Defining early steps in mRNA transport: mutant mRNA in myotonic dystrophy type I is blocked at entry into SC-35 domains.

Defining early steps in mRNA transport: mutant mRNA in myotonic dystrophy type I is blocked at entry into SC-35 domains.
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DOI:
10.1083/jcb.200706048
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发表时间:
2007-09-10
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Lawrence JB
Lawrence JB
中科院分区:
其他
文献类型:
--
作者:
Smith KP;Byron M;Johnson C;Xing Y;Lawrence JB

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在强直性肌营养不良1型(DM 1)中,强直性肌营养不良症蛋白激酶(DMPK)3′非翻译区的三联重复扩增导致突变信使RNA(mRNA)的核滞留。尽管DMPK基因位点精确地位于富含因子的SC-35结构域的外缘,但正常mRNA始终在该结构域内积累,并且该RNA在转录抑制后被耗尽。在DM 1中,突变体转录物从基因上分离,但积累在邻近但不进入SC-35结构域的颗粒中,这表明RNA进入该结构域被阻断。尽管它们被排除在这些区室之外,但突变体转录物是剪接的。MBNL 1(muscleblind-like protein 1)是一种可变剪接因子,在突变RNA灶中高度浓缩。小干扰RNA介导的MBNL 1敲低促进SC-35结构域中新合成的突变体转录物的积累或进入。总的来说,这些数据表明,在一些mRNA的核内路径的初始步骤是从基因到SC-35域的通道,并牵连这些结构在出口前的剪接后步骤。
In myotonic dystrophy type 1 (DM1), triplet repeat expansion in the 3′ untranslated region of dystrophia myotonica protein kinase (DMPK) causes the nuclear retention of mutant messenger RNA (mRNA). Although the DMPK gene locus positions precisely at the outer edge of a factor-rich SC-35 domain, the normal mRNA consistently accumulates within the domain, and this RNA is depleted upon transcriptional inhibition. In DM1, mutant transcripts detach from the gene but accumulate in granules that abut but do not enter SC-35 domains, suggesting that RNA entry into the domain is blocked. Despite their exclusion from these compartments, mutant transcripts are spliced. MBNL1 (muscleblind-like protein 1) is an alternative splicing factor that becomes highly concentrated with mutant RNA foci. Small interfering RNA–mediated knockdown of MBNL1 promotes the accumulation or entry of newly synthesized mutant transcripts in the SC-35 domain. Collectively, these data suggest that an initial step in the intranuclear path of some mRNAs is passage from the gene into an SC-35 domain and implicate these structures in postsplicing steps before export.
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