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Laboratory of Molecular Carcinogenesis [J. I. R., J. C. B.], Laboratory of Molecular Genetics [A. U., T. A. K.], and Laboratory of Environmental Carcinogenesis and Mutagenesis [W. E. G., K. R. T.], National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
Results from the analysis of human tumor cell lines with mutations in DNA mismatch repair genes have contributed to the understanding of the functions of these gene products in DNA mismatch repair, microsatellite instability, cell cycle checkpoint control, transcription-coupled nucleotide excision repair, and resistance to cytotoxic agents. However, complementation of human DNA mismatch repair defects by introduction of a single cloned gene or cDNA, which would serve to directly prove or disprove their involvement in these processes, has not been accomplished. Here, we introduce a wild-type copy of the hPMS2 cDNA by stable transfection into the PMS2 mutant HEC-1-A cell line. HEC-1-A cells expressing wild-type hPMS2 exhibit increased microsatellite stability, have a reduced mutation rate at the endogenous hypoxanthine phosphoribosyltransferase locus and extracts from these cells are able to perform strand-specific mismatch repair. These results demonstrate that the hPMS2 gene is integral to the maintenance of genome stability.
1 To whom requests for reprints should be addressed, at the National Institute of Environmental Health Sciences, Mail Drop C215, P. O. Box 12233, Research Triangle Park, NC 27709. Phone: (919) 541-2992; Fax: (919) 541-0146; E-Mail: Barrett@niehs.nih.gov, Risinger@niehs.nih.gov.
Received 4/ 7/98. Accepted 6/ 1/98.
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