PKMYT1

PKMYT1 (protein kinase, membrane associated tyrosine/threonine 1) is a member of the WEE kinase family that functions as a key negative regulator of CDK1 activity and mitotic entry, thereby contributing to cell-cycle control and genomic stability^[1]. Mechanistically, PKMYT1 participates in the G2/M checkpoint, where WEE-family kinases maintain inhibitory control over CDK1 to prevent premature progression into mitosis under conditions requiring cell-cycle surveillance^[1][2]. Through this checkpoint-regulatory role, PKMYT1 supports proper mitotic timing and helps preserve genetic integrity in proliferating cells^[1][2]. In cancer biology, increasing evidence indicates that tumor cells can become highly dependent on WEE-family kinase activity, including PKMYT1, to tolerate replication stress and DNA damage, making this pathway a relevant target for therapeutic investigation^[1][2]. Studies in colorectal cancer have shown elevated PKMYT1 expression and demonstrated that PKMYT1 silencing impairs cellular proliferation, cell-cycle progression, migration, and invasion, supporting a role in tumor development and maintenance^[3]. Compared with the related isoform WEE1, which has received substantially greater research attention, PKMYT1 remains a comparatively underexplored member of the WEE kinase family despite sharing critical functions in regulating mitotic control^[4]. For experimental applications, PKMYT1 inhibitors have emerged as valuable tools for investigating G2/M checkpoint dependence, and inhibition of PKMYT1 can promote checkpoint override, premature mitotic entry, and mitotic cell death in cancer models, supporting its development as a potential therapeutic target^[1].