[HL-A histocompatibility antigens in children with coeliac disease (author's transl)].

HL-A antigens were determined in 41 unrelated coeliac children and in clinically healthy parents and siblings of 40 of these patients using a lymphocyte microcytotoxicity test. 58.5% of the coeliac patients had phenotype HL-A 8 compared with an HL-A 8 frequency of 16.6% in a control group of 320 unrelated individuals (P less than 0.0005). Excluding five patients not of pure German origin HL-A 8 frequency increases to 63.9%. The increase of HL-A 1 frequency in coeliac patients is attributed to linkage disequilibrium between HL-A 8 and HL-A 1. The haplotype HL-A 1.8 frequency was significantly increased in coeliac children (P less than 0.0001) with frequency elevation also in parents (P approximately 0.025) but not in siblings. Furthermore, an increase in frequency of HL-A 12 and a decreased frequency of HL-A 7 and HL-A 9 was found in coeliac patients. Five clinically healthy siblings had the same HL-A haplotypes as their affected sisters and brothers.