Alternative Splice Variants Modulates Dominant-Negative Function of Helios in T-Cell Leukemia.

Alternative Splice Variants Modulates Dominant-Negative Function of Helios in T-Cell Leukemia.
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选择性剪接变体调节 Helios 在 T 细胞白血病中的显性负功能

DOI:
10.1371/journal.pone.0163328
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发表时间:
2016
期刊:
影响因子:
3.7
通讯作者:
Liu F
Liu F
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhao S;Liu W;Li Y;Liu P;Li S;Dou D;Wang Y;Yang R;Xiang R;Liu F

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导致人类T细胞白血病多步发生的分子缺陷尚未确定。DNA结合蛋白Helios(称为IKZF 2)是Krüppel样锌指蛋白Ikaros家族的成员,在T细胞分化和活化中起关键作用。在这项研究中,我们确定了三个新的短Helios剪接变异体,这是T细胞白血病特异性,并证明其显性负功能。然后,我们测试不同的Helios同种型的细胞定位,以及它们与Ikaros形成异二聚体的能力,以及与包含组蛋白脱乙酰酶(HDAC)的复合物的关联。此外,T细胞白血病Helios同种型的异位表达干扰T细胞增殖和凋亡。基因表达谱分析和信号通路分析表明,丰富的信号通路对基因表达、翻译、细胞周期检查点和对DNA损伤刺激的反应至关重要。这些数据表明Helios的分子功能参与T细胞白血病的白血病发生和表型,也揭示了Helios失调作为T细胞白血病的新标志物。
The molecular defects which lead to multistep incidences of human T-cell leukemia have yet to be identified. The DNA-binding protein Helios (known as IKZF2), a member of the Ikaros family of Krüppel-like zinc-finger proteins, functions pivotally in T-cell differentiation and activation. In this study, we identify three novel short Helios splice variants which are T-cell leukemic specific, and demonstrate their dominant-negative function. We then test the cellular localization of distinct Helios isoforms, as well as their capability to form heterodimer with Ikaros, and the association with complexes comprising histone deacetylase (HDAC). In addition, the ectopic expression of T-cell leukemic Helios isoforms interferes with T-cell proliferation and apoptosis. The gene expression profiling and pathway analysis indicated the enrichment of signaling pathways essential for gene expression, translation, cell cycle checkpoint, and response to DNA damage stimulus. These data indicate the molecular function of Helios to be involved in the leukemogenesis and phenotype of T-cell leukemia, and also reveal Helios deregulation as a novel marker for T-cell leukemia.
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