Open Access

Association of the hERG mutation with long‑QT syndrome type 2, syncope and epilepsy

  • Authors:
    • Guoliang Li
    • Rui Shi
    • Jine Wu
    • Wenqi Han
    • Aifeng Zhang
    • Gong Cheng
    • Xiaolin Xue
    • Chaofeng Sun
  • View Affiliations

  • Published online on: February 4, 2016     https://doi.org/10.3892/mmr.2016.4859
  • Pages: 2467-2475
  • Copyright: © Li et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Mutations in the human ether‑à‑go‑go‑related gene (hERG) are responsible for long‑QT syndrome (LQTS) type 2 (LQT2). In the present study, a heterozygous missense mutation (A561V) linked to LQT2, syncope and epilepsy was identified in the S5/pore region of the hERG protein. The mutation, A561V, was prepared and subcloned into hERG‑pcDNA3.0. Mutant plasmids were co‑transfected into HEK‑293 cells, which stably express wild‑type (WT) hERG, in order to mimic a heterozygous genotype, and the whole‑cell current was recorded using a patch‑clamp technique. Confocal microscopy was performed to evaluate the membrane distribution of the hERG channel protein using a green fluorescent protein tagged to the N‑terminus of hERG. A561V‑hERG decreased the amplitude of the WT‑hERG currents in a concentration‑dependent manner. In addition, A561V‑hERG resulted in alterations to activation, inactivation and recovery from inactivation in the hERG protein channels. Further evaluation of hERG membrane localization indicated that the A561V‑hERG mutant protein was unable to travel to the plasma membrane, which resulted in a trafficking‑deficient WT‑hERG protein. In conclusion, A561V‑hERG exerts a potent dominant‑negative effect on WT‑hERG channels, resulting in decreased hERG currents and impairment of hERG membrane localization. This may partially elucidate the clinical manifestations of LQTS patients who carry the A561V mutation.

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March-2016
Volume 13 Issue 3

Print ISSN: 1791-2997
Online ISSN:1791-3004

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Spandidos Publications style
Li G, Shi R, Wu J, Han W, Zhang A, Cheng G, Xue X and Sun C: Association of the hERG mutation with long‑QT syndrome type 2, syncope and epilepsy. Mol Med Rep 13: 2467-2475, 2016
APA
Li, G., Shi, R., Wu, J., Han, W., Zhang, A., Cheng, G. ... Sun, C. (2016). Association of the hERG mutation with long‑QT syndrome type 2, syncope and epilepsy. Molecular Medicine Reports, 13, 2467-2475. https://doi.org/10.3892/mmr.2016.4859
MLA
Li, G., Shi, R., Wu, J., Han, W., Zhang, A., Cheng, G., Xue, X., Sun, C."Association of the hERG mutation with long‑QT syndrome type 2, syncope and epilepsy". Molecular Medicine Reports 13.3 (2016): 2467-2475.
Chicago
Li, G., Shi, R., Wu, J., Han, W., Zhang, A., Cheng, G., Xue, X., Sun, C."Association of the hERG mutation with long‑QT syndrome type 2, syncope and epilepsy". Molecular Medicine Reports 13, no. 3 (2016): 2467-2475. https://doi.org/10.3892/mmr.2016.4859