Objective:
X-ray cross-complementing group 1 (
XRCC1
) and 8 Oxo guanine DNA-glycosylase 1 (OGG1) genes are implicated in the repair of single-stranded breaks (SSBRs) and base excision repair (BER) pathways. Common polymorphisms in DNA repair genes are supposed to decrease the capability of DNA repair and cause genetic instability. This study was designed to investigate the association between
XRCC1
(
rs25487
) and
OGG1
(
rs1052133
) polymorphisms and susceptibility to colorectal cancer (CRC) in the Ahvaz city, south-west Iran.
Methods:
This case- control study comprised 150 patients and 150 controls that were selected from 2 educational hospitals in Ahvaz. They were matched for age and gender, and their genotyping was carried out by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
Results:
Our results indicate that the frequency of the Gln (A) allele of
XRCC1
(
rs25487
) is significantly higher in colorectal cancer patients, compare to controls (p = 0.01, OR: 1.54, 95% CI 1.9–13.3). Significant increased risk of cancer was observed in
XRCC1
(
rs25487
) genotypes (p = 0.001 OR: 5.3, 95% CI 1.9–14.2 for Gln / Gln), while no association was found between
OGG1
(
rs1052133
) and colorectal cancer risk (p = 0.6).
Conclusion:
Our study suggests that
XRCC1
(
rs25487
) polymorphism might be associated with an increasing risk of CRC in Ahvaz. It also demonstrates positive correlation between the
XRCC1
(
rs25487
) genotypes and demographic characteristics, such as smoking and increased age in patients and control groups.
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