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Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
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Gene sequencing in neonates and infants with the long QT syndrome

Sung Han Shim1, Masamichi Ito, Thomas Maher

  • 1Center for Human Genetics, Boston University School of Medicine, MA 02118, USA.

Genetic Testing
|December 29, 2005
PubMed

Insights

Genetic analysis of infants with Long QT Syndrome (LQTS) revealed multiple mutations, including novel ones, in key genes. Compound heterozygotes or digenic inheritance cases showed more severe LQTS, emphasizing early diagnosis and treatment.

Area of Science:

  • Genetics
  • Pediatrics
  • Cardiology

Background:

  • Autosomal dominant Long QT Syndrome (LQTS) poses a significant risk of life-threatening ventricular arrhythmias in infants and neonates.
  • Early identification and molecular diagnosis are crucial for managing LQTS and preventing sudden cardiac events.

Purpose of the Study:

  • To investigate the clinical and molecular characteristics of LQTS in a cohort of neonates and infants.
  • To identify mutations in LQTS-associated genes and correlate them with disease severity.

Main Methods:

  • DNA extraction and mutation analysis of 18 exons across 5 key LQTS genes (KCNQ1, HERG, SCN5A, KCNE1, KCNE2) in 7 infant patients.
  • Analysis of mutation types, including single mutations, compound heterozygosity, and digenic inheritance.

Main Results:

  • Eleven mutations were identified in the 7 patients, with 4 novel mutations discovered.
  • Four patients exhibited compound heterozygosity or digenic inheritance; three had single mutations.
  • Mutations were predominantly found in the HERG and SCN5A genes, with one mutation in KCNE1.

Conclusions:

  • Genetic complexity, such as compound heterozygosity or digenic inheritance, may be associated with more severe LQTS phenotypes, including early-onset manifestations in neonates and infants.
  • Prompt molecular diagnosis and consideration of interventions like pacemaker implantation are vital for managing LQTS.

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