CDK20

CDK20 (cyclin-dependent kinase 20), also known as CCRK (cell cycle-related kinase), encodes a kinase closely related to the cyclin-dependent kinase family and has been reported to activate CDK2, thereby contributing to cell growth and cell-cycle regulation^[1][2]. Mechanistically, CDK20 functions beyond canonical cell-cycle control and participates in the regulation of primary cilium architecture and Hedgehog (Hh) signaling, where it acts at the level of or downstream of Smoothened and upstream of GLI transcription factors^[3]. Experimental studies further demonstrated that CDK20 regulates ciliary length, morphology, and intraflagellar transport, supporting efficient trafficking of signaling components required for sustained Hh pathway activity^[3][4]. In disease-related contexts, aberrant CDK20 expression has been reported in multiple malignancies, including brain, colon, liver, lung, and ovarian cancers, and elevated expression correlates with tumor progression and poor clinical outcome in several tumor types^[5]. Compared with other cyclin-dependent kinases that primarily function through direct cell-cycle checkpoint control, CDK20 displays additional cilia-associated signaling functions and exhibits isoform-dependent biological activities that extend to cell-survival regulation^[2][3]. For experimental applications, genetic depletion of CDK20 induces defects in ciliary protein trafficking and cell-cycle progression, whereas restoration of wild-type kinase activity rescues these phenotypes, supporting its utility as a mechanistic target for studies of ciliary signaling, tumor biology, and kinase-dependent regulatory networks^[2][4].

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