Predicted to enable cyclin-dependent protein serine/threonine kinase regulator activity. Predicted to be involved in mitotic cell cycle phase transition and regulation of cyclin-dependent protein serine/threonine kinase activity. Predicted to act upstream of or within several processes, including cell division; meiotic cell cycle; and spermatogenesis. Part of cyclin A1-CDK2 complex. Is expressed in several structures, including blastocyst; liver; testis; and tooth. Human ortholog(s) of this gene implicated in prostate cancer. Orthologous to human CCNA1 (cyclin A1). [provided by Alliance of Genome Resources, Apr 2022]