HLA associations in an Arab type 1 diabetic population
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K Behbehani1, E R Richens, N Abdella
1Department of Microbiology, Faculty of Medicine, Kuwait.
Insights
Human Leukocyte Antigen (HLA) gene frequencies, specifically HLA-DR3 and HLA-DR4, are strongly associated with Type 1 diabetes in Arab populations. Certain HLA types show protective effects, while others increase risk.
Area of Science:
- Immunogenetics
- Human Genetics
- Endocrinology
Background:
- Type 1 diabetes mellitus (T1DM) has a known genetic component.
- Human Leukocyte Antigen (HLA) genes play a critical role in immune regulation and are strongly associated with autoimmune diseases like T1DM.
Purpose of the Study:
- To investigate the frequencies of HLA-A, -B, -C, -DR, and -DQ antigens in Arab patients with T1DM in Kuwait.
- To determine the association of specific HLA antigens with T1DM risk in different Arab subgroups (Gulf Arabs and Non-Gulf Arabs).
Main Methods:
- A case-control study was conducted involving 63 Arab patients with T1DM residing in Kuwait.
- HLA antigen typing was performed for HLA-A, -B, -C, -DR, and -DQ loci.
- Relative risk (RR) was calculated to assess the association of HLA antigens with T1DM.
Main Results:
- HLA-DR3 (RR=5.80) and HLA-DR4 (RR=2.87) were positively associated with T1DM in the overall Arab cohort.
- HLA-DR2 (RR=0.16) and HLA-DR5 (RR=0.15) showed negative associations.
- HLA-DQ3 demonstrated a strong positive association in both Gulf (RR=28.11) and Non-Gulf Arabs (RR=6.25).
- HLA-B8 (RR=19.06) was positively associated, while HLA-DRw52 and -DRw53 were increased in Non-Gulf Arabs only.
Conclusions:
- Specific HLA-DR and HLA-DQ alleles are significant risk factors for Type 1 diabetes in Arab populations.
- The genetic associations with T1DM vary between Gulf and Non-Gulf Arab subgroups, highlighting population-specific genetic influences.
Abstract:
We have studied HLA-A, -B, -C, -DR, and -DQ antigen frequencies in 63 Type 1 diabetic Arab patients resident in Kuwait. Both HLA-DR3 (relative risk (RR) = 5.80) and -DR4 (RR = 2.87) showed positive associations with Type I diabetes mellitus in these patients whilst -DR2 (RR 0.16) and -DR5 (RR = 0.15) were negatively associated. The strong positive association with both HLA-DR3 and -DR4 was confirmed in Non-Gulf Arabs (RR = 12.55 and 4.29, respectively) whereas the Gulf Arabs had a significant positive association with HLA-DR3 (RR = 4.41) only. The disease was negatively associated with HLA-DR2 (RR = 0.05) in Gulf Arab patients only and with HLA-DR5 (RR = 0.10) in Non-Gulf Arabs only. HLA-DRw52 and -DRw53 were increased in Non-Gulf Arabs only (RR = 3.14 and 4.63, respectively). In both groups there was strong association with HLA-DQ3 (Gulf, RR = 28.11; Non-Gulf, RR = 6.25). Amongst HLA-A, -B, and -C loci, there was a positive association with HLA-B8 (RR = 19.06).