HLA-DQ distribution and risk assessment of celiac disease in a Spanish center

• Eva Martínez-Ojinaga ^[1] ; Manuel Molina ^[1] ; Isabel Polanco ^[1] ; Elena Urcelay ^[2] ; Concepción Núñez ^[2]
  1. [1] Hospital Universitario La Paz

     Hospital Universitario La Paz

     Madrid, España

     
  2. [2] Hospital Clínico San Carlos de Madrid

     Hospital Clínico San Carlos de Madrid

     Madrid, España

     
• Localización: Revista Española de Enfermedades Digestivas, ISSN-e 2340-4167, ISSN 1130-0108, Vol. 110, Nº. 7, 2018, págs. 421-426
• Idioma: inglés
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• Resumen

  • Aims: celiac disease is a multisystem immune-mediated disease triggered by gluten in genetically susceptible individuals. The HLA-DQ2 and/or HLA-DQ8 heterodimers are encoded by the main genetic predisposing factors and their presence is required for the development of the immunological response that leads to the disease. However, the HLA-conferred risk can differ within different countries. The aim of the study was to analyze the risk of Spanish children to develop celiac disease according to their HLA-DQ genotype. Methods: a retrospective observational case-control study was performed using a sample of 475 celiac patients and 628 controls. Results: children carrying the HLA-DQ2.5 had the highest disease risk, especially those with two HLA-DQB1*02 alleles. A similar high risk was observed in HLA-DQ8 homozygous individuals. A risk conferred by HLA-DQ8 in heterozygosity and HLA-DQ2.2 was also found and two patients with celiac disease carried the HLA-DQ7.5 haplotype as the only HLA risk factor. Conclusions: there are four genetic risk categories according to the HLA-DQ genotype. The HLA-DQ7.5 genotype does not confer risk but should not be used to rule out celiac disease when a high suspicion of the disease exists. These findings could be relevant to determine when to perform serological screening in asymptomatic subjects at risk of celiac disease.