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Heart. 2010 Dec;96(24):1980-4. doi: 10.1136/hrt.2010.200402.

Insights into genotype-phenotype correlation in hypertrophic cardiomyopathy. Findings from 18 Spanish families with a single mutation in MYBPC3.

Author information

1
Department of Cardiology, University Hospital Virgen Arrixaca, Murcia, Spain.

Abstract

BACKGROUND:

Mutations in the cardiac myosin-binding protein C (MYBPC3) gene are frequently found as a cause of hypertrophic cardiomyopathy (HCM). However, only a few studies have analysed genotype-phenotype correlations in small series of patients. The present study sought to determine the clinical characteristics, penetrance and prognosis of HCM with an identical mutation in MYBPC3.

METHODS:

154 non-related patients with HCM (aged 55±16 years, 100 (64.9%) males) were studied. 18 (11.7%) were found to have an identical mutation in the MYBPC3 gene (IVS23+1G→A). Pedigree analysis, including both clinical evaluation and genotyping, was performed.

RESULTS:

152 individuals (mean age 37±18 years, 53.3% males) from 18 families were evaluated. 65 carriers of the IVS23+1G→A mutation were identified, 61.5% of whom met HCM diagnostic criteria. Penetrance of the disease increased with age, with 50% affected at 46 years of age. Males tended to develop the disease earlier than females. 7 (15.6%) had systolic dysfunction. Compared with the rest of the HCM cohort, probands with the mutation had more hypertrophy and were younger at diagnosis. There was a trend towards a reduced survival free from sudden death (SD) (HR 1.71; 95% CI 0.98 to 2.98, p=0.059). There were 17 SD cases in 12 families with the mutation.

CONCLUSIONS:

The MYBPC3 IVS23+1G→A mutation is associated with middle-age onset disease and poor outcome, with a significant proportion of patients developing systolic impairment and a high SD risk profile.

PMID:
21088121
DOI:
10.1136/hrt.2010.200402
[Indexed for MEDLINE]

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