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Nucleotide insertion and primer extension at abasic template sites in different sequence contexts

M F Goodman1, H Cai, L B Bloom

  • 1Department of Biological Sciences, University of Southern California, Los Angeles 90089-1340.

Annals of the New York Academy of Sciences
|July 29, 1994
PubMed
Summary

DNA polymerases show varied efficiencies in inserting and extending DNA past abasic lesions. Template bases significantly influence insertion, while polymerase type and template sequence dictate extension mechanisms, including direct extension and misalignment.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Abasic lesions are common DNA damage sites that can stall DNA replication.
  • Understanding how polymerases bypass these lesions is crucial for DNA repair and genome stability.

Purpose of the Study:

  • To investigate the efficiencies of insertion and extension at a site-directed abasic lesion.
  • To determine the influence of adjacent template bases and polymerase properties on lesion bypass.

Main Methods:

  • Site-directed mutagenesis to create abasic lesions.
  • Enzymatic assays measuring DNA polymerase insertion and extension efficiencies.
  • Comparative analysis of different DNA polymerases (HIV-1 RT, Drosophila DNA polymerase alpha, AMV RT, T4 DNA polymerase).

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Main Results:

  • Insertion preference was A > G > T ≈ C, with the 3'-neighboring base having a significant impact.
  • HIV-1 reverse transcriptase (RT) favored direct extension, but X.C favored misalignment extension.
  • Drosophila DNA polymerase alpha, HIV-1 RT, and AMV RT showed efficient insertion, comparable to misinsertions.
  • AMV RT failed to extend past the lesion via direct or misalignment mechanisms.
  • Exonucleolytic proofreading by T4 DNA polymerase inhibited lesion bypass, but a highly active proofreading exonuclease did not entirely prevent it.

Conclusions:

  • Adjacent template bases critically affect DNA polymerase activity at abasic lesions.
  • Different polymerases employ distinct mechanisms (direct extension, misalignment) to bypass lesions.
  • Polymerase intrinsic properties and proofreading capabilities play key roles in lesion tolerance and repair.