;en a que 45 et la recherche indique que le chromosome Y r\u00e9tr\u00e9cit progressivement encore plus.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les g\u00e8nes d\u00e9veloppent des mutations au fil du temps, dont certaines sont nocives.\u00a0Le chromosome peut \u00e9viter de transmettre de telles mutations nocives en se m\u00e9langeant et en s&rsquo;associant pendant la m\u00e9iose &#8211; le stade du d\u00e9veloppement f\u0153tal au cours duquel nos corps en formation d\u00e9veloppent des spermatozo\u00efdes ou des ovules.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce processus brise les g\u00e8nes et augmente la probabilit\u00e9 que seuls les g\u00e8nes forts et non nocifs soient transmis.\u00a0Cependant, seuls les chromosomes X peuvent s&rsquo;\u00e9changer les uns avec les autres, tandis que Y n&rsquo;est pas assez similaire pour se combiner, indique l&rsquo;\u00e9tude.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Parce que les individus n&rsquo;ont pas (g\u00e9n\u00e9ralement) deux chromosomes Y, Y ne peut pas se recombiner avec lui-m\u00eame et ainsi il diminue depuis plusieurs millions d&rsquo;ann\u00e9es. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les recherches men\u00e9es par Jennifer Graves, g\u00e9n\u00e9ticienne \u00e0 l&rsquo;Universit\u00e9 La Trobe de Melbourne, r\u00e9v\u00e8lent qu&rsquo;il y a 166 millions d&rsquo;ann\u00e9es, le chromosome Y avait un nombre similaire de g\u00e8nes que X, soit environ 1669.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c<em>Il ne faut donc pas un grand cerveau pour se rendre compte que si le taux de perte est uniforme &#8211; 10 g\u00e8nes par million d&rsquo;ann\u00e9es &#8211; et qu&rsquo;il ne nous en reste que 45, le Y entier dispara\u00eetra dans 4,5 millions d&rsquo;ann\u00e9es<\/em>\u00ab\u00a0, a-t-elle d\u00e9clar\u00e9 \u00e0 Live&nbsp;&nbsp;Science.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les recherches indiquent que le taux de d\u00e9gradation a ralenti au fil du temps et que le chromosome Y, humain n&rsquo;a perdu qu&rsquo;un seul g\u00e8ne depuis que les humains et les singes rh\u00e9sus ont diverg\u00e9 il y a 25 millions d&rsquo;ann\u00e9es.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;Mais perdre compl\u00e8tement le chromosome Y est toujours une possibilit\u00e9, comme cela est arriv\u00e9 \u00e0 d&rsquo;autres esp\u00e8ces, y compris les rongeurs souterrains appel\u00e9s campagnols, ainsi que certaines esp\u00e8ces de rats \u00e9pineux au Japon.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cela ne signifie pas n\u00e9cessairement que les hommes sont condamn\u00e9s, car la perte du chromosome Y n&rsquo;efface pas le sexe masculin d&rsquo;une esp\u00e8ce, comme exemple les rats \u00e9pineux et les campagnols ont encore des m\u00e2les et des femelles.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c<em>Les gens pensent que le sexe est en quelque sorte une chose tr\u00e8s d\u00e9termin\u00e9e<\/em>\u00bb, a d\u00e9clar\u00e9 Rasmus Nielsen, g\u00e9n\u00e9ticien \u00e0 l&rsquo;Universit\u00e9 de Californie \u00e0 Berkeley.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c<em>Que si vous avez un chromosome Y, alors vous \u00eates un homme, ou vous n&rsquo;avez pas de chromosome Y, alors vous \u00eates une femme.\u00a0Mais \u00e7a ne marche pas comme \u00e7a.\u00a0<\/em>\u00ab\u00a0<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">En v\u00e9rit\u00e9, 95% des g\u00e8nes exprim\u00e9s diff\u00e9remment entre les hommes et les femmes ne vivent pas r\u00e9ellement sur les chromosomes X et Y.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201c<em>Perdre le chromosome Y ne signifie pas perdre le m\u00e2le\u00a0\u00bb,<\/em>&nbsp;a expliqu\u00e9 Nielsen.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Si le chromosome Y devait dispara\u00eetre, un autre g\u00e8ne deviendrait probablement le principal d\u00e9terminant du sexe au cours du d\u00e9veloppement humain.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le\u00a0chromosome Y d\u00e9terminant les m\u00e2les pourrait \u00eatre en train de s&rsquo;\u00e9teindre, ce qui incite \u00e0 discuter de la possibilit\u00e9 que les hommes disparaissent avec lui. Le sexe d&rsquo;une personne est d\u00e9termin\u00e9 par le fait qu&rsquo;elle a deux chromosomes X (ce qui provoque le d\u00e9veloppement des ovaires) ou un X et un Y (qui se traduit &hellip;<\/p>\n","protected":false},"author":37,"featured_media":223670,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7220,7020],"tags":[141330,1881,1403],"class_list":["post-223653","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","category-societe","tag-chromosome-y","tag-disparition","tag-hommes"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u00c9tude: les hommes pourraient dispara\u00eetre car le chromosome Y est entrain de s\u2019\u00e9teindre<\/title>\n<meta name=\"description\" content=\"Le chromosome Y pourrait \u00eatre en train de s&#039;\u00e9teindre, ce qui 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