An intronic polymorphism associated with increased XRCC1 expression, reduced apoptosis and familial breast cancer

XRCC1 coordinates the activities of DNA polymerase-β and DNA ligase for base excision repair of oxidative DNA damage. In addition, there is some evidence that XRCC1 is a negative regulator of apoptosis. Single nucleotide polymorphisms in XRCC1 have been inconsistently associated with breast cancer risk. We evaluated XRCC1 gene expression in breast cancer cell lines and carcinogen-induced apoptosis in benign breast epithelial cells in relation to XRCC1 genotypes. XRCC1 IVS10+141G>A was associated with increased expression of XRCC1 mRNA and protein, and reduced apoptosis in response to benzo-[a]-pyrene or ionizing radiation, but XRCC1 R399Q was not. These genotypes were also assessed in a clinic-based sample that included 190 breast cancer patients with a family history of breast cancer and 95 controls with no family history of breast cancer. Heterozygous XRCC1 IVS10+141G>A was associated with an increased breast cancer risk (O.R. = 1.7, 95% C.I. 1.016–2.827, P = 0.04) as was homozygous XRCC1 IVS10+141G>A (O.R. = 4.7, 95% C.I. 1.028–21.444, P = 0.03). XRCC1 R399Q was not associated with breast cancer (O.R. 1.00, 95% C.I. 0.61–1.64). The XRCC1 IVS10+141G>A locus is centered in a sequence that is nearly identical to the consensus binding site for the PLAG1 transcription factor. XRCC1 IVS10+141G>A is an intronic polymorphism that is associated with XRCC1 expression, apoptosis and familial breast cancer. It may occur within an intronic regulatory sequence.

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