This gene is located in the pseudoautosomal region 1 (PAR1) of X and Y chromosomes. It was earlier identified as a gene with similarity to Ac transposable elements，however，was found not to have transposase activity. Later studies show that this gene product is localized in the nucleus and functions as a transcription factor. It binds to DNA elements found in the promoter regions of several genes related to cell proliferation，such as histone H1，hence may have a role in regulating genes related to cell proliferation. Alternatively spliced transcript variants with different 5’ untranslated region have been found for this gene.