Genetic structure of IDDM1: two separate regions in the major histocompatibility complex contribute to susceptibility or protection. Belgian Diabetes Registry.
We analyzed 11 markers in the IDDM1 region in 120 IDDM patients and 83 healthy control subjects who were fully matched for the highest risk HLA-DQA1*0301-DQB1 *0302/DQA1*0501-DQB1*0201 genotype. Our study provides strong evidence that two regions in the major histocompatibility complex contribute to IDDM susceptibility or protection. First, despite selection for highest IDDM-associated risk DQ genotypes, this region displays extensive linkage disequilibrium (LD) differences between IDDM patients and control subjects. A second critical region was mapped around the microsatellite locus D6S273 centromeric of TNF, and it is approximately 200 kb in size. LD analysis shows that "diabetogenic haplotypes" may have resulted from a recombination telomeric of D6S1014 in the region of D6S273 and TNFa. Haplotype analysis using HLA and microsatellite loci refines IDDM risk assessment in carriers of the HLA-DQ highest risk genotype.
Hanifi Moghaddam
P
P
Department of Immunohematology and Blood Bank, University Hospital, Leiden, The Netherlands.
de Knijf
P
P
Roep
B O
BO
Van der Auwera
B
B
Naipal
A
A
Gorus
F
F
Schuit
F
F
Giphart
M J
MJ
D000328:Adult; D000483:Alleles; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D005819:Genetic Markers; D005838:Genotype; D006683:HLA-DQ Antigens / Q000235:genetics; D059848:HLA-DQ alpha-Chains; D059866:HLA-DQ beta-Chains; D006239:Haplotypes; D006801:Humans; D015810:Linkage Disequilibrium; D008285:Major Histocompatibility Complex; D008297:Male; D018895:Microsatellite Repeats; D016133:Polymerase Chain Reaction; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics
D005819:Genetic Markers; D006683:HLA-DQ Antigens; D059848:HLA-DQ alpha-Chains; D059866:HLA-DQ beta-Chains; C069050:HLA-DQA1 antigen; C069051:HLA-DQB1 antigen; D014409:Tumor Necrosis Factor-alpha