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Association of RAD 51 135 G/C, 172 G/T and XRCC3 Thr241Met Gene Polymorphisms with Increased Risk of Head and Neck Cancer

  • Kayani, Mahmood Akhtar (Department of Biosciences, COMSATS Institute of Information and Technology) ;
  • Khan, Sumeera (Department of Biosciences, COMSATS Institute of Information and Technology) ;
  • Baig, Ruqia Mehmood (Department of Zoology, Pir Mehr Ali Shah University of Arid Agriculture University) ;
  • Mahjabeen, Ishrat (Department of Biosciences, COMSATS Institute of Information and Technology)
  • Published : 2015.01.06

Abstract

Homologous recombination repair (HRR) plays an important role in protection against carcinogenic factors. Genes regulating the HRR mechanisms may impair their functions and consequently result in increased cancer susceptibility. RAD 51 and XRCC3 are key regulators of the HRR pathway and genetic variability in these may contribute to the appearance and progression of various cancers including head and neck cancer (HNC). The aim of the present study was to compare the distribution of genotypes of RAD51 (135G/C, 172 G/T) and XRCC3 (Thr241Met) polymorphisms between HNC patients and controls. Each polymorphism was genotyped using the polymerase chain reaction-restriction fragment length polymerase (PCR-RFLP) technique in 200 pathologically confirmed HNC patients along with 150 blood samples from normal, disease free healthy individuals. We observed that homozygous variant CC genotype of RAD51 135G/C was associated with a 2.5 fold increased HNC risk (OR=2.5; 95%CI=0.69-9.53; p<0.02), while second polymorphism of RAD 51 172 G/T, heterozygous variant GT genotype was associated with a 1.68 fold (OR=1.68; 95%CI=1.08-2.61; p<0.02) elevation when compared with controls. In the case of the Thr241Met polymorphism of XRCC3, we observed a 16 fold (OR=16; 95% CI=3.78-69.67; p<0.0002) increased HNC risk in patients compared to controls. These results further suggested that RAD51 (135G/C, 172 G/T) and XRCC3 (Thr241Met) polymorphisms may be effective biomarkers for genetic susceptibility to HNC. Larger studies are needed to confirm our findings and identify the underlying mechanisms.

Keywords

HRR pathway;DSBs;RAD 51 polymorphism;XRCC3 polymorphism;HNC;smoking status

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