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Related Experiment Videos

Unique misinsertion specificity of poliota may decrease the mutagenic potential of deaminated cytosines.

A Vaisman1, R Woodgate

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

The EMBO Journal
|November 15, 2001
PubMed
Summary

DNA polymerase iota (poliota) bypasses DNA lesions, inserting nucleotides opposite uracil and oxidized bases. It preferentially inserts guanine opposite uracil derivatives, potentially reducing mutagenicity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA polymerase iota (poliota) is a distributive, error-prone enzyme.
  • It can incorporate nucleotides opposite various DNA lesions but struggles with further elongation.

Purpose of the Study:

  • To investigate poliota's ability to facilitate bypass of uracil and its derivatives, and oxidized cytosine and guanine residues.
  • To determine the fidelity of translesion replication by poliota depending on the specific DNA lesion.

Main Methods:

  • Assessing nucleotide incorporation opposite DNA lesions by poliota.
  • Evaluating primer extension efficiency after misincorporation.

Main Results:

  • Polioiota efficiently bypasses uracil, 5-hydroxyuracil, 5,6-dihydrouracil, 8-oxoguanine, and 5-hydroxycytosine.

Related Experiment Videos

  • It shows a preference for inserting T and G over A opposite uracil and its derivatives.
  • G:U, G:5-OHU, and G:5,6-DHU mispairs were extended efficiently, unlike T:U, T:5-OHU, and T:5,6-DHU mispairs.

    • Conclusions:

    • Polioiota facilitates translesion synthesis across uracil and oxidized base lesions.
    • The enzyme's preference for inserting guanine opposite uracil derivatives may serve as a cellular mechanism to mitigate the mutagenic effects of cytosine deamination products.