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This Increases Your Genetic Risk

chrissy

By chrissy
in Related Issues & Disorders

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chrissy Collaborator
chrissy
Posted

Additional factor in some HLA DR3/DQ2 haplotypes confers a fourfold increased genetic risk of celiac disease

E. Bolognesi1, K. Karell2, S. Percopo3, I. Coto3, L. Greco3, V. Mantovani4, E. Suoraniemi2, J. Partanen2, K. Mustalahti5, M. Mäki5, P. Momigliano-Richiardi1

Although HLA-DQ genes are the major celiac disease (celiac disease) susceptibility genes, results from Finnish families suggest that not all DQ2-encoding haplotypes confer equal susceptibility to celiac disease, implying the effect of other gene(s) in the HLA region. The aim of the present work was to extend and confirm the aforementioned results in a southern European population ( Italian) and to better localize the additional risk factor/s. The association of nine loci spanning the HLA region from DR to HFE, 4.5-Mb telomeric of HLA-A, was tested. The analysis was performed by comparing marker frequencies in DR3-DQ2 haplotypes transmitted and non-transmitted to the affected offspring in 156 Italian celiac disease families selected for having at least one DR3-positive parent. The same analysis was performed independently in 101 Finnish celiac disease families selected with the same criteria. Three alleles, MICA-A5.1, MICB-CA24 and MIB-350, all characteristic of the B8-DR3 extended haplotype, showed a significantly increased frequency in DR3 transmitted haplotypes in the Italian families. DR3 haplotypes carrying the combination of these alleles conferred an approximate fourfold increased celiac disease risk. B8-DR3 transmitted haplotypes were significantly more conserved telomerically down to the MIC-Class I region. Similar results were seen in the Finnish families. The major conclusion that holds true in both populations is that, while DQ2 is an absolute requirement for the development of celiac disease, the presence of an additional genetic factor within the MIC-Class I region confers an approximate 4-fold increased risk of the disease.

i found this when i was looking up dr. fasano and celiac research.

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