The landscape of microsatellite instability in colorectal and endometrial cancer genomes.

The landscape of microsatellite instability in colorectal and endometrial cancer genomes.
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DOI:
10.1016/j.cell.2013.10.015
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发表时间:
2013-11-07
期刊:
影响因子:
64.5
通讯作者:
Park PJ
Park PJ
中科院分区:
生物学1区
文献类型:
--
作者:
Kim TM;Laird PW;Park PJ

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Microsatellites - simple tandem repeats present at millions of sites in the human genome - can shorten or lengthen due to a defect in DNA mismatch repair. We present here the first comprehensive genome-wide analysis of the prevalence, mutational spectrum and functional consequences of microsatellite instability (MSI) in cancer genomes. We analyzed MSI in 277 colorectal and endometrial cancer genomes (including 57 microsatellite-unstable ones) using exome and whole-genome sequencing data. Recurrent MSI events in coding sequences showed tumor type-specificity, elevated frameshift-to-inframe ratios, and lower transcript levels than wildtype alleles. Moreover, genome-wide analysis revealed differences in the distribution of MSI versus point mutations, including overrepresentation of MSI in euchromatic and intronic regions compared to heterochromatic and intergenic regions, respectively, and depletion of MSI at nucleosome-occupied sequences. Our results provide a panoramic view of MSI in cancer genomes, highlighting their tumor type-specificity, impact on gene expression, and the role of chromatin organization.
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