Abstract
Purpose
Given that mismatch repair (MMR) system plays an important role in recognizing and removing insertion/deletion mutations which occur during DNA replication, common variants associated with impaired MMR system may thus increase risk of colorectal cancer (CRC). Therefore, we aimed to demonstrate the associations between common variants in two MMR genes (hMLH1 and hMSH2) and CRC risk.
Methods
We genotyped 10 intronic/promoter single-nucleotide polymorphisms (SNPs) of hMLH1 and hMSH2 in 451 CRC patients and 630 controls. Associations between genotypes and CRC risk were estimated using odds ratios and 95 % confidence intervals. Gene–gene interactions, as well as gene–environment interactions on CRC risk were also investigated.
Results
We found that IVS15-214T>C and IVS11 + 107A>G of hMSH2 were significantly associated with CRC risk. In dominant model, variant carriers of the two SNPs could decrease risk of CRC by 31 % (ORadj = 0.69, 95 % CI 0.53–0.91, p < 0.01) and 33 % (ORadj = 0.67, 95 % CI 0.47–0.95, p = 0.02), respectively. In addition, IVS7-212T>A, IVS11+183A>G and IVS8+719T>C of hMSH2 were associated with the susceptibility to colon cancer rather than rectal cancer. ATTTGGGT and TCTTAGAC haplotypes were associated with 44 and 45 % decreased risk of CRC, respectively, while ATTTGAGT and TTTCAGAC haplotypes were associated with 1.37-fold and 2.49-fold increased risk of CRC, respectively. There was a significant three-way gene–gene interaction among hMSH2 IVS11+107A>G, IVS11+183A>G and IVS8+719T>C (p < 0.01). Significant gene–environment interactions were observed between hMSH2 IVS15-214T>C and IVS11+107A>G and cereals consumption (both with p < 0.01).
Conclusions
Our findings suggested that intronic SNPs, gene–gene and gene–environment interactions in hMSH2 might be associated with susceptibility to CRC.
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Acknowledgments
This work was funded by Natural Sciences Foundation of China (NSFC) and the Grant numbers were 30671801 and 30371243.
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The authors declare no competing financial interests.
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Our study has been approved by the Institutional Research Board of Harbin Medical University and has therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
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Guangxiao Li and Fulan Hu have contributed equally to this work.
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Li, G., Hu, F., Yuan, F. et al. Intronic and promoter polymorphisms of hMLH1/hMSH2 and colorectal cancer risk in Heilongjiang Province of China. J Cancer Res Clin Oncol 141, 1393–1404 (2015). https://doi.org/10.1007/s00432-014-1898-6
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DOI: https://doi.org/10.1007/s00432-014-1898-6