TLS-ERG Leukemia Fusion Protein Inhibits RNA Splicing Mediated by Serine-Arginine Proteins

TLS-ERG Leukemia Fusion Protein Inhibits RNA Splicing Mediated by Serine-Arginine Proteins
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TLS-ERG 白血病融合蛋白抑制丝氨酸-精氨酸蛋白介导的 RNA 剪接

DOI:
10.1128/mcb.20.10.3345-3354.2000
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发表时间:
2000
影响因子:
5.3
通讯作者:
D. Hickstein
D. Hickstein
中科院分区:
生物学2区
文献类型:
--
作者:
Liu Yang;L. Embree;D. Hickstein

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摘要在人类髓系白血病中,易位脂肪肉瘤(TLS)基因与ETS相关基因(ERG)融合,导致TLS-ERG蛋白的产生。我们证明,TLS和TLS-ERG白血病融合蛋白结合RNA聚合酶II通过TLS N-末端结构域,这是保留在融合蛋白;然而,TLS招募成员的丝氨酸-精氨酸(SR)家族的剪接因子通过其C-末端结构域,而TLS-ERG融合蛋白缺乏招募SR蛋白的能力,由于C-末端结构域的融合伙伴ERG的替代。在瞬时转染试验中,TLS-ERG融合蛋白抑制由这些TLS-associated SR蛋白(TASR)介导的E1 A前mRNA剪接,并且TLS-ERG融合蛋白在K562细胞中的稳定表达改变了CD 44 mRNA的剪接谱。这些结果表明TLS融合蛋白可能通过干扰重要细胞调节因子的剪接而导致细胞异常。
ABSTRACT The translocation liposarcoma (TLS) gene is fused to the ETS-related gene (ERG) in human myeloid leukemia, resulting in the generation of a TLS-ERG protein. We demonstrate that both TLS and the TLS-ERG leukemia fusion protein bind to RNA polymerase II through the TLS N-terminal domain, which is retained in the fusion protein; however, TLS recruits members of the serine-arginine (SR) family of splicing factors through its C-terminal domain, whereas the TLS-ERG fusion protein lacks the ability to recruit SR proteins due to replacement of the C-terminal domain by the fusion partner ERG. In transient-transfection assays, the TLS-ERG fusion protein inhibits E1A pre-mRNA splicing mediated by these TLS-associated SR proteins (TASR), and stable expression of the TLS-ERG fusion protein in K562 cells alters the splicing profile of CD44 mRNA. These results suggest that TLS fusion proteins may lead to cellular abnormalities by interfering with the splicing of important cellular regulators.
DOI: 10.1073/pnas.95.14.8239
发表时间: 1998-07-07
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