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poliota, a remarkably error-prone human DNA polymerase.

A Tissier1, J P McDonald, E G Frank

  • 1Section on DNA Replication, Repair, and Mutagenesis, National Institute of Child Health and Human Development, Bethesda, MD 20892-2725, USA.

Genes & Development
|July 11, 2000
PubMed
Summary

Researchers discovered a new human DNA polymerase, poliota (RAD30B), which is highly error-prone during DNA replication. This enzyme shows unusual misincorporation patterns, particularly with template T, highlighting its potential role in mutagenesis.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The RAD30 gene in Saccharomyces cerevisiae encodes DNA polymerase eta.
  • Humans have two Rad30 homologs; RAD30A (POLH) is linked to Xeroderma pigmentosum variant.
  • The existence and function of the second human Rad30 homolog were previously uncharacterized.

Purpose of the Study:

  • To characterize the second human Rad30 homolog, designated RAD30B.
  • To determine the enzymatic properties and fidelity of the novel DNA polymerase encoded by RAD30B, named poliota.
  • To investigate the error-prone nature and misincorporation spectrum of poliota in vitro.

Main Methods:

  • Gene cloning and expression of the human RAD30B homolog.
  • In vitro DNA replication assays using purified poliota.

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  • Analysis of nucleotide misincorporation frequencies at different template bases (G, C, A, T).

    • Main Results:

    • RAD30B encodes a novel distributive DNA polymerase, poliota.
    • Poliota is highly error-prone when replicating undamaged DNA, with an average error frequency of ~1 x 10(-2) at G or C templates.
    • A striking asymmetry in misincorporation was observed: template A was replicated with high accuracy (~1-2 x 10(-4) error frequency), while template T showed significant errors, including favored misincorporation of G and high frequency of T misincorporation (~6.7 x 10(-1)).

    Conclusions:

    • Poliota is one of the most error-prone eukaryotic DNA polymerases reported.
    • Poliota exhibits an unusual and specific misincorporation spectrum in vitro.
    • The findings suggest poliota may play a significant role in DNA repair or mutagenesis.