Human Molecular Genetics, Vol 5, 1489-1494, Copyright © 1996 by Oxford University Press
JR Eshleman and SD Markowitz
Mismatch repair defects are carcinogenic. This conclusion comes some 80
years after the original description of a type of familial colorectal
cancer in which mismatch repair defects are involved, and from decades of
dedicated basic science research into fundamental mechanisms cells use to
repair their DNA. Mismatch repair (MMR) was described first in bacteria,
later in yeast and finally in higher eukaryotes. In bacteria, one of its
roles is the rapid repair of replicative errors thereby providing the
genome with a 100-1000-fold level of protection against mutation. It also
guards the genome by preventing recombination between non-homologous
regions of DNA. The information gained from bacteria suddenly became
relevant to human neoplasia in 1993 when the RER phenotype of
microsatellite instability was discovered in human cancers and was rapidly
shown to be due to defects in mismatch repair. Evidence supporting the role
of MMR defects in carcinogenesis comes from a variety of independent
sources including: (i) theoretical considerations of the requirement for a
mutator phenotype as a step in multistage carcinogenesis; (ii) discovering
that MMR defects cause a 'mutator phenotype' destabilizing endogenous
expressed genes including those integral to carcinogenesis; (iii) finding
MMR defects in the germline of HNPCC kindred members; (iv) finding that
such defects behave as classic tumor suppressor genes in both familial and
sporadic colorectal cancers; (v) discovering that MMR 'knockout' mice have
an increased incidence of tumors; and (vi) discovering that genetic
complementation of MMR defective cells stabilizes the MMR deficiency-
associated microsatellite instability. Models of carcinogenesis now must
integrate the concepts of a MMR defect induced mutator phenotype (Loeb)
with the concepts of multistep colon carcinogenesis (Fearon and Vogelstein)
and clonal heterogeneity/selection (Nowell).
REVIEWS
Mismatch repair defects in human carcinogenesis
Department of Pathology, University Hospitals of Cleveland, OH, USA.
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