IgA-nephropathy is seen in –
**Core Concept**
IgA-nephropathy, also known as Berger's disease, is a kidney disease characterized by the deposition of IgA antibodies in the glomeruli, leading to inflammation and damage. This condition is a form of glomerulonephritis, which involves the immune system attacking the glomeruli, the filtering units of the kidneys.
**Why the Correct Answer is Right**
IgA-nephropathy is a condition where IgA antibodies, a type of immunoglobulin, are deposited in the glomeruli, triggering an immune response and inflammation. This leads to the activation of complement pathways, such as the classical pathway, which results in the formation of immune complexes and the release of pro-inflammatory cytokines. The deposition of IgA antibodies in the glomeruli is due to the abnormal production or clearance of IgA, leading to an accumulation of these antibodies in the kidneys.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because IgA-nephropathy is not typically associated with the deposition of IgG antibodies.
**Option B:** This is incorrect because IgA-nephropathy is not a form of membranous nephropathy, which is characterized by the deposition of immune complexes on the epithelial side of the glomerular basement membrane.
**Option C:** This is incorrect because IgA-nephropathy is not a form of diabetic nephropathy, which is a complication of diabetes mellitus that affects the kidney's ability to filter waste and excess fluids.
**Clinical Pearl / High-Yield Fact**
IgA-nephropathy is often associated with the presence of hematuria, particularly after an upper respiratory tract infection, and can progress to end-stage renal disease if left untreated. Early diagnosis and treatment are critical to prevent long-term kidney damage.
**Correct Answer:** D.