[Long QT-syndromes: diagnosis and genetics]

Area of Science:

• Cardiology
• Genetics
• Molecular Biology

Context:

• Long-QT syndrome (LQTS) is a genetic disorder affecting heart repolarization.
• Characterized by a prolonged QT interval, it increases the risk of sudden cardiac death.
• Genetic heterogeneity and locus variability complicate diagnostic approaches.

Purpose:

• To review the clinical manifestations of LQTS.
• To summarize the genetic underpinnings of LQTS.
• To discuss the challenges in DNA-based diagnostics for LQTS.

Summary:

• LQTS involves abnormal myocardial repolarization due to inherited defects in cardiac ion channel genes.
• These genetic mutations lead to malignant ventricular arrhythmias and sudden cardiac death.
• The disease exhibits significant genetic heterogeneity, impacting diagnostic accuracy.

Impact:

• Provides a concise overview of LQTS for researchers and clinicians.
• Highlights the role of molecular genetics in understanding cardiac arrhythmias.
• Emphasizes the complexities in diagnosing LQTS, guiding future research and diagnostic tool development.