CDK18

CDK18 (cyclin-dependent kinase 18, also known as PCTAIRE3) is a serine/threonine kinase within the cyclin-dependent kinase family that contributes to oligodendrocyte lineage progression and central nervous system myelination rather than acting as a classical cell-cycle driver in differentiating glial cells^[1][2]. Mechanistically, CDK18 promotes oligodendrocyte precursor cell differentiation through activation of the extracellular signal-regulated kinase (ERK) signaling pathway, leading to increased expression of myelin-associated genes and enhanced maturation of oligodendrocytes^[1]. During developmental myelination and remyelination, CDK18 expression increases in parallel with myelin formation, supporting a functional role in white matter repair models and regenerative neurobiology studies^[1]. In disease-relevant experimental systems, modulation of CDK18 affects oligodendrocyte differentiation efficiency without significantly altering precursor-cell proliferation or apoptosis, indicating a primary role in lineage maturation programs rather than proliferative control^[1]. Compared with related cyclin-dependent kinases such as CDK2 and CDK5, which have established functions in cell-cycle regulation or broader neural development, CDK18 shows a more specific association with oligodendrocyte differentiation and myelin formation processes^[1][2]. Therefore, CDK18 represents a useful molecular target for mechanistic studies of remyelination and glial-cell maturation, particularly in experimental models investigating ERK-dependent regulation of myelin repair^[1].