HLA-associated genetic resistance and susceptibility to type I diabetes in French North Africans and French natives.
The distribution of human leukocyte antigen (HLA)-DRB1-DQA1-DQB1 haplotypes was analyzed separately in two distinct French ethnic groups with type I diabetes (T1D), i.e. French North African migrants (n= 64, mean age at diagnosis = 8.25 years) and ancient French natives (n= 60, mean age at diagnosis = 7.42 years). HLA associations were determined by calculating odds ratios (ORs) between patients and two ethnic-matched control populations. Results show highly similar ORs for the conservative DRB1*0301-DQA1*0501-DQB1*0201 haplotype of susceptibility (OR: 3.22 and 3.93 in migrants and natives, respectively) and the DRB1*1501-DQA1*0102-DQB1*0602 haplotype of resistance (OR: 0.05 and 0.03, respectively). In contrast, among the more variable DRB1*04-DQB1*0302 haplotypes of susceptibility, the DRB1*0402 (OR: 3.10 and 32.84) and 0405 (OR: 5.90 and 16.25, respectively) were associated with T1D in migrants and natives, whereas an increase of DRB1*0401, a rare allele in migrants, was significant in natives only. Also, among the DRB1*11-DQA1*0505-DQB1*0301 haplotypes of resistance, the OR observed for DRB1*1104-DQA1*0505-DQB1*0301, common in migrants, was lower (OR: 0.08) than for DRB1*1101-DQA1*0505-DQB1*0301 (OR: 0.32), common in natives. How DRB1*11 subtypes might affect differently the risk conferred by DQA1*0505-DQB1*0301 will be discussed.
Guérin
V
V
Laboratory of Immunology, Robert Debré Hospital, Assistance Publique des Hôpitaux de Paris, 48 boulevard Serurier, 75019 Paris, France. valerie.guerin@rdb.ap-hop-paris.fr
Léniaud
L
L
Pédron
B
B
Guilmin-Crépon
S
S
Tubiana-Rufi
N
N
Sterkers
G
G
D000293:Adolescent; D000352:Africa, Northern / Q000208:ethnology; D044383:Black People; D002648:Child; D002675:Child, Preschool; D003922:Diabetes Mellitus, Type 1 / Q000235:genetics*; D005602:France / Q000208:ethnology; D020022:Genetic Predisposition to Disease; D006680:HLA Antigens / Q000235:genetics*; D006801:Humans; D007223:Infant
D006680:HLA Antigens