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Published on: August 8, 2022
Clinical Variability Including Non-Dilated Left Ventricular and Dilated Cardiomyopathy in a Pedigree With an
Carmela Fusco1, Sandra Mastroianno2, Silvia Morlino1
1Inborn Errors of Morphogenesis Research Unit and Division of Medical Genetics, Fondazione IRCCS-Casa Sollievo Della Sofferenza, San Giovanni Rotondo, Italy.
A microdeletion in the CTNNA3 gene causes variable cardiomyopathies, including non-dilated left ventricle cardiomyopathy and dilated cardiomyopathy. This finding implicates CTNNA3 in hereditary heart conditions.
Area of Science:
- Genetics and Molecular Biology
- Cardiology
- Human Genetics
Background:
- CTNNA3 encodes alpha T-catenin, crucial for myocardial integrity.
- Variants in CTNNA3 are linked to arrhythmogenic right ventricular cardiomyopathy and neurodevelopmental disorders.
- The role of structural CTNNA3 variations in cardiomyopathies remains under investigation.
Purpose of the Study:
- To investigate the genetic basis of a variable heart phenotype in a multiplex family.
- To identify the specific genetic alteration responsible for co-segregating cardiomyopathies.
- To confirm CTNNA3 as a candidate gene for hereditary cardiomyopathies.
Main Methods:
- Utilized XONarray for initial identification of a microdeletion.
- Employed long-read sequencing for detailed characterization of the deletion.
- Performed segregation analysis within the affected family.
Main Results:
- A ~60 kb intragenic microdeletion of CTNNA3 was identified.
- The deletion involved exon 9, resulting in the loss of 153 amino acids and disruption of the alpha-catenin/vinculin-like domain.
- This deletion co-segregated with non-dilated left ventricle cardiomyopathy and dilated cardiomyopathy in affected family members.
Conclusions:
- The identified CTNNA3 microdeletion is strongly associated with hereditary cardiomyopathies.
- Disruption of the alpha-catenin/vinculin-like domain impacts cardiac function.
- CTNNA3 is confirmed as a significant candidate gene for familial heart muscle diseases.
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