Genomics of pediatric cardiomyopathy

Area of Science:

• Pediatric cardiology
• Genetics
• Molecular biology

Background:

• Cardiomyopathy is a primary cause of heart failure and transplantation in children.
• Genetic variants significantly contribute to diverse cardiomyopathy subtypes.
• Genetic testing is becoming standard for diagnosis, management, and risk stratification.

Purpose of the Study:

• To explore the role of genetic variants in pediatric cardiomyopathy and cardioskeletal myopathies.
• To investigate genetic factors influencing myocarditis presentation and outcomes.
• To highlight the need for improved understanding of genetic variants of uncertain significance.

Main Methods:

• Review of clinical and research genetic testing data in pediatric cardiomyopathy.
• Analysis of genetic mutations in sarcomere, cytoskeletal, Z-disk, and sarcolemma proteins.
• Examination of genetic factors in myocarditis, including risk alleles and associations with cardiomyopathy.

Main Results:

• Mutations in sarcomere, cytoskeletal, Z-disk, and sarcolemma proteins cause overlapping cardioskeletal myopathies via common pathways.
• Genetic factors likely mediate the development and course of myocarditis, with potential links to undiagnosed arrhythmogenic cardiomyopathy.
• Variants of uncertain significance pose a challenge in genetic testing interpretation.

Conclusions:

• Gene mutations in muscle proteins create common pathways for cardiomyopathy and skeletal myopathy.
• Genetic testing is valuable for pediatric myocarditis, especially in high-risk groups.
• Advancements in bioinformatics are needed to clarify the clinical impact of uncertain genetic variants.