A novel MSH2 mutation in a Chinese family with hereditary non-polyposis colorectal cancer.
OBJECTIVE
Hereditary non-polyposis colorectal cancer (HNPCC) is one of the most common hereditary colon cancer syndrome accounting for 1-5% of all colorectal cancer cases. Germline mutations in DNA mismatch repair (MMR) genes are associated with the clinical phenotype of HNPCC. Defects in the MSH2 gene may account for about 40% of HNPCC cases including nucleotide substitutions, deletions and insertions. Only a few mutations were reported in Chinese families. This study was performed to identify the disease-causing gene mutation(s) and conduct pre-symptomatic diagnosis in a Chinese family with HNPCC.


METHODS
Mutation analysis in MLH1 and MSH2 followed by pre-symptomatic diagnosis in MSH2 was performed on genomic DNA isolated from the family members.


RESULTS
A novel duplication mutation of four nucleotides in exon 7 of MSH2 (MSH2: c.1216_1219dupCGAC) resulting in a premature stop 10 codons downstream in MSH2 (p.L407fsX417) was found. The mutation was associated with HNPCC and an asymptomatic carrier was found in the family.


CONCLUSIONS
HNPCC in a Chinese family is associated with a novel mutation in the MSH2 gene (MSH2: c.1216_1219dupCGAC).
Zheng
Duo
D
School of Biological Science and Technology, Central South University, Changsha, PR China. zhengduo@hotmail.com
Li
Tiegang
T
Liu
Xiaoping
X
Hu
Weixin
W
Chen
Hanchun
H
Yang
Yongjia
Y
D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics; D000328:Adult; D000368:Aged; D044466:Asian People / Q000235:genetics*; D002681:China; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000175:diagnosis / Q000201:enzymology / Q000235:genetics*; D004252:DNA Mutational Analysis; D005091:Exons; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D015972:Gene Expression Regulation, Neoplastic; D020022:Genetic Predisposition to Disease; D005820:Genetic Testing; D018095:Germ-Line Mutation; D006801:Humans; D008297:Male; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein / Q000235:genetics*; D009687:Nuclear Proteins / Q000235:genetics; D010375:Pedigree
D048868:Adaptor Proteins, Signal Transducing; C501486:MLH1 protein, human; D009687:Nuclear Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein