Experimental Mapping of the Canine KCNJ2 and KCNJ12 Gene Structures and Functional Analysis of the Canine K(IR)2.2 ion Channel.

Abstract:

:For many model organisms traditionally in use for cardiac electrophysiological studies, characterization of ion channel genes is lacking. We focused here on two genes encoding the inward rectifier current, KCNJ2 and KCNJ12, in the dog heart. A combination of RT-PCR, 5'-RACE, and 3'-RACE demonstrated the status of KCNJ2 as a two exon gene. The complete open reading frame (ORF) was located on the second exon. One transcription initiation site was mapped. Four differential transcription termination sites were found downstream of two consensus polyadenylation signals. The canine KCNJ12 gene was found to consist of three exons, with its ORF located on the third exon. One transcription initiation and one termination site were found. No alternative splicing was observed in right ventricle or brain cortex. The gene structure of canine KCNJ2 and KCNJ12 was conserved amongst other vertebrates, while current GenBank gene annotation was determined as incomplete. In silico translation of KCN12 revealed a non-conserved glycine rich stretch located near the carboxy-terminus of the K(IR)2.2 protein. However, no differences were observed when comparing dog with human K(IR)2.2 protein upon ectopic expression in COS-7 or HEK293 cells with respect to subcellular localization or electrophysiological properties.

journal_name

Front Physiol

journal_title

Frontiers in physiology

authors

Houtman MJ,Takanari H,Kok BG,van Eck M,Montagne DR,Vos MA,de Boer TP,van der Heyden MA

doi

10.3389/fphys.2012.00009

subject

Has Abstract

pub_date

2012-01-30 00:00:00

pages

9

issn

1664-042X

journal_volume

3

pub_type

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