{"id":5777,"date":"2025-09-08T06:55:33","date_gmt":"2025-09-08T06:55:33","guid":{"rendered":"https:\/\/scientificworld.org\/?p=5777"},"modified":"2025-09-08T06:55:37","modified_gmt":"2025-09-08T06:55:37","slug":"maternal-iron-levels-crucial-for-male-sex-determination-in-embryos","status":"publish","type":"post","link":"https:\/\/scientificworld.org\/?p=5777","title":{"rendered":"Maternal Iron Levels Crucial for Male Sex Determination in Embryos"},"content":{"rendered":"\n<p>A groundbreaking study from the University of Osaka, published in&nbsp;<a href=\"http:\/\/dx.doi.org\/10.1038\/s41586-025-09063-2\"><em>Nature<\/em><\/a>, has uncovered that maternal iron levels play a pivotal role in male sex determination in mammalian embryos. Researchers found that iron deficiency disrupts the activation of the&nbsp;<em>Sry<\/em>&nbsp;gene, essential for testis formation, leading to sex reversal in genetically male (XY) mice. This discovery highlights the importance of maternal nutrition during pregnancy for healthy embryonic development.<\/p>\n\n\n\n<p>The&nbsp;<em>Sry<\/em>&nbsp;gene, located on the Y chromosome, initiates testis development by removing a specific histone methylation mark, a process dependent on the iron-requiring enzyme KDM3A. The team demonstrated that mice lacking&nbsp;<em>Tfrc<\/em>, a gene vital for iron uptake, exhibited reduced&nbsp;<em>Sry<\/em>&nbsp;expression due to impaired KDM3A activity. Remarkably, some XY mice developed female genitalia, underscoring iron\u2019s role in sex determination.<\/p>\n\n\n\n<p>Using an organ culture system, the researchers confirmed that low iron levels directly suppressed KDM3A\u2019s function, preventing&nbsp;<em>Sry<\/em>&nbsp;activation. Even more striking, maternal iron deficiency\u2014whether from diet or drugs\u2014replicated these effects, causing male-to-female sex reversal in offspring.<\/p>\n\n\n\n<p>\u201cIron deficiency disrupts male development by hindering&nbsp;<em>Sry<\/em>&nbsp;activation,\u201d explained lead author Naoki Okashita. Senior author Makoto Tachibana added, \u201cOur findings stress the critical need for adequate maternal iron intake to ensure proper embryonic development.\u201d<\/p>\n\n\n\n<p>The study underscores iron\u2019s vital role in sex determination and suggests implications for human health, particularly in conditions like Fanconi anemia, where iron metabolism is affected. Future research may explore interventions to mitigate developmental disorders linked to maternal iron deficiency.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A groundbreaking study from the University of Osaka, published in&nbsp;Nature, has uncovered that maternal iron levels play a pivotal role in male sex determination in mammalian embryos. Researchers found that iron deficiency disrupts the activation of the&nbsp;Sry&nbsp;gene, essential for testis formation, leading to sex reversal in genetically male (XY) mice. This discovery highlights the importance [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2051],"tags":[2052,3532,3530,871,3528,3531],"class_list":["post-5777","post","type-post","status-publish","format-standard","hentry","category-developmental-biology","tag-developmental-biology","tag-embryonic-development","tag-embryos","tag-iron","tag-maternal-iron","tag-sry-gene"],"_links":{"self":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts\/5777","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5777"}],"version-history":[{"count":1,"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts\/5777\/revisions"}],"predecessor-version":[{"id":5778,"href":"https:\/\/scientificworld.org\/index.php?rest_route=\/wp\/v2\/posts\/5777\/revisions\/5778"}],"wp:attachment":[{"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/scientificworld.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}