XPG Gene (xpg + gene)

Distribution by Scientific Domains

Selected Abstracts

Single nucleotide polymorphisms in the XPG gene: Determination of role in DNA repair and breast cancer risk

Rajiv Kumar
Abstract In this study we determined the effect of single nucleotide polymorphisms in the XPG gene on DNA repair and breast cancer susceptibility. Ninety individuals, with previously studied DNA repair rate at 24 hr of 2 types of UV-specific cyclobutane pyrimidines dimers (CPDs) in skin were genotyped for XPG polymorphism at codon 1104 (exon 15 G>C; Asp > His). The repair rate of TT=C dimer was similar in both wild-type GG homozygotes and GC heterozygotes, whereas, for TT=T, dimer repair was non-significantly (Student's t -test, p = 0.34) lower in GC heterozygotes than wild-type GG homozygotes. Genotyping of 220 breast cancer cases and 308 controls for the same single nucleotide polymorphism in exon 15 of the XPG gene exhibited marginally significant increased frequency of the variant allele (,2 3.84, p = 0.05; OR 1.33, 95% CI 1.0,1.8) in cases (C-allele 0.29) compared to controls (C-allele 0.24). Combined heterozygote and variant homozygote genotype frequency was also higher in cases than controls (,2 4.79, p = 0.03; OR 1.50, 95%CI 1.04,2.16). 2002 Wiley-Liss, Inc. [source]

A single-nucleotide polymorphism in the XPG gene, and tumour stage, grade, and clinical course in patients with nonmuscle-invasive neoplasms of the urinary bladder

OBJECTIVE To evaluate whether the single nucleotide polymorphism (SNP), Asp1104His (G3507C), in the XPG gene affects malignant phenotypes of nonmuscle-invasive urinary bladder neoplasms (NIBN), by investigating associations between the SNP and clinicopathological variables in patients with NIBN. PATIENTS AND METHODS The 233 patients constituted newly diagnosed cases of primary NIBN in the Stockholm area. The Asp1104His polymorphism in the XPG gene was genotyped using a polymerase chain reaction-restriction fragment length polymorphism technique. RESULTS The GC + CC genotypes were more frequent in stage pT1 tumours at initial diagnosis than pTa (odds ratio 1.9, 95% confidence interval 1.0,3.5, P = 0.048). The difference was larger in the young group (4.6, 1.9,11.8, P = 0.001). In the young group, the GC + CC genotypes were significantly more frequent in high-grade than in low-grade tumours (3.1, 1.5,6.8, P = 0.004) whereas in the older group the genotypes were less frequent in high-grade tumours (0.3, 0.1,0.7, P = 0.007). The XPG genotypes were not associated with tumour recurrence, stage progression or survival. CONCLUSION These results suggest that the SNP in the XPG gene might be related to tumour invasiveness in NIBN. [source]