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Arrhythmogenic cardiomyopathy: a disease of intercalated discs

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Abstract

Arrhythmogenic cardiomyopathy (ACM) is an acquired progressive disease having an age-related penetrance and showing clinical manifestations usually during adolescence and young adulthood. It is characterized clinically by a high incidence of severe ventricular tachyarrhythmias and sudden cardiac death and pathologically by degeneration of ventricular cardiomyocytes with replacement by fibro-fatty tissue. Whereas, in the past, the disease was considered to involve only the right ventricle, more recent clinical studies have established that the left ventricle is frequently involved. ACM is an inherited disease in up to 50 % of cases, with predominantly an autosomal dominant pattern of transmission, although recessive inheritance has also been described. Since most of the pathogenic mutations have been identified in genes encoding desmosomal proteins, ACM is currently defined as a disease of desmosomes. However, on the basis of the most recent description of the intercalated disc organization and of the identification of a novel ACM gene encoding for an area composita protein, ACM can be considered as a disease of the intercalated disc, rather than only as a desmosomal disease. Despite increasing knowledge of the genetic basis of ACM, we are just beginning to understand early molecular events leading to cardiomyocyte degeneration, fibrosis and fibro-fatty substitution. This review summarizes recent advances in our comprehension of the link between the molecular genetics and pathogenesis of ACM and of the novel role of cardiac intercalated discs.

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  1. Department of Biology, University of Padua, Via G. Colombo 3, 35131, Padua, Italy

    Martina Calore, Alessandra Lorenzon, Marzia De Bortoli, Giulia Poloni & Alessandra Rampazzo

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  1. Martina Calore
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  2. Alessandra Lorenzon
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  3. Marzia De Bortoli
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  4. Giulia Poloni
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Correspondence to Alessandra Rampazzo.

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Research in the authors’ laboratory is supported by the Strategic Program of the University of Padua, the Ricerca Sanitaria Finalizzata (Veneto Region), the University of Padua research project (PRAT) CPDA133979 and the Cariparo Foundation (Padova and Rovigo, Italy).

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Calore, M., Lorenzon, A., De Bortoli, M. et al. Arrhythmogenic cardiomyopathy: a disease of intercalated discs. Cell Tissue Res 360, 491–500 (2015). https://doi.org/10.1007/s00441-014-2015-5

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