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HLA-DR3 antigen linkage in patients with hypertrophic obstructive cardiomyopathy
Insights
Genetic factors may play a role in hypertrophic obstructive cardiomyopathy (HOCM). The study found a significant association between HLA-DR3 and HOCM, suggesting immunogenetic factors in its pathogenesis.
Area of Science:
- Immunogenetics
- Cardiology
- Human Genetics
Background:
- Hypertrophic obstructive cardiomyopathy (HOCM) is a complex cardiac condition.
- The role of genetic factors in HOCM pathogenesis requires further investigation.
Purpose of the Study:
- To investigate the potential involvement of genetic factors in HOCM.
- To determine Human Leukocyte Antigen (HLA) specificities in Italian HOCM patients and their relatives.
Main Methods:
- HLA typing (HLA-A, HLA-B, HLA-C, HLA-DR) was performed on 12 Italian HOCM patients.
- HLA typing was also conducted on healthy family members of one patient.
- Echocardiographic examinations were used to assess cardiac hypertrophy.
Main Results:
- HLA-DR3 was significantly more prevalent in HOCM patients (50%) compared to normal controls (17.1%; p = 0.023).
- The relative risk for HOCM associated with HLA-DR3 was 4.82.
- Two relatives with HLA-DR3 exhibited equivocal signs of cardiac hypertrophy.
Conclusions:
- HOCM is associated with genes in the HLA-DR region.
- Immunogenetic factors may contribute to the pathogenesis of HOCM.
- Subclinical cardiac abnormalities in relatives suggest a potential early disease stage.
Abstract:
In order to investigate if genetic factors could be involved in the pathogenesis of hypertrophic obstructive cardiomyopathy, we determined HLA-A, HLA-B, HLA-C, and HLA-DR specificities in 12 Italian patients affected with the disease and in healthy family members of one of them. HLA-DR3 was found in 50% of patients as compared to 17.1% of normal control subjects (p = 0.023, relative risk = 4.82). The two relatives also had HLA-DR3 antigen and, in addition, showed equivocal signs of hypertrophy at echocardiographic examination. Thus hypertrophic obstructive cardiomyopathy is associated with genes in the HLA-DR region, and immunogenetic factors could be involved in the pathogenesis of the disease. Furthermore, the minimal target organ abnormalities in "healthy" relatives could represent a subclinical stage of the disease.