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Pathogenic germline MCM9 variants are rare in Australian Lynch-like syndrome patients.

Cancer Genet. 2016 Nov;209(11):497-500. Epub 2016 Oct 11
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摘要


Lynch syndrome is a hereditary cancer syndrome caused by the autosomal dominant inheritance of loss-of-function mutations in DNA mismatch repair (MMR) genes. Approximately one quarter of clinically suspected cases have no identifiable germline mutation in any MMR gene, a condition known as Lynch-like syndrome (LLS). MCM9 was recently identified as the DNA helicase in the mammalian MMR complex and loss of helicase activity results in microsatellite instability. We hypothesized that pathogenic variants in MCM9 may account for LLS. The 5'UTR and coding region of MCM9 were sequenced in germline DNA of 109 Australian patients with LLS and variants were cross-referenced with three population-based databases (dbSNP144, 1000 Genomes, ExAC). The functional effect of variants was assessed in silico with PolyPhen-2, SIFT and CONDEL. Fifteen variants that included six common SNPs and nine variants of unknown significance (VUS) were identified. We conclude that VUS occur in MCM9 in a small proportion of LLS patients and MCM9 mutations are unlikely to explain most LLS cases.

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