A Novel Loss-of-function Mutation in MYBPC3 Causes Familial Hypertrophic Cardiomyopathy with Extreme Intrafamilial...

Area of Science:

• Genetics
• Cardiology
• Molecular Biology

Background:

• Cardiomyopathies, particularly hypertrophic cardiomyopathy (HCM), are heart muscle diseases often caused by genetic mutations.
• MYBPC3 gene mutations are a common cause of HCM, but exhibit significant variability in disease presentation.
• Understanding genetic underpinnings is crucial for diagnosing and managing HCM.

Purpose of the Study:

• To investigate the genetic cause of hypertrophic cardiomyopathy in a Chinese patient.
• To identify novel mutations in the MYBPC3 gene associated with HCM.
• To evaluate the utility of whole exome sequencing in diagnosing familial HCM.

Main Methods:

• Whole exome sequencing was performed on a patient diagnosed with HCM.
• Genetic variant analysis was conducted to identify mutations in the MYBPC3 gene.
• Segregation analysis was performed within the patient's family.

Main Results:

• A novel heterozygous deletion (c.3781_3785delGAGGC) in exon 33 of the MYBPC3 gene was identified in the proband.
• This deletion results in a frameshift mutation (p.Glu1261Thrfs*3), predicted to produce a truncated MYBPC3 protein.
• The variant was found in the proband's father but not in the mother, consistent with familial inheritance.

Conclusions:

• A novel MYBPC3 gene deletion is associated with hypertrophic cardiomyopathy in this Chinese family.
• Whole exome sequencing is a valuable tool for the molecular diagnosis of familial HCM.
• Further research is needed to understand the phenotypic heterogeneity associated with MYBPC3 mutations.