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XPD/ERCC2 mutations interfere in cellular responses to oxidative stress.

Leticia K Lerner1, Natália C Moreno1, Clarissa R R Rocha1

  • 1Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil.

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Summary

The DNA repair protein XPD (xeroderma pigmentosum group D) plays a crucial role in fixing oxidative DNA damage. Mutations in XPD increase sensitivity to oxidative stress and impair DNA repair capacity.

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Area of Science:

  • DNA repair mechanisms
  • Oxidative stress and DNA damage
  • Molecular biology of DNA repair

Background:

  • Nucleotide excision repair (NER) removes bulky DNA lesions, but its role in oxidative stress repair is unclear.
  • The XPD/ERCC2 helicase is involved in NER and transcription.
  • XPD mutations cause various clinical phenotypes, including xeroderma pigmentosum, Cockayne syndrome, and trichothiodystrophy.

Purpose of the Study:

  • To investigate the role of XPD in repairing oxidative DNA damage.
  • To assess the sensitivity of XPD-mutated cell lines to oxidative stress.
  • To compare the DNA repair capacity of different XPD-mutated cell lines.

Main Methods:

  • Studied XPD-mutated cell lines from patients with xeroderma pigmentosum (XP), XP and Cockayne syndrome (XP-D/CS), and trichothiodystrophy (TTD).
  • Exposed cells to oxidative stress using photoactivated methylene blue (MB) and KBrO3.
  • Utilized host cell reactivation (HCR) assays and alkaline comet assays to evaluate DNA repair capacity and DNA strand breaks.
  • Monitored cell cycle arrest (S/G2) and γ-H2AX staining.

Main Results:

  • All XPD-mutated cell lines showed sensitivity to oxidative stress, with TTD cells being the most sensitive.
  • XP-D/CS and TTD cells exhibited severely impaired repair of oxidised lesions in plasmid DNA.
  • Alkaline comet assays revealed significantly higher DNA strand breaks in XPD-mutated cells after photoactivated MB treatment.
  • XPD-mutated cells displayed strong S/G2 arrest and persistent γ-H2AX staining.

Conclusions:

  • XPD is involved in the repair of redox-induced DNA lesions.
  • XPD mutations result in differential responses to oxidatively induced DNA damage.
  • The study highlights the importance of XPD in maintaining genomic stability under oxidative stress conditions.