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Article

A heterozygous missense SCN5A mutation associated with early repolarization syndrome

  • Authors:
    • Ning Li
    • Rongrong Wang
    • Cuihong Hou
    • Yinhui Zhang
    • Siyong Teng
    • Jielin Pu
  • View Affiliations / Copyright

    Affiliations: State Key Laboratory of Cardiovascular Disease, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China, Center for Arrhythmia Diagnosis and Treatment, National Center for Cardiovascular Diseases, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, P.R. China
  • Pages: 661-667
    |
    Published online on: June 21, 2013
       https://doi.org/10.3892/ijmm.2013.1422
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Abstract

The genetic background of early repolarization syndrome (ERS) has not been fully understood. In this study, we identified a missense SCN5A mutation and a polymorphism in a patient with ERS and characterized the functional consequences of the two variants. The functional consequences of mutant channels were investigated with the patch-clamp technique, immunocytochemical studies and real-time PCR. A 19-year-old female proband with recurrent syncope had a documented electrocardiogram with ventricular fibrillation (VF) proceeded by large J waves in leads I, II, III, aVF and V2-V6. Genetic analysis revealed that the patient carried a missense mutation of c.4297 G>C and a synonymous polymorphism of T5457C on the same allele of the SCN5A gene. Patch-clamp experiments demonstrated that the c.4297 G>C mutation significantly reduced the sodium current (INa) density and altered the channel kinetics. Immunocytochemical studies demonstrated that the mutation dramatically inhibited the expression of sodium channels in the cell membrane and in the cytoplasm, although the mRNA levels remained in the normal range. Noteworthy, the reduction in INa density may be partially restored from the co-existence of the T5457C polymorphism on the same allele by the upregulation of mRNA levels. In conclusion, our study indicated that the c.4297 G>C mutation caused the ‘loss-of-function’ of sodium channels that may account for the clinical phenotype of ERS. The reduction in INa density was due to a decreased number of sodium channels caused by abnormal translation processes. The T5457C polymorphism partially rescued the INa density of the mutant channels by the upregulation of mRNA levels.
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Copy and paste a formatted citation
Spandidos Publications style
Li N, Wang R, Hou C, Zhang Y, Teng S and Pu J: A heterozygous missense SCN5A mutation associated with early repolarization syndrome. Int J Mol Med 32: 661-667, 2013.
APA
Li, N., Wang, R., Hou, C., Zhang, Y., Teng, S., & Pu, J. (2013). A heterozygous missense SCN5A mutation associated with early repolarization syndrome. International Journal of Molecular Medicine, 32, 661-667. https://doi.org/10.3892/ijmm.2013.1422
MLA
Li, N., Wang, R., Hou, C., Zhang, Y., Teng, S., Pu, J."A heterozygous missense SCN5A mutation associated with early repolarization syndrome". International Journal of Molecular Medicine 32.3 (2013): 661-667.
Chicago
Li, N., Wang, R., Hou, C., Zhang, Y., Teng, S., Pu, J."A heterozygous missense SCN5A mutation associated with early repolarization syndrome". International Journal of Molecular Medicine 32, no. 3 (2013): 661-667. https://doi.org/10.3892/ijmm.2013.1422
Copy and paste a formatted citation
x
Spandidos Publications style
Li N, Wang R, Hou C, Zhang Y, Teng S and Pu J: A heterozygous missense SCN5A mutation associated with early repolarization syndrome. Int J Mol Med 32: 661-667, 2013.
APA
Li, N., Wang, R., Hou, C., Zhang, Y., Teng, S., & Pu, J. (2013). A heterozygous missense SCN5A mutation associated with early repolarization syndrome. International Journal of Molecular Medicine, 32, 661-667. https://doi.org/10.3892/ijmm.2013.1422
MLA
Li, N., Wang, R., Hou, C., Zhang, Y., Teng, S., Pu, J."A heterozygous missense SCN5A mutation associated with early repolarization syndrome". International Journal of Molecular Medicine 32.3 (2013): 661-667.
Chicago
Li, N., Wang, R., Hou, C., Zhang, Y., Teng, S., Pu, J."A heterozygous missense SCN5A mutation associated with early repolarization syndrome". International Journal of Molecular Medicine 32, no. 3 (2013): 661-667. https://doi.org/10.3892/ijmm.2013.1422
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