hMLH1, hMSH2 and hMSH6 mutations in hereditary non-polyposis colorectal cancer families from southern Sweden.
We have screened 17 Southern Sweden individuals/families with suspected hereditary non-polyposis colorectal cancer (HNPCC) for mutations in the DNA-mismatch repair genes hMLH1, hMSH2 and hMSH6 using denaturing gradient gel electrophoresis, protein truncation test and direct DNA sequencing. The families were selected on the basis of a family history of HNPCC-related tumors or the occurrence of metachronous colorectal cancer/endometrial cancer at young age in an individual with a weak family history of cancer. Furthermore, we required that tumor tissue from at least one individual in the family had to display microsatellite instability. We identified germ-line mutations in 9 individuals from 8 families. Five families had mutations in hMLH1, 4 of which were splice site mutations, 2 had frameshift mutations in hMSH2 and 1 patient with metachronous endometrial and rectal cancer but with a weak family history of cancer had a nonsense mutation in hMSH6. Our results present novel germ-line DNA-repair gene mutations, one of these in hMSH6, and demonstrate the diversified mutation spectrum in Sweden, where no founder mutation has so far been identified.
Planck
M
M
Department of Oncology, University Hospital, Lund, Sweden. Maria.Planck@onk.lu.se
Koul
A
A
Fernebro
E
E
Borg
A
A
Kristoffersson
U
U
Olsson
H
H
Wenngren
E
E
Mangell
P
P
Nilbert
M
M
D048868:Adaptor Proteins, Signal Transducing; D000328:Adult; D020137:Base Pair Mismatch / Q000235:genetics*; D002352:Carrier Proteins; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000453:epidemiology / Q000235:genetics*; D004252:DNA Mutational Analysis / Q000379:methods; D004260:DNA Repair / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000235:genetics*; D005260:Female; D016368:Frameshift Mutation; D005820:Genetic Testing; D018095:Germ-Line Mutation; D006801:Humans; D008297:Male; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D009363:Neoplasm Proteins / Q000235:genetics*; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D013548:Sweden / Q000453:epidemiology
D048868:Adaptor Proteins, Signal Transducing; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C094443:G-T mismatch-binding protein; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein