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HLA antigens in cardiomyopathic Chilean chagasics
E Llop1, F Rothhammer, M Acuña
1Departamento de Biología Celular y Genética, Facultad de Medicina, Universidad de Chile, Santiago.
Insights
Certain human leukocyte antigen (HLA) types, specifically B40 and Cw3, were less frequent in Chilean individuals with Chagasic cardiomyopathy. This suggests these HLA antigens may offer protection against developing this severe heart condition.
Area of Science:
- Immunogenetics
- Infectious Diseases
- Cardiology
Background:
- Chagas disease, caused by *Trypanosoma cruzi*, affects millions globally.
- Chagasic cardiomyopathy (CCM) is a severe, potentially fatal manifestation of chronic Chagas disease.
- Genetic factors, including human leukocyte antigen (HLA) profiles, are suspected to influence CCM development.
Purpose of the Study:
- To investigate the association between HLA antigen distribution and the presence of chagasic cardiomyopathy in a Chilean cohort.
- To identify potential genetic markers linked to susceptibility or resistance to CCM.
Main Methods:
- Serological testing for Chagas disease in 124 Chilean individuals.
- Subdivision of the cohort based on the presence or absence of chagasic cardiomyopathy.
- Analysis of human leukocyte antigen (HLA) antigen frequencies within these subgroups.
Main Results:
- A significantly lower frequency of the HLA antigen combination B40 and Cw3 was observed in individuals with chagasic cardiomyopathy.
- Conversely, these HLA antigens were more prevalent in individuals without cardiomyopathy.
Conclusions:
- The HLA antigen profile, specifically the presence of B40 and Cw3, may be associated with decreased susceptibility to developing chagasic cardiomyopathy.
- These findings suggest a potential protective role of certain HLA alleles against CCM progression in the Chilean population.
- Further research is warranted to confirm these immunogenetic associations and explore underlying mechanisms.
Abstract:
The distribution of HLA antigens in a sample of 124 Chagas serologically positive Chilean individuals was studied. The sample was subdivided according to the presence or absence of chagasic cardiomyopathy, in order to search for genetic differences associated with this pathological condition. The frequency of antigen B40 in the presence of antigen Cw3 was found to be significantly lower in subjects with cardiomyopathy. We tentatively suggest that the presence of these antigens among noncardiomyopathics is associated with a decreased susceptibility to develop chagasic cardiomyopathy in the Chilean population.