SHQ1 regulation of RNA splicing is required for T-lymphoblastic leukemia cell survival.

SHQ1 regulation of RNA splicing is required for T-lymphoblastic leukemia cell survival.
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T 淋巴细胞白血病细胞存活需要 SHQ1 对 RNA 剪接的调节

DOI:
10.1038/s41467-018-06523-4
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发表时间:
2018-10-15
影响因子:
16.6
通讯作者:
Liu H
Liu H
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Su H;Hu J;Huang L;Yang Y;Thenoz M;Kuchmiy A;Hu Y;Li P;Feng H;Zhou Y;Taghon T;Van Vlierberghe P;Qing G;Chen Z;Liu H

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t -急性淋巴细胞白血病(T-ALL)是一种具有复杂异质性的侵袭性血液系统恶性肿瘤。虽然表达谱揭示了不同T-ALL亚型中共同升高的基因,但对它们的功能作用和调节机制知之甚少。我们在这里发现,参与snRNA假尿嘧啶化的H/ACA snoRNP组装因子SHQ1在T-ALL中高度表达。机制上,致癌NOTCH1直接与hq1启动子结合并激活其转录。shq1缺失可诱导体外T-ALL细胞死亡,延长小鼠T-ALL模型动物存活时间。RNA- seq显示shq1缺失损害了广泛的RNA剪接,而mycis是由于剪接效率低下而最显著下调的基因之一。MYCoverexpression可显著拯救shq1失活导致的T-ALL细胞死亡。我们在此报道NOTCH1-SHQ1-MYC轴在t细胞白血病发生中的机制。这些发现不仅揭示了SHQ1在RNA剪接和肿瘤发生中的作用,而且还为tomy调控提供了额外的见解。
T-acute lymphoblastic leukemia (T-ALL) is an aggressive hematologic malignancy with complicated heterogeneity. Although expression profiling reveals common elevated genes in distinct T-ALL subtypes, little is known about their functional role(s) and regulatory mechanism(s). We here show that SHQ1, an H/ACA snoRNP assembly factor involved in snRNA pseudouridylation, is highly expressed in T-ALL. Mechanistically, oncogenic NOTCH1 directly binds to theSHQ1promoter and activates its transcription.SHQ1depletion induces T-ALL cell death in vitro and prolongs animal survival in murine T-ALL models. RNA-Seq reveals thatSHQ1depletion impairs widespread RNA splicing, andMYCis one of the most prominently downregulated genes due to inefficient splicing.MYCoverexpression significantly rescues T-ALL cell death resulted fromSHQ1inactivation. We herein report a mechanism of NOTCH1–SHQ1–MYC axis in T-cell leukemogenesis. These findings not only shed light on the role of SHQ1 in RNA splicing and tumorigenesis, but also provide additional insight intoMYCregulation.
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发表时间: 2015-01-05
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DEPTOR 是 NOTCH1 的直接靶标,可促进 T 细胞白血病的细胞增殖和存活
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