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    Oncogene. 2001 Jun 14;20(27):3590-5.

    HNPCC mutations in the human DNA mismatch repair gene hMLH1 influence assembly of hMutLalpha and hMLH1-hEXO1 complexes.

    Jäger AC, Rasmussen M, Bisgaard HC, Singh KK, Nielsen FC, Rasmussen LJ.

    Department of Clinical Biochemistry, Rigshospitalet, DK-2100 Copenhagen, Denmark.

    Hereditary nonpolyposis colorectal cancer (HNPCC) is a common inherited form of neoplasia caused by germline mutations in DNA mismatch repair (MMR) genes. MMR proteins have been reported to associate with several proteins, including the human exonuclease 1 (hEXO1). We report here novel HNPCC-hMLH1 mutant proteins (T117M, Q426X and 1813insA) in Danish HNPCC patients. We demonstrate that these mutant HNPCC-hMLH1 proteins are unable to form complexes with hEXO1 and hPMS2 in vivo. The results indicate that mutations found in HNPCC gene carriers disrupt hMLH1-hEXO1 complex formation and hMutLalpha heterodimer assembly essential for MMR activity.

    PMID: 11429708 [PubMed - indexed for MEDLINE]

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