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Histocompatibility determinants in childhood postinfectious encephalomyelitis
R C Woody1, R W Steele, R K Charlton
1Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock.
Insights
Children with postinfectious encephalomyelitis share human leukocyte antigen (HLA) determinants with multiple sclerosis patients. This suggests a potential genetic predisposition in children to this demyelinating disease.
Area of Science:
- Neurology
- Immunogenetics
- Pediatrics
Background:
- Postinfectious encephalomyelitis (PIE) and multiple sclerosis (MS) exhibit similar clinical, immunological, and neuroradiographic features.
- Human leukocyte antigen (HLA) systems are critical in immune response and disease susceptibility.
Purpose of the Study:
- To investigate the association between specific HLA determinants and postinfectious encephalomyelitis in children.
- To explore potential shared genetic predispositions between PIE and MS.
Main Methods:
- Case-control study design.
- Analysis of HLA antigen and genotype frequencies in six white children diagnosed with PIE.
- Comparison of HLA determinant prevalence against a control population using relative risk (RR) calculations.
Main Results:
- Children with PIE showed a significantly higher prevalence of specific HLA determinants (A3, B7, DR2) and their combinations (A3B7, A3DR2, B7DR2, A3B7DR2) compared to controls.
- Elevated relative risks were observed for these HLA associations, indicating a strong statistical link.
Conclusions:
- The findings suggest that children diagnosed with PIE may have a genetic predisposition to this demyelinating condition.
- While shared HLA determinants exist between PIE and MS in this cohort, further research with larger sample sizes is necessary to confirm a common genetic susceptibility.
Abstract:
Postinfectious encephalomyelitis and multiple sclerosis have clinical, immunologic, and neuroradiographic similarities. We studied HLA determinants in six white children consecutively diagnosed with postinfectious encephalomyelitis. Each of the children had HLA determinants which have been associated with multiple sclerosis. Relative risk (RR) calculations demonstrated that these antigens and genotypes occurred significantly more often in patients with postinfectious encephalomyelitis than in the control population (A3, RR 6.14; B7, RR 6.14; DR2, RR 4.51; A3B7, RR 9.36; A3DR2, RR 5.83; B7DR2, RR 6.13; A3B7DR2, RR 10.90). These data suggest that children with postinfectious encephalomyelitis are genetically predisposed to this demyelinating disease. Although the same HLA determinants were found in these patients as in those with multiple sclerosis, studies of a larger number of postinfectious encephalomyelitis patients will be needed before it can be concluded that the two diseases share a common genetic propensity.