Anti-Müllerian hormone
mammalian protein found in Homo sapiens
Anti-Müllerian hormone (AMH), also known as Müllerian-inhibiting factor (MIF), is a protein that in humans is encoded by the AMH gene.
AMH is a glycoprotein hormone that belongs to the transforming growth factor beta (TGF-β) superfamily, which also includes inhibin and activin. These hormones play important roles in cell growth and development, sex differentiation in males, and the formation of ovarian follicles. In humans, the AMH gene is located on chromosome 19p13.3, while its receptor is encoded by the AMHR2 gene on chromosome 12.
In male embryos, AMH is switched on by the SOX9 gene in Sertoli cells of the developing testes. AMH acts to block the development of the Müllerian ducts (also called paramesonephric ducts), which would otherwise form the uterus, fallopian tubes, and upper part of the vagina. This allows male reproductive organs to develop. The production of AMH during this specific window of fetal development is tightly regulated by other factors, including the nuclear receptor SF-1, GATA transcription factors, the sex-determining gene DAX1, and follicle-stimulating hormone (FSH). Mutations in the AMH gene or its receptor (type II AMH receptor) can result in the persistence of Müllerian duct structures in otherwise normally developed males.
In females, AMH is produced by granulosa cells in developing ovarian follicles, especially in the early (preantral and small antral) stages.
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