一种E2泛基素结合酶将二基素化H2B与H3K27M连接在一起,从而对基斯的功能起到作用
Alan L Jiao1,2, Erdem Sendinc2, Barry M Zee2
1Ludwig Institute for Cancer Research, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7DQ, United Kingdom.
概括
研究人员在C. elegans中确定了H3K27M胆突变的遗传抑制剂,揭示了在扩散中线质瘤 (DMGs) 中恢复H3K27me3水平的机制. 这项工作为儿童大脑瘤提供了新的治疗点.
科学领域:
- 表观遗传学和癌症生物学
- 发育生物学和遗传学
背景情况:
- 在H3K27M基素突变驱动扩散的中线质瘤 (DMGs),其特点是H3K27三甲基化 (H3K27me3) 的全球损失.
- 这种H3K27M表型保留在像*Caenorhabditis elegans* (*C. elegans*) 这样的模型生物中,为遗传查提供了一个平台.
研究的目的:
- 为了确定*C. elegans*中H3K27M胆固醇突变的遗传抑制剂.
- 阐明在存在H3K27M突变的情况下恢复H3K27me3水平的基础分子机制.
主要方法:
- 在表达H3K27M胆固醇的*C. elegans*中进行了全基因组抑制选.
- 抑制器突变被映射到特定的基因中,并分析了它们对H3K27me3水平和蛋白质相互作用的影响.
- 在人类细胞中评估了已识别的抑制剂的功能性保存.
主要成果:
- 隔离了20种抑制剂,所有这些都部分恢复了H3K27me3水平.
- 19个抑制剂映射到组素H3.3基因中,导致氨基酸替代,预计会损害聚合物抑制复合物2 (PRC2) 相互作用.
- 鉴定出一种外原抑制剂,ubc-20 (一种E2泛素结合酶),它通过抑制H2B泛化来拯救H3K27me3.
结论:
- 在体内发现支持PRC2抑制的模型通过直接接触胆.
- 通过像UBC-20这样的酶调节H2B泛化,为H3K27M驱动的扩散中线质瘤提供了潜在的治疗策略.
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