Genetic inactivation of the polycomb repressive complex 2 in T cell acute lymphoblastic leukemia.

Genetic inactivation of the polycomb repressive complex 2 in T cell acute lymphoblastic leukemia.
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DOI:
10.1038/nm.2651
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发表时间:
2012-02-06
期刊:
影响因子:
82.9
通讯作者:
--
中科院分区:
医学1区
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T细胞急性淋巴细胞白血病(T-ALL)是一种主要由NOTCH 1信号传导的致癌激活驱动的未成熟造血系统恶性肿瘤。在这项研究中,我们报告了在25%的T-ALL中存在EZH 2和SUZ 12基因的功能缺失突变和缺失,EZH 2和SUZ 12基因编码Polycomb抑制复合物2(PRC 2)复合物的关键组分。为了进一步研究PRC 2复合物在T-ALL中的作用,我们使用了NOTCH 1诱导的疾病动物模型以及人类T-ALL样本,并结合了对NOTCH 1驱动的表观遗传变化的基因座特异性和全局分析。这些研究表明,NOTCH 1的激活通过拮抗多梳抑制复合物2(PRC 2)复合物的活性特异性诱导组蛋白3(H3 K27 me 3)的抑制性标记赖氨酸-27三甲基化的丧失。这些研究证明了PRC 2复合物在人白血病中的肿瘤抑制作用,并表明致癌NOTCH 1和PRC 2功能之间迄今未被认识到的动态相互作用,用于调节基因表达和细胞转化。
T-cell acute lymphoblastic leukemia (T-ALL) is an immature hematopoietic malignancy driven mainly by oncogenic activation of NOTCH1 signaling. In this study we report the presence of loss-of-function mutations and deletions of EZH2 and SUZ12 genes, encoding critical components of the Polycomb Repressive Complex 2 (PRC2) complex, in 25% of T-ALLs. To further study the role of the PRC2 complex in T-ALL, we used NOTCH1-induced animal models of the disease, as well as human T-ALL samples, and combined locus-specific and global analysis of NOTCH1-driven epigenetic changes. These studies demonstrated that activation of NOTCH1 specifically induces loss of the repressive mark lysine-27 tri-methylation of histone 3 (H3K27me3) by antagonizing the activity of the Polycomb Repressive Complex 2 (PRC2) complex. These studies demonstrate a tumor suppressor role for the PRC2 complex in human leukemia and suggest a hitherto unrecognized dynamic interplay between oncogenic NOTCH1 and PRC2 function for the regulation of gene expression and cell transformation.
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