[口头报告]Phase Separation of β-catenin Controls Active Chromatin Loop Hubs to Promote Colorectal Cancer

Phase Separation of β-catenin Controls Active Chromatin Loop Hubs to Promote Colorectal Cancer
编号:3 稿件编号:47 访问权限:仅限参会人 更新:2024-10-27 15:59:52 浏览:250次 口头报告

报告开始:2024年10月31日 14:20 (Asia/Shanghai)

报告时间:10min

所在会议:[q1] 青年论坛 » [q1] 青年论坛

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摘要
Aberrant genome organization is closely correlated to cancer. However, the mechanism by which key cancer factors regulate higher-ordered genome structures for cancer remains to be illustrated. Here, we identify active chromatin loop hubs in colorectal cancer (CRC) cells by β-catenin and H3K4me3 HiChIP. Induction of DNA methylation by dCas9-KRAB-MeCP2 at loop hub area inhibits CRC cell growth. Moreover, β-catenin can form phase-separated condensates both in vitro and in CRC cells, which is associated with β-catenin-mediated loop hubs. dCas9-APEX2 based proximity labeling tools are employed to identify the components of β-catenin condensates at the selected loop hubs. The representative component candidates are further validated by nuclear co-localization via in vitro or in vivo imaging and genome co-binding via ChIP-seq. Within the candidates, FUS seems to be the scaffold protein which facilitates the phase separation ability of β-catenin, while PARP1 and DHX9 are functioned as client proteins which maintain the active environment within loop hub area through H3K4me3. Consequently, loss of the key components, either FUS or PARP1, can suppress CRC growth. Altogether, we provide new insight how cancer factors control genome architectures for cancer growth through phase separation.
关键字
β-catenin,Phase Separation,Loop Hubs
报告人
张含艺 (Hanyi Zhang)
广州医科大学 (Guangzhou Medical University)

稿件作者
张含艺 广州医科大学
王佳 广州医科大学
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