What is the role or genetics in the etiology of celiac disease?

Updated: Oct 10, 2018
  • Author: Stephan U Goebel, MD; Chief Editor: BS Anand, MD  more...
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Answer

Genetics play an important role in celiac disease. The incidence of celiac disease in relatives of patients with celiac disease is significantly higher than in the general population. The prevalence in first-degree relatives of patients with celiac disease is approximately 10%. Concordance for the disease in monozygotic twins approaches 75% and is approximately 30% for first-degree relatives.

Gliadin binds to HLA-DQ2 heterodimers or HLA-DQ8 heterodimers found in 90-95% and 5-10% of patients with celiac disease, respectively. HLA-DQ2 and HLA-DQ8 are present on the surface of antigen-presenting cells in the lamina propria, and binding of gliadin leads to the expression of the proinflammatory cytokine interferon gamma and the activation of CD4+ T lymphocytes.


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