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J Am Coll Cardiol, 2002; 39:981-990
© 2002 by the American College of Cardiology Foundation
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CLINICAL STUDY: CARDIOMYOPATHY

Autosomal dominant dilated cardiomyopathy with atrioventricular block: a lamin A/C defect-related disease

Eloisa Arbustini, MD*,*, Andrea Pilotto, TD*, Alessandra Repetto, MD{dagger}, Maurizia Grasso, PhD*, Andrea Negri, TD*, Marta Diegoli, PhD*, Carlo Campana, MD{dagger}, Laura Scelsi, MD{dagger}, Elisa Baldini, MD{dagger}, Antonello Gavazzi, MD{ddagger} and Luigi Tavazzi, MD{dagger}

* Molecular Diagnostic Division, IRCCS Policlinico San Matteo, Pavia, Italy
{dagger} Cardiology Division, IRCCS Policlinico San Matteo, Pavia, Italy
{ddagger} Cardiology Division, Ospedali Riuniti, Bergamo, Italy

Manuscript received August 14, 2001; revised manuscript received December 6, 2001, accepted December 21, 2001.

* Reprint requests and correspondence: Dr. Eloisa Arbustini, Molecular Diagnostic Laboratory, Transplant Research Area, I.R.C.C.S. Policlinico San Matteo, Via Forlanini 16, 27100 Pavia, Italy.
e.arbustini{at}smatteo.pv.it

OBJECTIVES: We investigated the prevalence of lamin A/C (LMNA) gene defects in familial and sporadic dilated cardiomyopathies (DCM) associated with atrioventricular block (AVB) or increased serum creatine-phosphokinase (sCPK), and the corresponding changes in myocardial and protein expression.

BACKGROUND: It has been reported that familial DCM, associated with conduction disturbances or variable myopathies, is causally linked to LMNA gene defects.

METHODS: The LMNA gene and myocardial ultrastructural and immunochemical changes were analyzed in 73 cases of DCM (49 pure, 15 with AVB [seven familial, eight sporadic], 9 with increased sCPK), four cases of familial AVB and 19 non-DCM heart diseases. The normal controls included eight heart donor biopsies for tissue studies and 107 subjects for LMNA gene studies.

RESULTS: Five novel LMNA mutations (K97E, E111X, R190W, E317K, four base pair insertion at 1,713 cDNA) were identified in five cases of familial autosomal dominant DCM with AVB (5/15: 33%). The LMNA expression of the myocyte nuclei was reduced or absent. Western blot protein analyses of three hearts with different mutations showed an additional 30-kDa band, suggesting a degrading effect of mutated on wild-type protein. Focal disruptions, bleb formation and nuclear pore clustering were documented by electron microscopy of the myocyte nuclear membranes. None of these changes and no mutations were found in the nine patients with DCM and increased sCPK or in the disease and normal controls.

CONCLUSIONS: The LMNA gene mutations account for 33% of the DCMs with AVB, all familial autosomal dominant. Increased sCPK in patients with DCM without AVB is not a useful predictor of LMNA mutation.

Abbreviations and Acronyms
  DHPLC
  AVB
  atrioventricular block
  DCM
  dilated cardiomyopathy
  DHPLC
  denaturing high-performance liquid chromatography
  EDMD
  Emery-Dreifuss muscular dystrophy
  EMB
  endomyocardial biopsy
  LBBB
  left bundle brunch block
  LGMD
  limb girdle muscular dystrophy
  LMNA
  lamin A/C
  NYHA
  New York Heart Association
  sCPK
  serum creatine-phosphokinase




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