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Nat Commun. 2019 Sep 5;10(1):3992. doi: 10.1038/s41467-019-11995-z.

Roles for DNA polymerase δ in initiating and terminating leading strand DNA replication.

Author information

1
Genome Integrity & Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, NC, 27709, USA.
2
Integrative Bioinformatics Support Group, National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, NC, 27709, USA.
3
Genome Integrity & Structural Biology Laboratory, National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, NC, 27709, USA. kunkel@niehs.nih.gov.

Abstract

Most current evidence indicates that DNA polymerases ε and δ, respectively, perform the bulk of leading and lagging strand replication of the eukaryotic nuclear genome. Given that ribonucleotide and mismatch incorporation rates by these replicases influence somatic and germline patterns of variation, it is important to understand the details and exceptions to this overall division of labor. Using an improved method to map where these replicases incorporate ribonucleotides during replication, here we present evidence that DNA polymerase δ universally participates in initiating leading strand synthesis and that nascent leading strand synthesis switches from Pol ε to Pol δ during replication termination. Ribonucleotide maps from both the budding and fission yeast reveal conservation of these processes. These observations of replisome dynamics provide important insight into the mechanisms of eukaryotic replication and genome maintenance.

PMID:
31488849
PMCID:
PMC6728351
DOI:
10.1038/s41467-019-11995-z
[Indexed for MEDLINE]
Free PMC Article

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