Involved in positive regulation of megakaryocyte differentiation. Acts upstream of or within regulation of proteasomal protein catabolic process; single fertilization; and spermatid development. Located in sperm cytoplasmic droplet. Is expressed in several structures, including alimentary system; central nervous system; ganglia; nose; and respiratory system. Orthologous to human PITHD1 (PITH domain containing 1). [provided by Alliance of Genome Resources, Apr 2022]