PuSH - Publikationsserver des Helmholtz Zentrums München: Electrophysiological characterization of a large set of novel variants in the <em>SCN5A</em>-gene: Identification of novel LQTS3 and BrS mutations.

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Ortiz-Bonnin, B.* ; Rinné, S.* ; Moss, R.* ; Streit, A.K.* ; Scharf, M.* ; Richter, K.* ; Stöber, A.* ; Pfeufer, A. ; Seemann, G.* ; Kääb, S.* ; Beckmann, B.M.* ; Decher, N.*

Electrophysiological characterization of a large set of novel variants in the SCN5A-gene: Identification of novel LQTS3 and BrS mutations.

Pflugers Arch. 468, 1375-1387 (2016)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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SCN5A encodes for the α-subunit of the cardiac voltage-gated sodium channel Nav1.5. Gain-of-function mutations in SCN5A are related to congenital long QT syndrome (LQTS3) characterized by delayed cardiac repolarization, leading to a prolonged QT interval in the ECG. Loss-of-function mutations in SCN5A are related to Brugada syndrome (BrS), characterized by an ST-segment elevation in the right precordial leads (V1-V3). The aim of this study was the characterization of a large set of novel SCN5A variants found in patients with different cardiac phenotypes, mainly LQTS and BrS. SCN5A variants of 13 families were functionally characterized in Xenopus laevis oocytes using the two-electrode voltage-clamp technique. We found in most of the cases, but not all, that the electrophysiology of the variants correlated with the clinically diagnosed phenotype. A susceptibility to develop LQTS can be suggested in patients carrying the variants S216L, K480N, A572D, F816Y, and G983D. However, taking the phenotype into account, the presence of the variants in genomic data bases, the mutational segregation, combined with our in vitro and in silico experiments, the variants S216L, S262G, K480N, A572D, F816Y, G983D, and T1526P remain as variants of unknown significance. However, the SCN5A variants R568H and A993T can be classified as pathogenic LQTS3 causing mutations, while R222stop and R2012H are novel BrS causing mutations.

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