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HLA DQA1-DQB1 genotypes in Bedouin families with celiac disease

Susan L Neuhausen1, Zvi Weizman, Nicola J Camp

  • 1Department of Medical Informatics, University of Utah, Salt Lake City 84108, USA. susan@genepi.med.utah.edu

Human Immunology
|June 1, 2002
PubMed

Insights

Celiac disease (CD) susceptibility is strongly linked to specific human leukocyte antigen (HLA) genes. This study found HLA-DQA1 DQB1 genotypes associated with CD in Bedouin families mirror those in European populations.

Area of Science:

  • Genetics
  • Immunology
  • Gastroenterology

Background:

  • Celiac disease (CD) is an autoimmune disorder with a strong genetic component.
  • Human leukocyte antigen (HLA) genes, particularly HLA-DQA1 and DQB1, are key genetic factors in CD susceptibility.
  • The primary risk genotypes are HLA-DQA1*05 DQB1*02 (DQ2) and HLA-DQA1*03 DQB1*0302 (DQ8).

Purpose of the Study:

  • To investigate the association of HLA-DQA1 and DQB1 genotypes with celiac disease in Bedouin families.
  • To compare the genetic risk factors for CD in a Bedouin population with those observed in European populations.

Main Methods:

  • DNA samples from nine multiplex and one simplex Bedouin celiac disease families were genotyped for HLA DQA1 and DQB1.
  • Transmission disequilibrium testing (TDT) was used to analyze the over-representation of specific HLA genotypes in affected individuals.

Main Results:

  • A significant over-representation of the HLA-DQA1*05 DQB1*02 (DQ2) genotype was observed in affected individuals (p = 0.0089).
  • The HLA-DQA1*03 DQB1*0302 (DQ8) genotype also showed an over-representation (p = 0.078).
  • The distribution of high-risk HLA DQA1 DQB1 genotypes in Bedouin families was similar to that found in Northern and Southern Europeans.

Conclusions:

  • The study confirms the strong association between specific HLA-DQA1 DQB1 genotypes and celiac disease in the Bedouin population.
  • The findings suggest that the primary genetic risk factors for celiac disease are consistent across different ethnic groups, including Bedouins and Europeans.

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