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Multi-Gene Single Nucleotide Polymorphism Detection in Gastric Cancer Based on Ion Semiconductor Sequencing Platform
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DNA repair enzyme polymorphisms and oxidative stress in a Turkish population with gastric carcinoma

Ayse Basak Engin1, Bensu Karahalil, Atilla Engin

  • 1Department of Toxicology, Faculty of Pharmacy, Gazi University, 06330 Hipodrom, Ankara, Turkey. abengin@gmail.com

Molecular Biology Reports
|March 11, 2011
PubMed

Insights

This study investigated genetic variations in DNA repair enzymes and their link to gastric cancer risk. Researchers found no association between specific OGG1, XPC, or XPD gene polymorphisms and gastric cancer, despite elevated oxidative stress in patients.

Area of Science:

  • Genetics
  • Oncology
  • Biochemistry

Background:

  • Reactive oxygen and nitrogen species (ROS/RNS) contribute to carcinogenesis by damaging DNA.
  • 8-oxoguanine DNA glycosylase-1 (OGG1) and nucleotide excision repair (NER) enzymes like XPC and XPD repair DNA damage.
  • The role of specific genetic polymorphisms in these repair pathways in gastric cancer susceptibility remains unclear.

Purpose of the Study:

  • To evaluate the association between OGG1 Ser326Cys, XPC Lys939Gln, and XPD Lys751Gln polymorphisms and gastric cancer risk.
  • To assess the relationship between these polymorphisms and oxidative stress markers in gastric cancer patients.

Main Methods:

  • Genotyping of OGG1, XPC, and XPD polymorphisms using PCR-RFLP in 106 gastric cancer patients and 116 controls.
  • Measurement of serum nitric oxide, albumin, total antioxidant status, and Helicobacter pylori IgG levels.

Main Results:

  • Gastric cancer patients exhibited lower serum albumin and nitric oxide levels compared to controls (P < 0.05).
  • No significant association was found between the evaluated OGG1, XPC, or XPD polymorphisms and increased gastric cancer risk.
  • Helicobacter pylori IgG seropositivity did not correlate with an elevated risk of gastric cancer.

Conclusions:

  • Despite evidence of increased oxidative stress in gastric cancer patients, the studied genetic polymorphisms in DNA repair genes (OGG1, XPC, XPD) do not appear to be significant risk factors for gastric cancer in this population.
  • Further research is needed to elucidate the complex interplay between genetic predisposition, oxidative stress, and gastric carcinogenesis.

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