Effects of replication domains on genome-wide UV-induced DNA damage and repair

PLoS Genet. 2022 Sep 26;18(9):e1010426. doi: 10.1371/journal.pgen.1010426. eCollection 2022 Sep.

Abstract

Nucleotide excision repair is the primary repair mechanism that removes UV-induced DNA lesions in placentals. Unrepaired UV-induced lesions could result in mutations during DNA replication. Although the mutagenesis of pyrimidine dimers is reasonably well understood, the direct effects of replication fork progression on nucleotide excision repair are yet to be clarified. Here, we applied Damage-seq and XR-seq techniques and generated replication maps in synchronized UV-treated HeLa cells. The results suggest that ongoing replication stimulates local repair in both early and late replication domains. Additionally, it was revealed that lesions on lagging strand templates are repaired slower in late replication domains, which is probably due to the imbalanced sequence context. Asymmetric relative repair is in line with the strand bias of melanoma mutations, suggesting a role of exogenous damage, repair, and replication in mutational strand asymmetry.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • DNA / genetics
  • DNA Damage / genetics
  • DNA Repair / genetics
  • DNA Replication / genetics
  • HeLa Cells
  • Humans
  • Pyrimidine Dimers* / genetics
  • Ultraviolet Rays* / adverse effects

Substances

  • Pyrimidine Dimers
  • DNA