Second cistron in CACNA1A gene encodes a transcription factor mediating cerebellar development and SCA6.

Second cistron in CACNA1A gene encodes a transcription factor mediating cerebellar development and SCA6.
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DOI:
10.1016/j.cell.2013.05.059
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发表时间:
2013-07-03
期刊:
影响因子:
64.5
通讯作者:
Gomez CM
Gomez CM
中科院分区:
生物学1区
文献类型:
--
作者:
Du X;Wang J;Zhu H;Rinaldo L;Lamar KM;Palmenberg AC;Hansel C;Gomez CM

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CACNA1A基因编码电压门控钙通道亚基α1A,参与突触前和突触后钙离子信号传导、基因表达和几种遗传性神经系统疾病。我们发现,CACNA1A采用了一种新的策略,直接协调基因表达程序,使用双顺反子mRNA携带一个隐蔽的内部核糖体进入位点(IRES)。第一个顺反子编码已被充分表征的α1A亚基。第二个表达一种新识别的转录因子α1ACT,它协调参与神经和浦肯野细胞发育的基因程序的表达。α1ACT还含有多聚谷氨酰胺(polyQ)束,当其扩张时,会导致脊髓小脑共济失调6型(SCA 6)。当作为独立多肽表达时,α1ACT带有扩展的polyQ束,缺乏转录因子功能和神经突生长特性,导致培养物中的细胞死亡,并导致转基因小鼠的共济失调和小脑萎缩。抑制SCA6中的CACNA1A IRES功能可能是一种潜在的治疗策略。
The CACNA1A gene, encoding the voltage-gated calcium channel subunit α1A, is involved in pre- and postsynaptic Ca2+ signaling, gene expression, and several genetic neurological disorders. We found that CACNA1A employs a novel strategy to directly coordinate a gene expression program, using a bicistronic mRNA bearing a cryptic internal ribosomal entry site (IRES). The first cistron encodes the well-characterized α1A subunit. The second expresses a newly-recognized transcription factor, α1ACT, that coordinates expression of a program of genes involved in neural and Purkinje cell development. α1ACT also contains the polyglutamine (polyQ) tract that, when expanded, causes spinocerebellar ataxia type 6 (SCA6). When expressed as an independent polypeptide, α1ACT, bearing an expanded polyQ tract, lacks transcription factor function and neurite outgrowth properties, causes cell death in culture, and leads to ataxia and cerebellar atrophy in transgenic mice. Suppression of CACNA1A IRES function in SCA6 may be a potential therapeutic strategy.
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