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Published on: August 8, 2022
MYBPC3 Haplotype Linked to Hypertrophic Cardiomyopathy in Rhesus Macaques (Macaca mulatta)
Robert F Oldt1, Kimberly J Bussey2, Matthew L Settles3
1School of Mathematical and Natural Sciences, Arizona State University at the West Campus, Glendale, Arizona; Evolutionary Biology Graduate Program, School of Life Sciences, Arizona State University at the West Campus, Glendale, Arizona;,
Insights
Researchers identified a genetic risk factor for hypertrophic cardiomyopathy (HCM) in rhesus macaques. A specific MYBPC3 gene variant strongly associates with left ventricular hypertrophy (LVH), offering insights into this inherited heart condition.
Area of Science:
- Genomics
- Cardiovascular Research
- Comparative Medicine
Background:
- Hypertrophic cardiomyopathy (HCM) is an inherited heart condition causing left ventricular hypertrophy (LVH) and sudden cardiac death.
- Genetic factors contribute to HCM susceptibility, but current genetic testing identifies causal mutations in only half of human cases.
- Rhesus macaques with LVH serve as a valuable model for studying HCM's genomic basis.
Purpose of the Study:
- To investigate the genetic underpinnings of severe HCM and sudden cardiac death in rhesus macaques.
- To identify genetic variants associated with left ventricular hypertrophy (LVH) in this animal model.
- To explore the utility of evolutionary genomic data in complex disease studies.
Main Methods:
- A next-generation genotyping assay targeting 7 sarcomeric rhesus genes was employed.
- Amplicon sequencing was performed on 52 macaques with confirmed LVH and 42 unaffected controls.
- Bias-reduced logistic regression was used to analyze genetic associations with LVH.
Main Results:
- A risk haplotype in the rhesus MYBPC3 gene was identified.
- This haplotype, containing an intronic variant, showed a strong association with LVH in homozygous or carrier forms.
- The MYBPC3 gene is frequently disrupted in human and feline HCM, suggesting conserved mechanisms.
Conclusions:
- The study identified a specific MYBPC3 gene variant associated with hypertrophic cardiomyopathy (HCM) in rhesus macaques.
- Leveraging evolutionary genomic data is a practical strategy to minimize population bias in complex disease research.
- This finding provides a comparative genetic model for understanding HCM and sudden cardiac death risk.
Abstract:
In humans, abnormal thickening of the left ventricle of the heart clinically defines hypertrophic cardiomyopathy (HCM), a common inherited cardiovascular disorder that can precede a sudden cardiac death event. The wide range of clinical presentations in HCM obscures genetic variants that may influence an individual's susceptibility to sudden cardiac death. Although exon sequencing of major sarcomere genes can be used to detect high-impact causal mutations, this strategy is successful in only half of patient cases. The incidence of left ventricular hypertrophy (LVH) in a managed research colony of rhesus macaques provides an excellent comparative model in which to explore the genomic etiology of severe HCM and sudden cardiac death. Because no rhesus HCM-associated mutations have been reported, we used a next-generation genotyping assay that targets 7 sarcomeric rhesus genes within 63 genomic sites that are orthologous to human genomic regions known to harbor HCM disease variants. Amplicon sequencing was performed on 52 macaques with confirmed LVH and 42 unrelated, unaffected animals representing both the Indian and Chinese rhesus macaque subspecies. Bias-reduced logistic regression uncovered a risk haplotype in the rhesus MYBPC3 gene, which is frequently disrupted in both human and feline HCM; this haplotype implicates an intronic variant strongly associated with disease in either homozygous or carrier form. Our results highlight that leveraging evolutionary genomic data provides a unique, practical strategy for minimizing population bias in complex disease studies.
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