The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice

Vullhorst D, Jockusch H, Bartsch JW (2001)
Gene 264(1): 29-35.

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Abstract
K(v)3.4 belongs to the shaw subfamily of shaker-type potassium channels. It conducts fast inactivating, high threshold currents in the central nervous system and in fast-twitch skeletal muscle fibers. The corresponding mouse gene, Kcnc4, consists of five exons spanning a region of 20 kb. Approximately 700 bp of regulatory sequence were delineated. It is GC rich and lacks typical TATA and CAAT motifs. Instead, seven Sp-1 and three E-box elements define putative regulatory sequences. The mouse K(v)3.4 mRNA has a size of 3639 bp, 1120 bp of which are 3' untranslated region. A transcript initiated from an alternative 5'-exon was identified by RACE and verified by genomic analysis. This isoform, designated K(v)3.4d, is predominantly expressed in skeletal muscle and probably results from alternative promoter usage. It encodes a channel protein with a novel N-terminal cytoplasmic domain. It lacks the conserved sequence motifs encoding the shaw-type tetramerization domain and the 'ball' peptide, which confers fast inactivation properties. Another splice variant, K(v)3.4c, is derived by exon skipping in the C-terminal region and is expressed at similar levels in brain and muscle. These data demonstrate that differential splicing and alternative transcription start sites are utilised to generate a set of K(v)3.4 variants in skeletal muscle and brain, presumably involved in the regulation of excitability. (C) 2001 Elsevier Science B.V. All rights reserved.
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Vullhorst D, Jockusch H, Bartsch JW. The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice. Gene. 2001;264(1):29-35.
Vullhorst, D., Jockusch, H., & Bartsch, J. W. (2001). The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice. Gene, 264(1), 29-35.
Vullhorst, D., Jockusch, H., and Bartsch, J. W. (2001). The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice. Gene 264, 29-35.
Vullhorst, D., Jockusch, H., & Bartsch, J.W., 2001. The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice. Gene, 264(1), p 29-35.
D. Vullhorst, H. Jockusch, and J.W. Bartsch, “The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice”, Gene, vol. 264, 2001, pp. 29-35.
Vullhorst, D., Jockusch, H., Bartsch, J.W.: The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice. Gene. 264, 29-35 (2001).
Vullhorst, D, Jockusch, Harald, and Bartsch, JW. “The genomic basis of K(V)3.4 potassium channel mRNA diversity in mice”. Gene 264.1 (2001): 29-35.
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