DNA repair polymorphisms XRCC1 and MGMT and risk of adult gliomas

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Martha J Felini1, Andrew F Olshan, Jane C Schroeder

  • 1Department of Epidemiology, University of North Carolina, Chapel Hill, NC, USA. mfelini@hsc.unt.edu

Neuroepidemiology
|September 28, 2007
PubMed

Insights

This study found no link between XRCC1 gene variants and glioma risk. However, certain O6-methylguanine-DNA methyltransferase (MGMT) gene polymorphisms showed a weak positive association with glioma risk in adults.

Area of Science:

  • Genetics
  • Neuro-oncology
  • Molecular Epidemiology

Background:

  • DNA repair genes, including X-ray cross complementing group 1 (XRCC1) and O6-methylguanine-DNA methyltransferase (MGMT), are crucial for repairing DNA damage.
  • Ionizing radiation, alkylating agents, and oxidative stress are risk factors for gliomas.
  • Genetic variations in DNA repair genes may influence individual susceptibility to glioma.

Purpose of the Study:

  • To investigate the association between specific polymorphisms in XRCC1 and MGMT genes and the risk of glioma.
  • To explore the role of DNA repair gene variations in glioma development.

Main Methods:

  • Population-based case-control study (San Francisco Adult Glioma study).
  • Genotyping of XRCC1 Arg399Gln, MGMT Leu84Phe, and MGMT Ile143Val polymorphisms.
  • Statistical analysis of associations between genotypes and glioma risk in white cases and controls.

Main Results:

  • No significant association was found between XRCC1 genotypes and glioma risk.
  • A weak positive association was observed for the MGMT Leu84Phe polymorphism (OR=1.26, CI 0.90-1.75).
  • A weak positive association was also observed for the MGMT Ile143Val polymorphism (OR=1.20, CI 0.85-1.71).

Conclusions:

  • XRCC1 polymorphisms do not appear to be associated with glioma risk.
  • MGMT gene polymorphisms may play a minor role in glioma susceptibility.
  • Further research is warranted to elucidate the role of MGMT in glioma development.

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