Abstract
In UC, as in many other diseases with a suspected autoimmune etiology or pathogenesis, an association with certain HLA class II specificities has been investigated. In the Japanese, several studies have shown a positive association with DR2, but in Caucasian populations the results are conflicting. Therefore we undertook a study of HLA class II gene association with UC in a large group of white Madrid patients and ethnically matched controls, using molecular biology techniques to investigate whether any allelic subspecificity within the HLA-DR2 group is associated with susceptibility to or protection against UC. Patients with ulcerative colitis (n = 107) and 200 controls were typed using molecular, DNA-based techniques for HLA-DRB1, DQA1 and DQB1 alleles. Those HLA-DR2+ were then specifically typed for the individual alleles within the HLA-DR2 group. We observed a positive association with HLA-DR15 (P=0.021) and its subtype DRB1*1501 (P=0.018). HLA-DRB1*1502 was also increased, although its frequency both in patients and controls was very low. When the HLA-DR2+ population was studied, HLA-DRB1*1601 was significantly decreased in patients (P=0.026). Both HLA-DR3 (P=0.002) and HLA-DQB1*02 (P=0.001) were also negatively associated...Continue Reading
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