Effect of sarcomere and mitochondria-related mutations on myocardial fibrosis in patients with hypertrophic cardiomyopathy.

ABSTRACT:

Background

Myocardial fibrosis is an important prognostic factor in hypertrophic cardiomyopathy (HCM). However, the contribution from a wide spectrum of genetic mutations has not been well defined. We sought to investigate effect of sarcomere and mitochondria-related mutations on myocardial fibrosis in HCM.

Methods

In 133 HCM patients, comprehensive genetic analysis was performed in 82 nuclear DNA (33 sarcomere-associated genes, 5 phenocopy genes, and 44 nuclear genes linked to mitochondrial cardiomyopathy) and 37 mitochondrial DNA. In all patients, cardiovascular magnetic resonance (CMR) was performed, including 16-segmental thickness, late gadolinium enhancement (LGE), native and post-T1, extracellular volume fraction (ECV), and T2, along with echo-Doppler evaluations.

Results

Patients with sarcomere mutation (SM, n?=?41) had higher LGE involved segment, % LGE mass, ECV and lower post-T1 compared to patients without SM (n?=?92, all p??0.05). However, MM group did not have significantly higher ECV or LGE amount than non-mutation group.

Conclusions

SMs are significantly related to increase in myocardial fibrosis. Although, some HCM patients had pathogenic MMs, it was not associated with an increase in myocardial fibrosis.

SUBMITTER: Chung H 

PROVIDER: S-EPMC7931545 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature