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 (By similarity). 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.