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Mesangial IgA glomerulonephritis in HLA-identical brothers
Insights
Two HLA-identical brothers with IgA glomerulonephritis suggest a genetic link to the disease. This finding supports a theory of a genetically controlled immune response in IgA nephropathy.
Area of Science:
- Nephrology
- Immunology
- Genetics
Background:
- Mesangial Immunoglobulin A (IgA) glomerulonephritis is a common cause of glomerulonephritis.
- Hereditary nephritis typically presents with nerve deafness and ocular defects, which were absent in these patients.
- The family history did not suggest classical hereditary nephritis.
Purpose of the Study:
- To report on two HLA-identical brothers diagnosed with mesangial IgA glomerulonephritis.
- To investigate potential genetic factors contributing to IgA glomerulonephritis.
- To explore the association between HLA phenotypes and IgA nephropathy.
Main Methods:
- Case report of two brothers with mesangial IgA glomerulonephritis.
- Analysis of Human Leukocyte Antigen (HLA) phenotypes.
- Clinical evaluation including renal function and urinalysis.
Main Results:
- Both brothers shared identical HLA phenotypes (A10 - A32 - B13 - B35).
- Patient 1 required chronic hemodialysis by age 20.
- Neither patient exhibited nerve deafness, ocular defects, or complement abnormalities.
Conclusions:
- The identical HLA phenotypes in HLA-identical brothers strongly suggest a genetic linkage in mesangial IgA glomerulonephritis.
- The presence of the B35 antigen, previously suspected in this disease, warrants further investigation.
- These findings support the hypothesis of a genetically determined aberrant immune response in IgA nephropathy.
Abstract:
Two HLA identical brothers with mesangial IgA glomerulonephritis are reported. Patient 1 developed gross hematuria at age 12 and required chronic hemodialysis at age 20. Patient 2 presented at age 21 with gross hematuria and normal renal function, the follow up period is only 9 months. Neither of these patients had nerve deafness, ocular defects or complement abnormalities. The family history did not support a diagnosis of classical hereditary nephritis, but a genetic linkage is strongly suggested by the identical HLA phenotypes of these brothers (A10 - A32 - B13 - B35). The B35 antigen has previously been suspected to be linked to this disease. These observations strongly support the hypothesis of an aberrant, genetically controlled, immune response, in patients with mesangial IgA glomerulonephritis.