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Long QT syndrome: ionic basis and arrhythmia mechanism in long QT syndrome type 1.

Long QT syndrome type 1 (LQT1) causes torsades de pointes arrhythmia, ventricular fibrillation, and sudden death. It usually is inherited as an autosomal dominant trait (Romano-Ward syndrome). The primary defect in LQT1 is a mutation in KVLQT1, a gene that encodes the pore-forming alpha-subunit of a K+ channel. KvLQT1 alpha-subunits coassemble with minK beta-subunits to form channels that conduct the slow delayed rectifier K+ current (I(Ks)) in the heart. Recessive mutations in KVLQT1 cause Jervell and Lange-Nielsen syndrome, which is characterized by more severe arrhythmias and congenital neural deafness. Heterologous expression studies demonstrated that mutations in KVLQT1 reduce I(Ks) by causing loss of channel function, altered channel gating, and/or a dominant-negative effect. It remains to be proven that an understanding of the molecular basis of LQT1 will lead to more effective therapy.[1]

References

  1. Long QT syndrome: ionic basis and arrhythmia mechanism in long QT syndrome type 1. Sanguinetti, M.C. J. Cardiovasc. Electrophysiol. (2000) [Pubmed]
 
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