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PrimPol Is Required for Replicative Tolerance of G Quadruplexes in Vertebrate Cells.

ABSTRACT: G quadruplexes (G4s) can present potent blocks to DNA replication. Accurate and timely replication of G4s in vertebrates requires multiple specialized DNA helicases and polymerases to prevent genetic and epigenetic instability. Here we report that PrimPol, a recently described primase-polymerase (PrimPol), plays a crucial role in the bypass of leading strand G4 structures. While PrimPol is unable to directly replicate G4s, it can bind and reprime downstream of these structures. Disruption of either the catalytic activity or zinc-finger of PrimPol results in extreme G4-dependent epigenetic instability at the BU-1 locus in avian DT40 cells, indicative of extensive uncoupling of the replicative helicase and polymerase. Together, these observations implicate PrimPol in promoting restart of DNA synthesis downstream of, but closely coupled to, G4 replication impediments.

SUBMITTER: Schiavone D

PROVIDER: S-EPMC4712188 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature

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PrimPol Is Required for Replicative Tolerance of G Quadruplexes in Vertebrate Cells.

Schiavone Davide D Jozwiakowski Stanislaw K SK Romanello Marina M Guilbaud Guillaume G Guilliam Thomas A TA Bailey Laura J LJ Sale Julian E JE Doherty Aidan J AJ

Molecular cell 20151125 1

G quadruplexes (G4s) can present potent blocks to DNA replication. Accurate and timely replication of G4s in vertebrates requires multiple specialized DNA helicases and polymerases to prevent genetic and epigenetic instability. Here we report that PrimPol, a recently described primase-polymerase (PrimPol), plays a crucial role in the bypass of leading strand G4 structures. While PrimPol is unable to directly replicate G4s, it can bind and reprime downstream of these structures. Disruption of eit ...[more]

PMID: 26626482

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