Desmin accumulation restrictive cardiomyopathy and atrioventricular block associated with desmin gene defects

Eloisa Arbustini, Michele Pasotti, Andrea Pilotto, Carlo Pellegrini, Maurizia Grasso, Stefano Previtali, Alessandra Repetto, Ornella Bellini, Gaetano Azan, Manuela Scaffino, Carlo Campana, Giovanni Piccolo, Mario Viganò, Luigi Tavazzi

Research output: Contribution to journalArticle

Abstract

Background: Primary desminopathies are caused by desmin gene [DES (MIM*125660)] mutations. The clinical spectrum includes pure myopathies, cardiomuscular diseases and cardiomyopathies. Patients with restrictive cardiomyopathy (RCM) plus atrioventricular block (AVB) due to DES defects are frequently unrecognized unless desmin accumulation is specifically investigated in endomyocardial biopsy (EMB) by ultrastructural study. Aims: To describe a cardiological phenotype characterized by RCM plus AVB due to desmin accumulation caused by DES defects. Methods and results: Desmin accumulation was diagnosed by means of ultrastructural and immunocytochemical studies of EMB in four unrelated probands with RCM and AVB. Candidate genes [DES and αB-crystallin (CRYAB)] were screened using sequence analysis. Four DES gene mutations were identified: three new (R16C, T453I and a 10 bp deletion at the exon-intron boundary of exon 3 disrupting the donor splice site) and one known (R406W). The disease was autosomal dominant in two families, recessive in one and associated with a de novo mutation in one. The mutations cosegregated with phenotype in all patients. CRYAB gene screening was negative. Conclusions: A cardiac phenotype characterized by RCM and AVB caused by desmin accumulation is associated with DES mutations. Although the mutations affected different domains, the cardiac phenotype was identical.

Original languageEnglish
Pages (from-to)477-483
Number of pages7
JournalEuropean Journal of Heart Failure
Volume8
Issue number5
DOIs
Publication statusPublished - Aug 2006

Keywords

  • Atrioventricular block
  • Desmin
  • Restrictive cardiomyopathy

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

Fingerprint Dive into the research topics of 'Desmin accumulation restrictive cardiomyopathy and atrioventricular block associated with desmin gene defects'. Together they form a unique fingerprint.

  • Cite this