Transcriptomic and epigenetic analyses of mouse organoids expressing BrafV600E mutation [Exome-seq]
收藏干细胞与再生医学数据中心2022-02-20 更新2024-03-06 收录
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http://data.iscr.ac.cn/Article?id=d287038a0d04c2c995c57becb58cabfb
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Abnormal promoter DNA hypermethylation arises early during tumorigenesis and yet its role in cancer initiation has remained underexplored. An important scenario for examining this is, BRAFV600E-mutant colon adenocarcinomas (COAD) which most often arise in the proximal colon and harbor extensive, abnormal gene promoter CpG-island methylation or the methylator phenotype (CIMP). How CIMP and BRAF-mutations specifically interact for COAD initiation has remained unclear. Using mouse colon-derived organoids, we show promoter hypermethylation spontaneously arises in wild type cells mimicking âaging likeâ phenotype. The silenced genes sufficiently activate the Wnt pathway, causing a stemâlike state and profound differentiation block. This phenotype renders long-term cultured organoids to be rapidly susceptible to transformation by BRAFV600E with features of typical right-sided COAD. Our studies tightly link epigenetic abnormalities, suggested to arise with aging, to intestinal cell fate changes and define an âepi-driverâ role for multiple abnormally silenced genes that predispose to BRAFV600E-driven colon tumorigenesis.
提供机构：
Johns Hopkins University
创建时间：
2022-02-20
