Cardiac effects of the c.1583 C→G LMNA mutation in two families with Emery‑Dreifuss muscular dystrophy

Zhang,Li; Shen,Hongrui; Zhao,Zhe; Bing,Qi; Hu,Jing

doi:10.3892/mmr.2015.4065

Cardiac effects of the c.1583 C→G LMNA mutation in two families with Emery‑Dreifuss muscular dystrophy

Authors:
- Li Zhang
- Hongrui Shen
- Zhe Zhao
- Qi Bing
- Jing Hu
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Affiliations: Department of Cardiovascular Disorders, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050051, P.R. China, Department of Neuromuscular Disorders, The Third Hospital of Hebei Medical University, Shijiazhuang, Hebei 050051, P.R. China
Published online on: July 8, 2015 https://doi.org/10.3892/mmr.2015.4065
Pages: 5065-5071
Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The present study aimed to examine and analyze cardiac involvement in two Emery‑Dreifuss muscular dystrophy (EDMD) pedigrees caused by the c.1583 C→G mutation of the lamin A/C gene (LMNA). The clinical and genetic characteristics of members of two families with EDMD were evaluated by performing neurological examinations, skeletal muscle biopsies, cardiac evaluations, including electrocardiography, 24 h Holter, ultrasound cardiography and 99TcM‑MIBI‑gated myocardiac perfusion imaging, and genomic DNA sequencing. Family history investigations revealed an autosomal dominant transmission pattern of the disease in Family 1 and a sporadic case in Family 2. The three affected patients exhibited typical clinical features of EDMD, including joint contractures, muscle weakness and cardiac involvement. Muscle histopathological investigation revealed dystrophic features. In addition, each affected individual exhibited either cardiac arrhythmia, which was evident as sinus tachycardia, atrial flutter or complete atrioventricular inhibition. Cardiac imaging revealed dilated cardiomyopathy in two of the individuals, one of whom was presented with heart failure. The second patient presented with no significant abnormalities in cardiac structure or function. The three affected individuals exhibited a heterozygous missense mutation in the LMNA gene (c.1583 C→G), which caused a T528R amino acid change in the LMNA protein. In conclusion, the present study identified three patients with EDMD, exhibiting the same dominant LMNA mutation and presenting with a spectrum of severe cardiac abnormalities, including cardiac conduction system defects, cardiomyopathy and heart failure. As LMNA mutations have been associated with at least six clinical disorders, including EDMD, the results of the present study provide additional mutational and functional data, which may assist in further establishing LMNA mutational variation and disease pathogenesis.

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