Human Molecular Genetics, Vol 5, 1245-1252, Copyright © 1996 by Oxford University Press
G Moslein, DJ Tester, NM Lindor, R Honchel, JM Cunningham, AJ French, KC Halling, M Schwab, P Goretzki and SN Thibodeau
To date, at least four genes involved in DNA mismatch repair, hMSH2, hMLH1,
hPMS1 and hPMS2, have been demonstrated to be altered in the germline of
patients with hereditary nonpolyposis colorectal cancer (HNPCC).
Additionally, defective mismatch repair is thought to account for the
observation of microsatellite instability (MIN) in tumors from these
patients. The genetic defect responsible for the MIN+ phenotype in sporadic
colorectal cancer, however, has yet to be clearly delineated. In order to
better understand the role of somatic and germline alterations within hMSH2
and hMLH1 in the process of colorectal tumorigenesis, we examined the
entire coding regions of both of these genes in seven patients with MIN+
sporadic colorectal cancer, 19 patients with familial colorectal cancer,
and 20 patients meeting the strict Amsterdam criteria for HNPCC. Thirteen
germline, two somatic, and four neutral alterations were identified. The
two somatic mutations occurred in patients having familial cancer, while
the germline mutations were distributed among one sporadic (14%), three
familial (16%), and nine HNPCC (45%) cases. All patients with identified
mutations in the mismatch repair genes, whose tumors were available for
analysis, demonstrated MIN. On the other hand, we could not identify
mutations in the subset of clinically defined HNPCC patients with MIN
negative tumors nor in the majority (6/7) of MIN+ sporadic tumors.
ARTICLES
Microsatellite instability and mutation analysis of hMSH2 and hMLH1 in patients with sporadic, familial and hereditary colorectal cancer
Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA.
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