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BioMed Research International
Volume 2013 (2013), Article ID 418604, 8 pages
Research Article

Quantitative PCR as an Alternative in the Diagnosis of Long-QT Syndrome

Department of Biochemistry, Medical University of Silesia, Narcyzów 1, 41-200 Sosnowiec, Poland

Received 12 April 2013; Revised 13 June 2013; Accepted 13 June 2013

Academic Editor: Etsuro Ito

Copyright © 2013 Ewa Moric-Janiszewska et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Congenital long-QT syndrome is a genetic disorder associated with abnormalities in the function and/or structure of cardiac ion channels. Up to the present, 13 types of the disease have been described (LQTS1-13) which result from the fact that 13 genes of which mutations can have an influence on the occurrence of the disease have been identified. Characteristic symptoms of the disease include the changes in the ECG (QT interval prolonged above 450 ms), “torsade de pointes,” fainting, and even sudden cardiac death. The present study has been focused on two types of the disease, namely, LQTS1 and LQTS2. The examination of two appropriate genes expression (KCNQ1; KCNH2) at the transcription level by QRT-PCR in a group of LQTS patients and a healthy control group showed different transcriptional activities of KCNH2 gene in LQTS2 patients compared to the control individuals. KCNQ1 gene expression study did not reveal such differences between both groups. The results indicate that QRT-PCR may serve as a complimentary method to the identification of molecular alterations in genetic determinants of LQTS2 only, but it cannot be used as a sole diagnostic criterion.