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Genetic and Molecular Biology Program [C. S., R. C. M., M. M. S., S. G., J. O., R. F.], Department of Microbiology and Immunology [C. S., M. M. S., S. G., R. F.], and Department of Biochemistry and Molecular Pharmacology [R. C. M., J. O.], Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania 19107
DNA mismatch repair (MMR) plays a vital role in the faithful replication of DNA, and its inactivation leads to a mutator phenotype that has been associated with the common cancer susceptibility syndrome Hereditary Non-Polyposis Colorectal Cancer (HNPCC). Here, we report on a novel human exonuclease (hExoI) that is related to the yeast exonuclease 1. The hExoI cDNA comprises 2541 bp, which code for a Mr 94,000 protein that appears to be highly expressed in testis tissue and at very low levels in other tissues. The hExoI gene has 14 exons and is located on chromosome 1q43, as determined by fluorescence in situ hybridization and radiation hybrid mapping. hExoI was found to interact strongly with the human MMR protein hMSH2, suggesting its involvement in the MMR process and/or DNA recombination.
1 This work was supported by NIH Grants CA56542 and CA67007 (to R. F.).
2 To whom requests for reprints should be addressed, at Kimmel Cancer Center BLSB933, Thomas Jefferson University, 233 South 10th Street, Philadelphia, PA 19107. Phone: (215) 503-1346; Fax: (215) 923-1098; E-mail: cschmutt@hendrix.jci.tju.edu.
Received 8/ 5/98. Accepted 9/ 9/98.
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