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 ,
Maurizia Grasso, PhD*,
Andrea Negri, TD*,
Marta Diegoli, PhD*,
Carlo Campana, MD,
Laura Scelsi, MD,
Elisa Baldini, MD,
Antonello Gavazzi, MD and
Luigi Tavazzi, MD
* Molecular Diagnostic Division, IRCCS Policlinico San Matteo, Pavia, Italy
Cardiology Division, IRCCS Policlinico San Matteo, Pavia, Italy
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.
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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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