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• W2016272377 abstract "Genomic instability drives tumorigenesis by allowing the accumulation of genetic alterations that provide cells with growth advantage. Microsatellite‐instability (MSI) and the underlying mutator phenotype caused by a defect in mismatch repair (MMR) functions is the hallmark of Lynch syndrome, and is also observed in a subset of all colorectal cancers (CRC). In cells with a defective MMR system, spontaneous length changes of repetitive microsatellite sequences accumulate all over the genome at highly increased rates. At coding regions instability may lead to frameshift mutations and altered protein products. Genes that mutate this way under MMR deficiency giving selective advantage to cells in tumorigenesis are called MSI target genes. It is generally anticipated that the frameshift mutation‐containing transcripts that lead to prematurely terminated proteins undergo nonsense‐mediated decay (NMD), followed by a reduction in gene expression levels. However, when a premature stop occurs in the carboxyl‐terminal end of the gene it might escape decay mechanisms, which may lead to either dominant‐negative or oncogenic effects. Aim of this study was a genome‐wide unbiased identification of new MSI CRC target genes that escape NMD. By combining bioinformatic search to expression profiling, we created a list of 330 genes that contained mononucleotide repeats from 6 to 10 base pairs and were likely to be translated despite potential mutations. A novel frameshift predictor software was developed to search all repeat‐containing transcripts in the human genome that would escape NMD after one nucleotide deletion. To enhance the odds of identifying oncogenic mutants, the analysis was restricted to genes that were overexpressed in MSI CRC versus normal colonic mucosa. All of these genes were screened initially by sequencing the given repeat in a panel of 30 MSI CRCs.Whenever the mutation frequency exceeded 20% in the tumor set, which was considered evidence for possible selection in MSI tumorigenesis, an additional set of 70 MSI CRCs was sequenced. The great majority of the successfully sequenced genes had no mutations. Altogether four genes were mutated in over 20% of the samples in the extended 100 MSI tumor panel. These candidate driver target genes are being evaluated further by various methods, including sequencing of MSI CRC cell lines and microsatellite‐stable (MSS) CRCs, statistical analyses, and functional in vitro experiments. Citation Information: Cancer Res 2009;69(23 Suppl):A57." @default.
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• W2016272377 date "2009-12-01" @default.
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• W2016272377 title "Abstract A57: Nonsense‐mediated decay escaping mutations in microsatellite-unstable colorectal cancer" @default.
• W2016272377 doi "https://doi.org/10.1158/0008-5472.fbcr09-a57" @default.
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