髓母细胞瘤染色质状态差异揭示KDM2B为选择性依赖靶点
Divergent medulloblastoma chromatin states disclose KDM2B as a selective dependency
髓母细胞瘤是儿童常见的小脑肿瘤，常带有染色质修饰基因异常，但这些异常如何驱动肿瘤一直不明。研究整合组蛋白修饰、突变、DNA甲基化和转录组数据，比较各亚组的染色质状态，发现3/4组肿瘤的神经发育基因启动子上富集“二价/预备增强子”状态。KDM2B异常结合在这些启动子上，通过募集多梳抑制复合物压制神经元分化程序。敲除或降解KDM2B能选择性抑制肿瘤模型生长。这提示KDM2B是高风险亚组的候选治疗靶点，但尚处于临床前阶段。
为什么推荐给您：重要新机制和候选靶点，但仅临床前体外与动物验证，未进入人体。
不需要生物学背景，多打比方
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摘要Abstract
Medulloblastoma is a biologically heterogeneous childhood cerebellar tumor harboring frequent chromatin-modifying gene alterations. How these alterations promote transcriptional programs governing malignancy remains poorly defined. To address this knowledge gap, we evaluated chromatin states across medulloblastoma subgroups by multi-modal integration of histone modifications with mutational, DNA methylation and transcriptomic profiles. A bivalent/poised enhancer (EnhBiv) state was specifically enriched at the promoters of neurodevelopmental genes in Group 3/4 medulloblastoma. Integrative bioinformatics coupled with chromatin occupancy studies identified aberrant KDM2B binding at EnhBiv-enriched promoters. CRISPR-mediated knockout or acute protein degradation of KDM2B selectively suppressed the growth of medulloblastoma models in vitro and in vivo. Mechanistically, KDM2B promotes sequential recruitment of Polycomb repressive complexes (PRC1/PRC2) and EnhBiv chromatin, thereby repressing neuronal differentiation programs. Collectively, we provide foundational insights into an epigenetic basis of medulloblastoma, nominating KDM2B as a selective dependency in high-risk subgroups that warrants consideration as a candidate therapeutic target.