Autosomal recessive catecholamine- or exercise-induced polymorphic ventricular tachycardia: Clinical features and assignment of the disease gene to chromosome 1p13-21

Hadas Lahat, Michael Eldar, Etgar Levy-Nissenbaum, Tangiz Bahan, Eitan Friedman, Asad Khoury, Avraham Lorber, Daniel L. Kastner, Boleslaw Goldman, Elon Pras

Research output: Contribution to journalArticlepeer-review

Abstract

Background - Catecholaminergic polymorphic ventricular tachycardia (PVT) is characterized by episodes of syncope, seizures, or sudden death in response to physiological or emotional stress. In 2 families with autosomal dominant inheritance, the disease gene was mapped to chromosome 1q42-43. The objectives of this study were to characterize the clinical features of the disease in a Bedouin tribe from Israel and to map the disease gene. Methods and Results - In this Bedouin tribe, 9 children (age, 7 ±4 years) from 7 related families have died suddenly during the past decade, and 12 other children suffered from recurrent syncope and seizures starting at the age of 6±3 years. Parents of affected individuals were asymptomatic and were all related (first-, second-, or third-degree cousins). Segregation analysis suggested autosomal recessive inheritance. All 12 symptomatic patients and 1 asymptomatic sibling (mean age, 13±7 years) were found to have a relative resting bradycardia (64±13 bpm, versus 93±12 bpm in the unaffected siblings), as well as PVT induced by treadmill or isoproterenol infusion and appearing at a mean sinus rate of 110±10 bpm. Patients responded favorably to treatment with β-blockers. A genome-wide search using polymorphic DNA markers mapped the disease locus to a 16-megabase interval on chromosome 1p13-21. A maximal lod score of 8.24 was obtained with D1S189 at θ=0.00. Sequencing of KCND3, a gene that encodes an ItO potassium channel transporter, did not reveal any significant sequence alterations. Conclusions - This unique form of autosomal recessive PVT affects young children and may be lethal if left untreated. Linkage analysis maps this disorder to chromosome 1p13-21.

Original languageEnglish
Pages (from-to)2822-2827
Number of pages6
JournalCirculation
Volume103
Issue number23
DOIs
StatePublished - 12 Jun 2001

Keywords

  • Death, sudden
  • Genetics
  • Mapping
  • Syncope
  • Tachycardia

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