{"id":193347,"date":"2025-06-21T11:29:09","date_gmt":"2025-06-21T11:29:09","guid":{"rendered":"https:\/\/www.europesays.com\/fr\/193347\/"},"modified":"2025-06-21T11:29:09","modified_gmt":"2025-06-21T11:29:09","slug":"une-forte-carence-en-fer-pendant-la-gestation-peut-affecter-le-developpement-sexuel-des-males","status":"publish","type":"post","link":"https:\/\/www.europesays.com\/fr\/193347\/","title":{"rendered":"Une forte carence en fer pendant la gestation peut affecter le d\u00e9veloppement sexuel des m\u00e2les"},"content":{"rendered":"

Des chercheurs ont montr\u00e9, chez la souris, qu\u2019un fort manque de fer pouvait entra\u00eener des anomalies du d\u00e9veloppement sexuel. Parfois jusqu\u2019\u00e0 provoquer une inversion compl\u00e8te du sexe des embryons.<\/p>\n

XX pour les femelles, XY pour les m\u00e2les\u00a0: ce n\u2019est pas un scoop, chez les mammif\u00e8res ce sont les\u00a0chromosomes<\/a>\u00a0sexuels dont h\u00e9rite l\u2019embryon qui d\u00e9terminent son sexe. Et en particulier l\u2019expression du g\u00e8ne SRY, pr\u00e9sent sur\u00a0le chromosome Y<\/a>\u00a0(m\u00e2le), qui favorise la croissance des\u00a0testicules<\/a>\u00a0; \u00e0 d\u00e9faut, l\u2019embryon suit naturellement une trajectoire f\u00e9minine. Ainsi, il a toujours \u00e9t\u00e9 admis que la d\u00e9termination du sexe chez les mammif\u00e8res \u00e9tait strictement d\u00e9pendante de la g\u00e9n\u00e9tique, tandis que\u00a0chez les tortues<\/a>\u00a0et les crocodiles par exemple c\u2019est la temp\u00e9rature \u00e0 laquelle les embryons se d\u00e9veloppent qui guide ce processus. Mais chez les mammif\u00e8res, les facteurs environnementaux pourraient en fait jouer un r\u00f4le bien plus important qu\u2019on ne le pensait.<\/p>\n

En effet, des scientifiques japonais montrent,\u00a0dans la revue Nature<\/a> , qu\u2019une s\u00e9v\u00e8re carence maternelle\u00a0en fer<\/a>\u00a0pendant la gestation pouvait influencer la diff\u00e9renciation sexuelle de l\u2019embryon, jusqu\u2019au d\u00e9veloppement d\u2019ovaires chez des souris g\u00e9n\u00e9tiquement\u2026<\/p>\n

\n Cet article est r\u00e9serv\u00e9 aux abonn\u00e9s. Il vous reste 81% \u00e0 d\u00e9couvrir.\n <\/p>\n

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3,99\u20ac par mois pendant 12 mois. Sans engagement.<\/p>\n

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