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Hu F, Li D, Wang Y, Yao X, Zhang W, Liang J, Lin C, Ren J, Zhu L, Wu Z, Li S, Li Y, Zhao X, Cui B, Dong X, Tian S, Zhao Y. Novel DNA variants and mutation frequencies of hMLH1 and hMSH2 genes in colorectal cancer in the Northeast China population. PLoS One 2013; 8:e60233. [PMID: 23573243 PMCID: PMC3616036 DOI: 10.1371/journal.pone.0060233] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Accepted: 02/23/2013] [Indexed: 12/31/2022] Open
Abstract
Research on hMLH1 and hMSH2 mutations tend to focus on Lynch syndrome (LS) and LS-like colorectal cancer (CRC). No studies to date have assessed the role of hMLH1 and hMSH2 genes in mass sporadic CRC (without preselection by MSI or early age of onset). We aimed to identify novel hMLH1 and hMSH2 DNA variants, to determine the mutation frequencies and sites in both sporadic and LS CRC and their relationships with clinicopathological characteristics of CRC in Northeast of China. 452 sporadic and 21 LS CRC patients were screened for germline and somatic mutations in hMLH1 and hMSH2 genes with PCR–SSCP sequencing. We identified 11 hMLH1 and seven hMSH2 DNA variants in our study cohort. Six of them were novel: four in hMLH1 gene (IVS8-16 A>T, c.644 GAT>GTT, c.1529 CAG>CGG and c.1831 ATT>TTT) and two in hMSH2 gene (−39 C>T, insertion AACAACA at c.1127 and deletion AAG at c.1129). In sporadic CRC, germline and somatic mutation frequencies of hMLH1/hMSH2 gene were 15.59% and 17.54%, respectively (p = 0.52). Germline mutations present in hMLH1 and hMSH2 genes were 5.28% and 10.78%, respectively (p<0.01). Somatic mutations in hMLH1 and hMSH2 genes were 6.73% and 11.70%, respectively (p = 0.02). In LS CRC, both germline and somatic mutation frequencies of hMLH1/hMSH2 gene were 28.57%. The most prevalent germline mutation site in hMSH2 gene was c.1168 CTT>TTT (3.90%), a polymorphism. Somatic mutation frequency of hMLH1/hMSH2 gene was significantly different in proximal, distal colon and rectal cancer (p = 0.03). Our findings elucidate the mutation spectrum and frequency of hMLH1 and hMSH2 genes in sporadic and LS CRC, and their relationships with clinicopathological characteristics of CRC.
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Affiliation(s)
- Fulan Hu
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Dandan Li
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Yibaina Wang
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Xiaoping Yao
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Wencui Zhang
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Jing Liang
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Chunqing Lin
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Jiaojiao Ren
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Lin Zhu
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Zhiwei Wu
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Shuying Li
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Ye Li
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Xiaojuan Zhao
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
| | - Binbin Cui
- Department of Colorectal Surgery, Cancer Hospital of Harbin Medical University, Harbin, People’s Republic of China
| | - Xinshu Dong
- Department of Surgery, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, People’s Republic of China
| | - Suli Tian
- Department of Surgery, The Fourth Affiliated Hospital, Harbin Medical University, Harbin, People’s Republic of China
| | - Yashuang Zhao
- Department of Epidemiology, Public Health College, Harbin Medical University, Harbin, People’s Republic of China
- * E-mail:
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