MHC-EXTENDED HAPLOTYPES IN FAMILIES OF PATIENTS WITH GRAVES-DISEASE

被引:16
|
作者
RATANACHAIYAVONG, S
LLOYD, L
DARKE, C
MCGREGOR, AM
机构
[1] UNIV LONDON KINGS COLL, SCH MED, DEPT MED, LONDON WC2R 2LS, ENGLAND
[2] BLOOD TRANSFUS CTR, TISSUE TYPING LAB, CARDIFF, WALES
关键词
D O I
10.1016/0198-8859(93)90112-E
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
MHC-extended haplotypes were investigated in multiplex families of patients with hyperthyroid GD. Using a combination of both phenotypic (serology and protein electrophoresis) and genotypic (DNA-RFLP) markers, 159 MHC-extended haplotypes extending from HLA-A across the MHC class III (C2, Bf, C4A, and C4B) toward the HLA-DR/DQ complex were deduced from 217 (51 and 166 affected and unaffected) members of 21 families of patients with GD. Thyroid autoantibodies were measured and found positive in 27.1% of 166 clinically euthyroid unaffected members. Extended haplotypes were classified into four categories-affected (n = 40), Aff/Ab+ve (shared haplotype between affected and Ab + ve members, n = 3 1), Ab + ve (n = 29), and Ab - ve (n = 59)-based on the presence and absence of these haplotypes in 51 affected members with GD and 45 and 121 unaffected members who were respectively positive and negative for thyroid autoantibodies. Five recombinations were detected: three were found between HLA-A and B and two between HLA-B and the MHC class III. No recombination was found between or within the MHC class III and class II complex. Though the HLA-DR17 (DRbeta17(1) and DRbeta17(2)) allele was found to be significantly increased in both the affected and the Aff/Ab + ve when compared with the Ab-ve haplotypes (p < 0.042 and p < 0.018), the frequency of the HLA-B8, 2.7-kb SstI-4.5-kb TaqI/C2 Bf*S, 6.4-kb TaqI/C4A*Q0C4B*1, HLA-DR,817'/DQa2-DQbeta2a extended haplotype was found to be significantly increased only in the affected haplotype (p < 0.05). These results suggest that while HLA-DR17 is a susceptibility allele shared between GD and individuals with positive thyroid autoantibodies, the HLA-B8, 2.7-kb SstI-4.5-kb TaqI/5'-3'C2 Bf*S, 6.4-kb TaqI/C4A*Q0B*1, DRbeta17(1)/DQalpha2-DQbeta2a is a disease susceptibility-extended haplotype for Graves' disease.
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页码:99 / 111
页数:13
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