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Published on: August 8, 2022
Pediatric restrictive cardiomyopathy associated with a mutation in beta-myosin heavy chain
S M Ware1, M E Quinn, E T Ballard
1Department of Molecular Cardiovascular Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA. stephanie.ware@cchmc.org
Insights
A novel beta-myosin heavy chain gene mutation was identified in an infant with restrictive cardiomyopathy. This finding highlights genetic links between sarcomeric protein mutations and childhood restrictive cardiomyopathy, impacting future treatments.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Background:
- Idiopathic pediatric cardiomyopathy lacks specific therapies, especially the restrictive form with poor prognosis.
- Identifying the etiology of restrictive cardiomyopathy is crucial for targeted treatments and genetic counseling.
Observation:
- A missense mutation in the beta-myosin heavy chain gene was identified in an infant with restrictive cardiomyopathy.
- Three-dimensional protein structure modeling revealed the mutation affects a conserved amino acid in the essential light chain binding region.
Findings:
- This is the first reported case linking a beta-myosin heavy chain gene mutation to infant restrictive cardiomyopathy.
- Sarcomeric protein mutations, typically causing hypertrophic cardiomyopathy in adults, can lead to restrictive physiology in children.
Implications:
- Genetic identification of pediatric cardiomyopathy is vital for improved clinical management and family genetic counseling.
- Understanding the genetic basis may pave the way for novel, disease-specific therapeutic strategies for pediatric restrictive cardiomyopathy.
Abstract:
Most children do not have a known cause of cardiomyopathy which limits the potential for disease-specific therapies. Of the different phenotypic presentations of cardiomyopathy, the restrictive form carries the poorest prognosis and has the lowest rate of identification of etiology. We present the first description of a beta-myosin heavy chain gene mutation in an infant with restrictive cardiomyopathy requiring cardiac transplantation. As demonstrated by three-dimensional protein structure modeling, the missense mutation is in a highly conserved amino acid at the critical binding region for the essential light chain. This case emphasizes that mutations in sarcomeric proteins, which are known to cause hypertrophic cardiomyopathy in adults, may be associated with the development of restrictive physiology in childhood. Identification of the genetic basis of pediatric cardiomyopathy has important implications for management and genetic counseling.
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