NSD2 links dimethylation of histone H3 at lysine 36 to oncogenic programming.

NSD2 links dimethylation of histone H3 at lysine 36 to oncogenic programming.
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DOI:
10.1016/j.molcel.2011.08.042
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发表时间:
2011-11-18
期刊:
影响因子:
16
通讯作者:
Gozani O
Gozani O
中科院分区:
生物学1区
文献类型:
--
作者:
Kuo AJ;Cheung P;Chen K;Zee BM;Kioi M;Lauring J;Xi Y;Park BH;Shi X;Garcia BA;Li W;Gozani O

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组蛋白赖氨酸甲基转移酶NSD2(MMSET/WHSC1)与多种疾病有关,常因t(4;14)染色体易位而在多发性骨髓瘤中过度表达。然而,NSD2的确切催化活性尚不清楚,这阻碍了人们对该酶如何影响染色质生物学和骨髓瘤发病机制的了解。在这里,我们证明了组蛋白H3在赖氨酸36位的二甲基化(H3K36me2)是NSD2的主要染色质调节活性。NSD2对H3K36me2的催化作用足以激活基因。在t(4;14)阳性的骨髓瘤细胞中,正常的全基因组和基因特异性分布的H3K36me2被消除,创造了一种染色质景观,选择了有利于骨髓增生症的转录图谱。催化活性的NSD2使t(4;14)阴性细胞形成异种移植瘤,并以H3K36me2依赖的方式促进原代细胞的致癌转化。综上所述,我们的发现确立了H3K36me2是NSD2产生的主要产物,并证明了NSD2对这个规范的染色质标记的基因组破坏启动了癌基因编程。
The histone lysine methyltransferase NSD2 (MMSET/WHSC1) is implicated in diverse diseases and commonly overexpressed in multiple myeloma due to a recurrent t(4;14) chromosomal translocation. However, the precise catalytic activity of NSD2 is obscure, preventing progress in understanding how this enzyme influences chromatin biology and myeloma pathogenesis. Here we show that dimethylation of histone H3 at lysine 36 (H3K36me2) is the principal chromatin-regulatory activity of NSD2. Catalysis of H3K36me2 by NSD2 is sufficient for gene activation. In t(4;14)-positive myeloma cells, the normal genome-wide and gene-specific distribution of H3K36me2 is obliterated, creating a chromatin landscape that selects for a transcription profile favorable for myelomagenesis. Catalytically active NSD2 confers xenograft tumor formation upon t(4;14)-negative cells, and promotes oncogenic transformation of primary cells in an H3K36me2-dependent manner. Together our findings establish H3K36me2 as the primary product generated by NSD2, and demonstrate that genomic disorganization of this canonical chromatin mark by NSD2 initiates oncogenic programming.
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