Genetic heterogeneity of left-ventricular noncompaction cardiomyopathy

Area of Science:

• Cardiology
• Genetics
• Pathology

Background:

• Isolated noncompaction of the ventricular myocardium (INVM), also known as spongy myocardium, is a rare cardiomyopathy.
• It presents in neonatal, childhood, and adult forms, commonly involving systolic dysfunction and deep ventricular trabeculations.
• While often sporadic, INVM can stem from chromosomal abnormalities or have familial incidence.

Purpose of the Study:

• To elucidate the genetic underpinnings of Isolated noncompaction of the ventricular myocardium.
• To review known genotype-phenotype correlations associated with this cardiomyopathy.
• To provide a comprehensive overview of the genetic background of INVM.

Main Methods:

• Literature review of genetic factors and genotype-phenotype correlations in Isolated noncompaction of the ventricular myocardium.
• Analysis of reported mutations in genes associated with INVM.
• Synthesis of information on familial and sporadic forms of the disease.

Main Results:

• Identified key mutated genes implicated in INVM, including G4.5 (tafazzin), DTNA, FKBP-12, lamin A/C, and Cypher/ZASP.
• Highlighted that the majority of adult INVM cases follow an autosomal dominant inheritance pattern.
• Noted associations between INVM genotypes and phenotypes such as Becker muscular dystrophy, Emery-Dreifuss muscular dystrophy, and Barth syndrome.

Conclusions:

• Genetic mutations are central to the pathogenesis of Isolated noncompaction of the ventricular myocardium.
• Understanding these genetic factors and their associated phenotypes is crucial for diagnosis and management.
• Further research into the genetic landscape of INVM can improve diagnostic accuracy and therapeutic strategies.