Familial Dilated Cardiomyopathy

Area of Science:

• Cardiovascular Genetics
• Genomics and Precision Medicine

Background:

• Human genome sequencing advances have revitalized genetic studies of dilated cardiomyopathy (DCM).
• Interpreting genetic variants and identifying pathogenic mutations in DCM remains challenging due to the vast number of rare variants.
• Genetic factors play a significant role in DCM pathogenesis, with over 100 implicated genes.

Purpose of the Study:

• To explore the role of genetic factors in dilated cardiomyopathy (DCM) pathogenesis.
• To discuss the challenges and advancements in genetic testing for DCM.
• To highlight the importance of genotype-phenotype correlations in clinical management and precision medicine.

Main Methods:

• Review of current literature on human genome sequencing and dilated cardiomyopathy genetics.
• Analysis of genetic testing sensitivity and diagnostic yield in DCM.
• Correlation of genetic variants with clinical phenotypes, including age of onset, penetrance, and extra-cardiac features.

Main Results:

• Genetic testing sensitivity for DCM is approximately 25-40%, even in familial cases.
• Emerging data reveals variability in DCM onset, penetrance, and associated features based on genotype.
• Specific gene variants are linked to high arrhythmogenicity and rapid heart failure progression.

Conclusions:

• Identifying causative variants in DCM enables predictive testing and preventative interventions for at-risk family members.
• Advanced imaging techniques aid in detecting pre-clinical dysfunction in asymptomatic carriers.
• Further research is needed to optimize genotype-based therapies and precision medicine strategies for familial DCM.