The function of TOPAZ1 (testis and ovary specific TOPAZ 1, Ensembl gene identifier ENSG00000173769) is as follows. Important for normal spermatogenesis and male fertility. Specifically required for progression to the post-meiotic stages of spermatocyte development. Seems to be necessary for normal expression levels of a number of testis-expressed gene transcripts, although its role in this process is unclear. .