HLA DQ region gene polymorphism associated with primary IgA nephropathy
R H Moore1, G A Hitman, E Y Lucas
1Department of Immunology, London Hospital Medical College, United Kingdom.
Kidney International
|March 1, 1990
Summary
IgA nephropathy (IgAN) risk is linked to specific DQ beta gene polymorphisms, particularly the T2+/T6+ phenotype. This finding suggests a common immunogenetic basis for IgAN and other autoimmune diseases.
Area of Science:
- Immunogenetics
- Molecular Biology
- Nephrology
Background:
- IgA nephropathy (IgAN) is an autoimmune kidney disease.
- Previous research linked IgAN to HLA-DR4.
- Specific DQ beta gene polymorphisms (T2 and T6 fragments) were previously associated with HLA-DR4.
Purpose of the Study:
- To investigate the association between DQ beta gene polymorphisms and IgA nephropathy.
- To determine if the T2+/T6+ phenotype is a risk factor for IgAN.
Main Methods:
- Genotyping for DQ beta gene polymorphisms (T2 and T6 fragments).
- Comparison of T2+/T6+ phenotype frequencies between IgAN patients and healthy controls.
- Analysis of DQ antigen distribution in IgAN patients.
Main Results:
- The T2+/T6+ phenotype was significantly more prevalent in IgAN patients (49%) compared to controls (15%).
- This phenotype was also more common in DR4-positive IgAN patients (72%) than DR4-positive controls (29%).
- The findings suggest a strong association between DQ beta gene polymorphisms and IgAN susceptibility.
Conclusions:
- DQ beta gene polymorphisms, specifically the T2+/T6+ phenotype, are strongly associated with IgA nephropathy.
- These findings support the role of susceptibility genes within or near the DQ subregion in IgAN pathogenesis.
- A shared immunogenetic mechanism may predispose individuals to multiple autoimmune diseases, including IgAN, IDDM, and pemphigus vulgaris.
