NDLI: KvLQT1, a voltage-gated potassium channel responsible for human cardiac arrhythmias

Content Provider	PubMed Central
Author	Yang, Wen-pin Levesque, Paul C. Little, Wayne A. Conder, Mary Lee Shalaby, Fouad Y. Blanar, Michael A.
Copyright Year	1997
Abstract	The clinical features of long QT syndrome result from episodic life-threatening cardiac arrhythmias, specifically the polymorphic ventricular tachycardia torsades de pointes. KVLQT1 has been established as the human chromosome 11-linked gene responsible for more than 50% of inherited long QT syndrome. Here we describe the cloning of a full-length KVLQT1 cDNA and its functional expression. KVLQT1 encodes a 676-amino acid polypeptide with structural characteristics similar to voltage-gated potassium channels. Expression of KvLQT1 in Xenopus oocytes and in human embryonic kidney cells elicits a rapidly activating, K+-selective outward current. The IKr-specific blockers, E-4031 and dofetilide, do not inhibit KvLQT1, whereas clofilium, a class III antiarrhythmic agent with the propensity to induce torsades de pointes, substantially inhibits the current. Elevation of cAMP levels in oocytes nearly doubles the amplitude of KvLQT1 currents. Coexpression of minK with KvLQT1 results in a conductance with pharmacological and biophysical properties more similar to IKs than other known delayed rectifier K+ currents in the heart.
Starting Page	4017
File Format	PDF
ISSN	10916490
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	8
Volume Number	94
Language	English
Publisher	The National Academy of Sciences of the USA
Publisher Date	1997-04-15
Access Restriction	Open
Rights Holder	The National Academy of Sciences of the USA
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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