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HLA-DRB1 and multiple sclerosis in Malta.

G Dean1, T W Yeo, A Goris

  • 1Health Research Board, Dublin, Ireland. hrb@hrb.ie

Neurology
|December 7, 2007
PubMed
Summary
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Multiple sclerosis (MS) is less common in Malta than in Sicily. Despite genetic factors, HLA-DRB1 allele frequencies do not explain this difference in MS prevalence between the islands.

Area of Science:

  • Genetics
  • Epidemiology
  • Neurology

Background:

  • Multiple sclerosis (MS) prevalence is notably lower in Malta compared to neighboring Sicily.
  • Investigating genetic factors, specifically human leukocyte antigen (HLA) alleles, is crucial for understanding MS epidemiology.

Purpose of the Study:

  • To investigate whether lower frequencies of human leukocyte antigen (HLA) susceptibility alleles contribute to the reduced prevalence of multiple sclerosis (MS) in Malta.
  • To compare HLA-DRB1 allele frequencies in the Maltese population with those in Sicily and other European countries.

Main Methods:

  • Genotyping of the HLA-DRB1 locus in 77 Maltese patients with MS and 206 healthy Maltese controls.
  • Comparison of Maltese HLA-DRB1 allele frequencies with existing data from Sicily and other European populations.

Related Experiment Videos

Main Results:

  • The known MS susceptibility allele, HLA-DRB1*15, was confirmed in the Maltese population.
  • The HLA-DRB1*11 allele showed a significant protective effect in Malta.
  • Contrary to expectations, all HLA-DRB1 risk alleles were more frequent in Malta than in Sicily, while HLA-DRB1*11 was less common.

Conclusions:

  • Observed differences in multiple sclerosis prevalence between Malta and Sicily cannot be attributed to variations in background HLA-DRB1 population allele frequencies.
  • The genetic data suggest that higher frequencies of certain HLA-DRB1 alleles in Malta should predict a greater, not lesser, prevalence of MS compared to Sicily.