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Intron retention facilitates splice variant diversity in calcium-activated big potassium channel populations

Thomas J. Bell, Kevin Y. Miyashiro, Jai-Yoon Sul, Peter T. Buckley, Miler T. Lee, Ron McCullough, Jeanine Jochems, Junhyong Kim, Charles R. Cantor, Thomas D. Parsons and James H. Eberwine
Proceedings of the National Academy of Sciences of the United States of America
Vol. 107, No. 49 (December 7, 2010), pp. 21152-21157
Stable URL: http://www.jstor.org/stable/25756847
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Intron retention facilitates splice variant diversity in calcium-activated big potassium channel populations
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Abstract

We report that stress axis—regulated exon (STREX)-containing calcium-activated big potassium (BKCa) channel splice variant expression and physiology are regulated in part by cytoplasmic splicing and intron retention. NextGen sequencing of the mRNA complement of pooled hippocampal dendrite samples found intron 17a (i17a), the intron immediately preceding STREX, in the BKCa mRNA. Further molecular analyses of i17a revealed that the majority of i17a-containing BKCa channel mRNAs associate with STREX. i17a siRNA treatment followed by STREX protein immunocytochemistry demonstrated both reduced levels and altered subcellular distribution of STREX-containing BKCa channel protein. Selective reduction of i17a-BKCa or STREX-BKCa mRNAs induced similar changes in the burst firing properties of hippocampal neurons. Collectively, these data show that STREX splice variant regulation via cytoplasmic splicing and intron retention helps generate STREX-dependent BKCa current diversity in hippocampal neurons.

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