PrimPol-dependent single-stranded gap formation mediates homologous recombination at bulky DNA adducts.pdf (1.85 MB)
PrimPol-dependent single-stranded gap formation mediates homologous recombination at bulky DNA adducts
journal contribution
posted on 2023-06-10, 00:43 authored by Ann Liza Piberger, Akhil Bowry, Richard D W Kelly, Alexandra K Walker, Daniel González-Acosta, Laura BaileyLaura Bailey, Aidan DohertyAidan Doherty, Juan Méndez, Joanna R Morris, Helen E Bryant, Eva PetermannStalled replication forks can be restarted and repaired by RAD51-mediated homologous recombination (HR), but HR can also perform post-replicative repair after bypass of the obstacle. Bulky DNA adducts are important replication-blocking lesions, but it is unknown whether they activate HR at stalled forks or behind ongoing forks. Using mainly BPDE-DNA adducts as model lesions, we show that HR induced by bulky adducts in mammalian cells predominantly occurs at post-replicative gaps formed by the DNA/RNA primase PrimPol. RAD51 recruitment under these conditions does not result from fork stalling, but rather occurs at gaps formed by PrimPol re-priming and resection by MRE11 and EXO1. In contrast, RAD51 loading at double-strand breaks does not require PrimPol. At bulky adducts, PrimPol promotes sister chromatid exchange and genetic recombination. Our data support that HR at bulky adducts in mammalian cells involves post-replicative gap repair and define a role for PrimPol in HR-mediated DNA damage tolerance.
History
Publication status
- Published
File Version
- Published version
Journal
Nature CommunicationsISSN
2041-1723Publisher
Nature ResearchExternal DOI
Issue
1Volume
11Page range
1-14Article number
a5863Event location
EnglandDepartment affiliated with
- Sussex Centre for Genome Damage Stability Publications
Full text available
- Yes
Peer reviewed?
- Yes