Oocyte-specific protein tyrosine kinase that phosphorylates and inhibits CDK1 and acts as a key regulator of meiosis during both prophase I and metaphase II. Required to maintain meiotic arrest in oocytes during the germinal vesicle (GV) stage, a long period of quiescence at dictyate prophase I, by phosphorylating CDK1 at 'Tyr-15', leading to inhibit CDK1 activity and prevent meiotic reentry. Also required for metaphase II exit during egg activation by phosphorylating CDK1 at 'Tyr-15', to ensure exit from meiosis in oocytes and promote pronuclear formation.
Dai, Zheng, Dai, Guo, Lu, Gong, Li, Zhou, Lu, Lin: "New biallelic mutations in WEE2: expanding the spectrum of mutations that cause fertilization failure or poor fertilization." in: Fertility and sterility, Vol. 111, Issue 3, pp. 510-518, (2019) (PubMed).