Genetic Risk Factors and Autoantibodies in Type 1 Diabetes

Strategic Insights -

A recent study published in Diabetes-Metabolism Research and Reviews investigated the frequencies of type 1 diabetes-associated gene polymorphisms and their associations with various diabetes-associated autoantibodies in Egyptian children. The research discovered that most children with diabetes were positive for the HLA(DR3)-DQA1*05-DQB1*02 (DR3-DQ2) haplotype, compared to controls. The study also found a low frequency of autoantibodies in children carrying the HLA-DR4-DQ2 risk haplotype, suggesting specific pathogenetic pathways associated with this haplotype.

Key Takeaways:

  • The study aimed to investigate the frequencies of type 1 diabetes-associated gene polymorphisms and their associations with various diabetes-associated autoantibodies in Egyptian children.
  • The research involved 101 children with type 1 diabetes and 160 healthy controls from the same region, who were studied for HLA-DQB1, HLA-DQA1, and HLA-DRB1 (DR4 subtypes) alleles.
  • Most children with diabetes (77.2%) were positive for the HLA(DR3)-DQA1*05-DQB1*02 (DR3-DQ2) haplotype, compared to 26.2% of the controls (OR= 9.5; p < 0.0001).
  • The study found a low frequency of autoantibodies in children carrying the HLA-DR4-DQ2 risk haplotype.
  • The research concluded that the low frequency of autoantibodies in children with HLA-DR4-DQ2 may indicate specific pathogenetic pathways associated with this haplotype.
  • M.I. El-Amir and colleagues from the University of Eastern Finland and other research institutions contributed to this study through their work on genetic risk factors and autoantibodies in type 1 diabetes.

Statistics:

  • 101 children with type 1 diabetes were studied in the research.
  • 160 healthy controls were studied in the research.
  • 77.2% of children with diabetes were positive for the HLA(DR3)-DQA1*05-DQB1*02 (DR3-DQ2) haplotype.
  • 26.2% of controls were positive for the HLA(DR3)-DQA1*05-DQB1*02 (DR3-DQ2) haplotype.
  • The odds ratio (OR) for being positive for the HLA(DR3)-DQA1*05-DQB1*02 (DR3-DQ2) haplotype was 9.5 (p < 0.0001).

Sources:

  • Risk genes and autoantibodies in Egyptian children with type 1 diabetes - low frequency of autoantibodies in carriers of the HLA-DRB1*04:05-DQA1*03-DQB1*02 risk haplotype. Diabetes-Metabolism Research and Reviews, 2015;31(3):287-294.
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