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. 1994 Dec 25;22(25):5658–5664. doi: 10.1093/nar/22.25.5658

The fidelity of the human leading and lagging strand DNA replication apparatus with 8-oxodeoxyguanosine triphosphate.

D T Minnick 1, Y I Pavlov 1, T A Kunkel 1
PMCID: PMC310130  PMID: 7838719

Abstract

A product of oxidative metabolism, 8-oxodeoxyguanosine triphosphate (8-O-dGTP), readily pairs with adenine during DNA replication, ultimately causing A.T-->C.G transversions. This study utilized 8-O-dGTP as a probe to examine the fidelity of the leading and lagging strand replication apparatus in extracts of HeLa cells. Simian virus (SV) 40 T antigen-dependent DNA replication reactions were performed with two M13mp2 vectors with the SV40 origin located on opposite sides of the lacZ alpha sequence used to score replication errors. The presence of 8-O-dGTP at equimolar concentration with each of the 4 normal dNTPs resulted in a > 46-fold increase in error rate for A.T-->C.G transversion over that observed in the absence of 8-O-dGTP. A similar average error rate was observed on the (+) and (-) strands in both vectors, suggesting that the fidelity of replication by leading and lagging strand replication proteins is similar for the dA.8-O-dGMP mispair. Replication fidelity in the presence of 8-O-dGTP was reduced on both strands when an inhibitor of exonucleolytic proofreading (dGMP) was added to the reaction. These data suggest that the majority of dA.8-O-dGMP mispairs are proofread by both leading and lagging strand replication proteins.

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Selected References

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