Three new nonsense mutations of MLH1 and MSH2 genes in Korean families with hereditary nonpolyposis colorectal cancer.
Hereditary nonpolyposis colorectal cancer (HNPCC) (MIM #114500), also called Lynch syndrome, is an autosomal dominantly inherited cancer syndrome accounting for 1-5% of all colorectal cancer cases. In a study of three Korean families with HNPCC consistent with the revised Bethesda criteria, DNA testing revealed three novel HNPCC germline mutations in two genes: namely, MLH1, with an insertion resulting in a frameshift and a premature stop codon; MSH2, with a deletion at nucleotide 633, exon 3, which results in stop of translation at codon 213; and MSH2, with a deletion at nucleotide 1413, exon 9, resulting in a frameshift and a premature stop codon. In the first two families, there were splice mutations at c.2006-6 thymine to cytosine. The clinical implications of a frameshift mutation are discussed, along with the significance of common underlying splice mutations existing within families with HNPCC.
Yoon
Seoyoung
S
Department of Laboratory Medicine, Yonsei University College of Medicine, 250 Seongsanno, Seodaemun-gu, Seoul 120-752, Korea.
Park
Tae Sung
TS
Kim
Nam Kyu
NK
Lee
Kyung-A
KA
Kim
Juwon
J
Song
Jaewoo
J
Kim
Bo-Young
BY
Choi
Jong Rak
JR
D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics*; D044466:Asian People / Q000235:genetics; D018388:Codon, Terminator; D015179:Colorectal Neoplasms / Q000235:genetics*; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000235:genetics*; D005091:Exons; D005190:Family; D005260:Female; D016368:Frameshift Mutation; D018095:Germ-Line Mutation; D006801:Humans; D007723:Korea; D008297:Male; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein / Q000235:genetics*; D020125:Mutation, Missense; D009687:Nuclear Proteins / Q000235:genetics*; D010375:Pedigree
D048868:Adaptor Proteins, Signal Transducing; D018388:Codon, Terminator; C501486:MLH1 protein, human; D009687:Nuclear Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein