Down-regulation of CK2? correlates with decreased expression levels of DNA replication minichromosome maintenance protein complex (MCM) genes.

ABSTRACT: Protein kinase CK2 is a serine/threonine kinase composed of two catalytic subunits (CK2? and/or CK2?') and two regulatory subunits (CK2?). It is implicated in every stage of the cell cycle and in the regulation of various intracellular pathways associated with health and disease states. The catalytic subunits have similar biochemical activity, however, their functions may differ significantly in cells and in vivo. In this regard, homozygous deletion of CK2? leads to embryonic lethality in mid-gestation potentially due to severely impaired cell proliferation. To determine the CK2?-dependent molecular mechanisms that control cell proliferation, we established a myoblast-derived cell line with inducible silencing of CK2? and carried out a comprehensive RNA-Seq analysis of gene expression. We report evidence that CK2? depletion causes delayed cell cycle progression through the S-phase and defective response to replication stress. Differential gene expression analysis revealed that the down-regulated genes were enriched in pathways implicated in cell cycle regulation, DNA replication and DNA damage repair. Interestingly, the genes coding for the minichromosome maintenance proteins (MCMs), which constitute the core of the replication origin recognition complex, were among the most significantly down-regulated genes. These findings were validated in cells and whole mouse embryos. Taken together, our study provides new evidence for a critical role of protein kinase CK2 in controlling DNA replication initiation and the expression levels of replicative DNA helicases, which ensure maintenance of proliferative potential and genome integrity in eukaryotic cells.

SUBMITTER: Schaefer S 

PROVIDER: S-EPMC6787000 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature