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Non-truncating hMLH1 variants identified in Slovenian gastric cancer patients are not associated with Lynch syndrome : a functional analysis report
Vogelsang, Matjaž ; Komel, Radovan
Hereditary non-polyposis colorectal cancer is the most common known genetic syndrome that predisposes to various types of cancer including gastric cancer and occures mainly due to pathogenic germline ...mutations in DNA mismatch repair(MMR) genes, such as MLH1, MSH2 and MSH6. Impaired MMR activity can lead to microsatellite instability (MSI) in tumor tissues. Interpreting the pathogenic significance of identified mutations in MMR genes, especially missense alterations and short in-frame deletions and insertions is challenging and functional analysis is often needed to accurately assess theirpathogenicities. The purpose of this study was to evaluate functional significance of MLH1 missense mutations, previously identified in unrelated Slovenian patients with MSI-positive gastric carinomas. A novel in vivo yeast-based approach and in silico predictions were used. Variant E433Q was characterized for the first time and was shown to have no effect on MLH1 protein function. Functional analysis of amino acid rearrangement K618A, withpreviously reported contradictory results of its pathogenicity, suggests that the variant is a neutral polymorphism. Results of our study imply that there is either germline mutation or an epigenetic inactivation of another MMRgene, which causes MSI phenotype in the referred gastric cancer cases.
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