Functions as a multifunctional transcription factor that may exhibit positive and negative control on a large number of genes. May antagonize YY1 and function in development and differentiation. Weakly expressed by neuronal and glial cells in the cerebral cortex. Expressed by Purkinje cells and in the granular layers of the cerebellum. Expressed in all layers of spermatocytes in testis but not detected in sperm cells. The gene encoding this protein appears to have arisen by retrotransposition of the YY1 gene in placental mammals. It is encoded by a single exon found in an intron of the gene Mbtps2. Belongs to the YY transcription factor family.