May be involved in transcriptional regulation. Shows widespread expression throughout the nucleus, but appears to be excluded from nucleoli. Expressed at high levels in testis, may also be expressed at low levels in heart, brain, and skeletal muscle. Expression is initially maternally contributed, with increased expression at the two-cell stage followed by significant decrease at the 4-cell stage, remaining consistently low through to the morula stage (PubMed:20624068). Elevated expression in early embryonic stage (7 days post coitum (dpc)) with decreased but consistent expression thereafter in whole embryos (PubMed:10384051). Increased expression at 20 dpc in testis, with lower but consistent expression thereafter (PubMed:10384051). Belongs to the krueppel C2H2-type zinc-finger protein family. Extended N-terminus.