SRY

The „Sex determining region of Y-Gen” (SRY), known as SRY gene, is coding for a transkription factor (TDF for Testis-determining factor) . It belongs to the protein family of DNA binding-proteins. The SRY gene is beside other genes used for the determination of the sex in human as well as other mammals. Most mammals have for this purpose a further gene, UBE1. In humans SRY is normally located on the short arm of the Y chromosome. Accordingly, people who possess this chromosome with the corresponding gene, normally have a male phenotype. It does not matter how many copies of the X chromosome are present, even people with a multiple X chromosome (Klinefelter's syndrome) have this. The protein encoded by the gene Testis-determining factor controls the development of male sex.