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Genomic stability maintenance requires correct DNA replication, chromosome segregation, and DNA repair, while defects of these processes result in tumor development or cell death. Although abnormalities in DNA replication and repair regulation are proposed as underlying causes for genomic instability, the detailed mechanism remains unclear. Here, we investigated whether NKX6.3 plays a role in the maintenance of genomic stability in gastric epithelial cells. NKX6.3 functioned as a transcription factor for  CDT1  and  RPA1 , and its depletion increased replication fork rate, and fork asymmetry. Notably, we showed that abnormal DNA replication by the depletion of NKX6.3 caused DNA damage and induced homologous recombination inhibition. Depletion of NKX6.3 also caused copy number alterations of various genes in the vast chromosomal region. Hence, our findings underscore NKX6.3 might be a crucial factor of DNA replication and repair regulation from genomic instability in gastric epithelial cells.

oncogenesis

Depletion of NK6 Homeobox 3 (NKX6.3) causes gastric carcinogenesis through copy number alterations by inducing impairment of DNA replication and repair regulation