Clinical and genetic issues in familial dilated cardiomyopathy
Key result
Familial DCM accounts for up to ~50% of idiopathic cases, making genetic screening of relatives essential.
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Why the study?
Familial dilated cardiomyopathy exhibits incomplete penetrance, variable expression, and genetic heterogeneity, complicating clinical and genetic diagnosis and management.
Key Points
- To evaluate the clinical features, genetic mechanisms, and screening strategies associated with familial dilated cardiomyopathy.
- Reviewed clinical and molecular evidence detailing genetic architecture, inheritance patterns, and phenotypic presentation in familial dilated cardiomyopathy.
- Evaluated diagnostic standards, family cascade testing strategies, and longitudinal cardiological monitoring protocols.
- Familial dilated cardiomyopathy demonstrates high genetic heterogeneity, most commonly showing autosomal dominant inheritance with mutations in structural, sarcomeric, and nuclear envelope genes.
- Specific gene alterations, particularly in TTN and LMNA, are linked to distinct risks of adverse ventricular remodeling, malignant arrhythmias, and premature heart failure.
PICO
P
Population
Familial dilated cardiomyopathy
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Key expert perspectives
Captured external expert commentary on this paper, strongest first. Original sources are linked where available.
“In their interesting and recent state-of-the-art study, Burkett and Hershberger stated that 'familial dilated cardiomyopathy demonstrates incomplete penetrance, variable expression, and significant locus and allelic heterogeneity, making clinical and genetic diagnosis complex.' The statement clearly describes a key problem encountered during the genetic dissection of human DCM. This problem reaches beyond the fact that multiple genes may cause the DCM phenotype in humans and that further loci shall be revealed in the future.”
Implication
Clinical review demonstrates genetic heterogeneity and variable penetrance in familial dilated cardiomyopathy, highlighting the value of early screening.
Abstract
Idiopathic dilated cardiomyopathy (IDC) is characterized by left ventricular dilatation and systolic dysfunction after known causes have been excluded. Idiopathic dilated cardiomyopathy occurring in families, or familial dilated cardiomyopathy (FDC), may occur in 20% to 50% of IDC cases. Sixteen genes have been shown to cause autosomal dominant FDC, but collectively may account for only a fraction of genetic causation; it is anticipated that additional genes causative of FDC will be discovered. Familial dilated cardiomyopathy demonstrates incomplete penetrance, variable expression, and significant locus and allelic heterogeneity, making clinical and genetic diagnosis complex. Echocardiographic and electrocardiographic screening of first-degree relatives of individuals with IDC and FDC is indicated, as detection and treatment are possible before the onset of advanced symptomatic disease. Genetic counseling for IDC and FDC is also indicated to assist with family evaluations for genetic disease and with the uncertainty and anxiety surrounding the significance of clinical and genetic evaluation. Genetic testing is not yet commonly available, but its emergence will provide new opportunities for presymptomatic diagnosis.
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Cite This Study
Burkett et al. (2005) conducted a review in Familial dilated cardiomyopathy. Familial dilated cardiomyopathy accounts for 20% to 50% of idiopathic cases and involves significant genetic heterogeneity, making clinical screening and genetic counseling of relatives essential.