Abstract：
:HLA-DQB1 is widely considered to be the major histocompatibility complex (MHC) susceptibility gene for type 1 diabetes (T1D). However, since inheritance of the gene in T1D is recessive, the presence of the protective HLA-DQB1 0602 allele with normal nucleotide sequence in some patients raises the question of whether HLA-DQB1 is not the susceptibility locus itself but merely a good marker. HLA-DQB1 0602 is part of a conserved extended haplotype (CEH) [HLA-B7, SC31, DR2] (B7, DR2) with fixed DNA over more than 1Mb of genomic DNA that normally carries a protective allele at the true susceptibility locus. We postulated that, in patients with HLA-DQB1 0602, the protective allele at the susceptibility locus has been replaced by a susceptibility allele through an ancient crossover at meiosis centromeric to HLA-DQB1. We analyzed single nucleotide polymorphisms (SNPs) distinguishing the HLA-DQA2 (the first expressed gene centromeric to HLA-DQB1) allele on the normal HLA-B7, DR2 CEH from those on susceptibility CEHs in T1D patients and controls with HLA-DQB1 0602. All but 1 of 20 healthy control HLA-DQB1 0602 haplotypes had identical (consensus) first intron HLA-DQA2 5-SNP haplotypes. Fifteen of 19 patients with HLA-DQB1 0602 were homozygous for 1 or more HLA-DQA2 SNPs differing from consensus HLA-DQA2 SNPs, providing evidence of crossover involving the HLA-DQA2 locus. The remaining 4 patients were heterozygous at all positions and therefore uninformative. The loss of dominant protection usually associated with HLA-DQB1 0602 haplotypes is consistent with a locus centromeric to HLA-DQB1 being a major determinant of MHC-associated susceptibility, and perhaps the true T1D susceptibility locus.
journal_name
J Autoimmunjournal_title
Journal of autoimmunityauthors
Husain Z,Kelly MA,Eisenbarth GS,Pugliese A,Awdeh ZL,Larsen CE,Alper CAdoi
10.1016/j.jaut.2007.10.006subject
Has Abstractpub_date
2008-06-01 00:00:00pages
266-72issue
4eissn
0896-8411issn
1095-9157pii
S0896-8411(07)00123-0journal_volume
30pub_type
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pub_type： 杂志文章
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pub_type： 杂志文章,评审
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