HLA-DR3 antigen linkage in patients with hypertrophic obstructive cardiomyopathy
1986
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.
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