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Thin Basement Membrane: An Underrated Cause of End-Stage Renal Disease

Martina Uzzo1,2, Gabriella Moroni2,3, Claudio Ponticelli4

  • 1Department of Clinical and Experimental Sciences, University of Milano-Bicocca, Monza, Italy.

Nephron
|March 7, 2023
PubMed

Insights

Thin basement membrane (TBM) disease, often linked to collagen IV gene variants, typically presents with isolated hematuria. However, some patients may develop progressive kidney disease, necessitating better diagnostic approaches.

Area of Science:

  • Nephrology
  • Genetics
  • Pathology

Background:

  • Thin basement membrane (TBM) disease is a glomerular disorder defined by diffuse thinning of the glomerular basement membrane (GBM).
  • While often associated with isolated hematuria and good renal prognosis, TBM can lead to proteinuria and progressive kidney dysfunction.
  • Pathogenic variants in collagen IV genes (COL4A3/COL4A4) are common in TBM and explain diverse clinical phenotypes.

Purpose of the Study:

  • To address the diagnostic challenges in differentiating TBM from other glomerular diseases like Alport syndrome and IgA nephritis (IGAN).
  • To highlight the risk of misdiagnosis and underestimation of progressive kidney disease in TBM patients.
  • To propose a practical clinical approach for better diagnosis and management of TBM.

Main Methods:

  • Review of clinical and histological features of TBM.
  • Analysis of genetic variants in collagen IV genes.
  • Comparison with differential diagnoses including Alport syndrome, IgAN, and focal segmental glomerulosclerosis (FSGS).

Main Results:

  • TBM is characterized by GBM thinning on electron microscopy.
  • Heterozygous pathogenic variants in COL4A3/COL4A4 genes are frequently identified.
  • Differential diagnosis can be challenging, with some patients exhibiting features overlapping with FSGS and IgAN.

Conclusions:

  • Accurate diagnosis and risk stratification for progressive kidney disease in TBM are crucial.
  • A standardized classification and early recognition of renal deterioration are needed.
  • A practical clinical approach is provided to aid in diagnosis and tailor therapeutic strategies.
Keywords:
Alport syndromeCOL4 nephropathiesDysmorphic hematuriaProteinuriaThin basement membrane

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