Characterization of Cdc2 kinase in the red claw crayfish (Cherax quadricarinatus): Evidence for its role in regulating oogenesis

Cdc2 kinase is a catalytic subunit of the maturation-promoting factor (MPF), a central factor for inducing the meiotic maturation of oocytes. MPF has been studied in a wide variety of animal species; however, its expression in crustaceans is poorly characterized. In this study, a complete cDNA sequence of Cdc2 kinase was cloned from the red claw crayfish, Cherax quadricarinatus, and its spatiotemporal expression profiles were analyzed. The Cdc2 cDNA (1769 bp) encodes for a 299 amino acid protein with a calculated molecular weight of 34.7 kDa. Quantitative real-time PCR demonstrated that Cdc2 mRNA was expressed mainly in the ovary tissue and the expression decreased as the ovaries developed. Immunohistochemistry analysis revealed that the Cdc2 protein relocated from the cytoplasm to the nucleus during oogenesis. These findings suggest that Cdc2 kinase may play an important role in the gametogenesis and gonad development in C. quadricarinatus.

► The full-length cDNA of Cdc2 of C. quadricarinatus was cloned. ► Sequence analysis, mRNA distribution and expression were investigated. ► Cdc2 mRNA was mainly expressed in ovaries and decreased during ovarian development. ► Cdc2 protein relocated from the cytoplasm to nucleus during ovarian development.