A promoter in the coding region of the calcium channel gene CACNA1C generates the transcription factor CCAT.

A promoter in the coding region of the calcium channel gene CACNA1C generates the transcription factor CCAT.
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DOI:
10.1371/journal.pone.0060526
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Dolmetsch RE
Dolmetsch RE
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gomez-Ospina N;Panagiotakos G;Portmann T;Pasca SP;Rabah D;Budzillo A;Kinet JP;Dolmetsch RE

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电压门控钙通道Cav1.2的C-末端编码转录因子,钙通道相关转录调节因子(CCAT),其调节神经突延伸并抑制Cav1.2表达。CCAT在神经元和肌细胞中产生的机制知之甚少。在这里,我们表明,CCAT是由CACNA 1C,编码CaV1.2的基因的外显子46中的一个隐藏的启动子的激活。CCAT的表达在神经母细胞瘤细胞、小鼠和源自诱导多能干细胞(iPSC)的人神经元中不依赖于Cav1.2的表达,这提供了CCAT不是由CaV1.2的裂解产生的强有力证据。对CACNA 1C基因转录起始位点的分析和通道蛋白的免疫印迹分析表明,CACNA 1C基因的3′端产生了多种蛋白。这项研究为CACNA 1C的调控提供了新的见解,并为外显子启动子如何促进哺乳动物基因组的复杂性提供了一个例子。
The C-terminus of the voltage-gated calcium channel Cav1.2 encodes a transcription factor, the calcium channel associated transcriptional regulator (CCAT), that regulates neurite extension and inhibits Cav1.2 expression. The mechanisms by which CCAT is generated in neurons and myocytes are poorly understood. Here we show that CCAT is produced by activation of a cryptic promoter in exon 46 of CACNA1C, the gene that encodes CaV1.2. Expression of CCAT is independent of Cav1.2 expression in neuroblastoma cells, in mice, and in human neurons derived from induced pluripotent stem cells (iPSCs), providing strong evidence that CCAT is not generated by cleavage of CaV1.2. Analysis of the transcriptional start sites in CACNA1C and immune-blotting for channel proteins indicate that multiple proteins are generated from the 3′ end of the CACNA1C gene. This study provides new insights into the regulation of CACNA1C, and provides an example of how exonic promoters contribute to the complexity of mammalian genomes.
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