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Neighboring base sequence effect on DNA damage.

Young-Ae Lee1, Ha Young Cho1, Seog K Kim1

  • 1Department of Chemistry, Yeungnam University, Gyeongsan, Gyeong-Buk, Republic of Korea.

Journal of Biomolecular Structure & Dynamics
|August 22, 2019
PubMed
Summary

DNA oxidation primarily affects guanine, with damage migration influenced by abasic sites. Carbonate radicals show independence from abasic site position, unlike larger oxidants which exhibit strong site dependency and guanine selectivity.

Keywords:
Abasic sitesBPTBPT:7,8,9,10-tetrahydroxytetrahydrobenzo[a]pyrenecarbonate radicalguanine oxidationriboflavin

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Area of Science:

  • DNA damage and repair
  • Oxidative stress mechanisms
  • Free radical chemistry

Background:

  • Guanine is the most oxidizable base in DNA.
  • Oxidation generates guanine radical cations that migrate through DNA.
  • This migration is influenced by DNA sequence and oxidizing agents.

Purpose of the Study:

  • To investigate guanine oxidation in DNA sequences containing abasic sites.
  • To compare the effects of different oxidizing agents (carbonate radical anions, BPT, riboflavin) on guanine oxidation.
  • To determine the influence of abasic site position on oxidative damage patterns.

Main Methods:

  • Exposure of DNA sequences with abasic sites to various one-electron oxidants.
  • Analysis of guanine oxidation products and cleavage patterns.
  • Varying irradiation times and oxidant types to assess reaction dependencies.

Main Results:

  • Carbonate radical anions showed abasic site position independence in guanine oxidation.
  • Larger oxidants (BPT, riboflavin) displayed strong abasic site dependency and guanine selectivity.
  • Guanine oxidation primarily occurred at 5'-G in GG doublets and central G in GGG triplets in normal sequences.

Conclusions:

  • The effect of abasic sites on guanine oxidation by carbonate radicals is minimal, possibly due to electron transfer properties.
  • Abasic sites significantly alter oxidative damage patterns with larger oxidizing agents.
  • Understanding these mechanisms is crucial for DNA repair and disease research.