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Double silencing of relevant genes suggests the existence of the direct link between DNA replication/repair and central carbon metabolism in human fibroblasts.
Gene 2018 April 16
Genetic evidence for a link between DNA replication and glycolysis has been demonstrated a decade ago in Bacillus subtilis, where temperature-sensitive mutations in genes coding for replication proteins could be suppressed by mutations in genes of glycolytic enzymes. Then, a strong influence of dysfunctions of particular enzymes from the central carbon metabolism (CCM) on DNA replication and repair in Escherichia coli was reported. Therefore, we asked if such a link occurs only in bacteria or it is a more general phenomenon. Here, we demonstrate that effects of silencing (provoked by siRNA) of expression of genes coding for proteins involved in DNA replication and repair (primase, DNA polymerase ι, ligase IV, and topoisomerase IIIβ) on these processes (less efficient entry into the S phase of the cell cycle and decreased level of DNA synthesis) could be suppressed by silencing of specific genes of enzymes from CMM. Silencing of other pairs of replication/repair and CMM genes resulted in enhancement of the negative effects of lower expression levels of replication/repair genes. We suggest that these results may be proposed as a genetic evidence for the link between DNA replication/repair and CMM in human cells, indicating that it is a common biological phenomenon, occurring from bacteria to humans.
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