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DAX1
DAX1 (dosage-sensitive sex reversal, adrenal hypoplasia critical region, on chromosome X, gene 1) is a nuclear receptor protein that in humans is encoded by the ''NR0B1'' gene (nuclear receptor subfamily 0, group B, member 1).〔 The ''NR0B1'' gene is located on the short (p) arm of the X chromosome between positions 21.3 and 21.2, from base pair 30,082,120 to base pair 30,087,136.
== Function ==
This gene encodes a protein that lacks the normal DNA-binding domain contained in other nuclear receptors. The encoded protein acts as a dominant-negative regulator of transcription of other nuclear receptors including steroidogenic factor 1. This protein also functions as an anti-testis gene by acting antagonistically to SRY. Mutations in this gene result in both X-linked congenital adrenal hypoplasia and hypogonadotropic hypogonadism.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=190 )〕
DAX1 plays an important role in the normal development of several hormone-producing tissues. These tissues include the adrenal glands above each kidney, the pituitary gland and hypothalamus, which are located in the brain, and the male and female reproductive structures (the testes and ovaries). DAX1 controls the activity of certain genes in the cells that form these tissues during embryonic development. Proteins that control the activity of other genes are known as transcription factors. DAX1 also plays a role in regulating hormone production in these tissues after they have been formed.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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