Transcriptional activator. Able to bind to two different type of DNA binding sites (By similarity). Plays an important role in spermatogenesis, especially in spermatocyte meiosis (PubMed:11025217, PubMed:15489334). Spermtaocytes (at protein level). Expressed in adult brain, heart skeletal muscle, lung, kidney and gonads. Liver, small intestine, and spleen also show expression but at lower levels. In the testis, expressed from pachytene spermatocytes to round spermatids, but not in spermatogonia. In addition to the germ lineage, also expressed in Sertoli cells of the testis. In the ovary, only granulosa cells of the follicles show expression. In the brain, expressed in the piriform cortex, hippocampus, habenula and in the granula cell layer in the cerebellum. Expressed both maternally and zygotically. Zygotic expression first begins in 8-cell stage embryos, with expression increasing in blastocysts. In embryos, both cell layers of the blastocyst: the trophectoderm (TE) and the inner cell mass (ICM) show expression. Male germ-cell-specific conditional knockout results in complete male infertility and meiotic arrest in spermatocytes. Spermatocytes show aberrant chromosomal synapsis and DNA double-strand breaks (DSB) repair and significantly reduced expression of DSB repair-associated genes and meiotic arrest-related genes.