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Biochem Biophys Res Commun. 2019 Jun 30;514(3):574-579. doi: 10.1016/j.bbrc.2019.04.169. Epub 2019 May 3.

A novel Kir7.1 splice variant expressed in various mouse tissues shares organisational and functional properties with human Leber amaurosis-causing mutations of this K+ channel.

Author information

1
Centro de Estudios Científicos (CECs), Avenida Arturo Prat 514, Valdivia, Chile.
2
Centro de Estudios Científicos (CECs), Avenida Arturo Prat 514, Valdivia, Chile. Electronic address: pcid@cecs.cl.

Abstract

Kir7.1 is an inwardly rectifying K+ channel present in epithelia where it shares membrane localization with the Na+/K+-pump. In the present communication we report the presence of a novel splice variant of Kir7.1 in mouse tissues including kidney, lung, choroid plexus and retinal pigment epithelium (RPE). The variant named mKir7.1-SV2 lacks most of the C-terminus domain but is predicted to have the two transmembrane domains and permeation pathway unaffected. Similarly truncated predicted proteins, Kir7.1-R166X and Kir7.1-Q219X, would arise from mutations associated with Leber Congenital Amaurosis, a rare recessive hereditary retinal disease that results in vision loss at early age. We found that mKir7.1-SV2 and the pathological variants do not produce any channel activity when expressed alone in HEK-293 cells due to their scarce presence in the plasma membrane. Simultaneous expression with the full length Kir7.1 however leads to a reduction in activity of the wild-type channel that might be due to partial proteasome degradation of WT-mutant channel heteromers.

KEYWORDS:

Kir7.1 channels; Leber congenital amaurosis; Nonsense mutations; Splice variant

PMID:
31056263
DOI:
10.1016/j.bbrc.2019.04.169

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