J Nephropathol. 2019;8(3): e30.
doi: 10.15171/jnp.2019.30
  Abstract View: 210
  PDF Download: 127

Case Report

A new complement factor B mutation associated with crescentic C3 glomerulopathy; a case report

Sofia Semedo Coelho 1 * ORCiD, Ana Raquel Fernandes 1, Elsa Soares 1, Patrícia Valério 1, Bruno Matos 2, Helena Romão 2, Mário Góis 2, Helena Sousa 2, Teresa Fidalgo 3, Ana Sofia Natário 1, Carlos Barreto 1

1 Nephrology Department, Centro Hospitalar de Setúbal, Portugal
2 Renal Pathology Department, Hospital Curry Cabral, Portugal
3 Thrombosis and Hemostasis Unit, Centro Hospitalar e Universitário de Coimbra, Portugal
*Corresponding author: Sofia Semedo Coelho, Email: Email: sofiasc17@gmail.com

Abstract

Background: C3 glomerulopathy is a recently described entity classified as complementassociated glomerular disease.

Case Presentation: We report a case of a 48-year-old man referred to the nephrology department for nephrotic syndrome with rapidly progressive kidney failure, acquired partial lipodystrophy and drusen in Bruch’s membrane of the retina. Blood tests showed low C3 and no evidence for autoimmune diseases, monoclonal gammopathy or infection. The renal biopsy revealed a proliferative endocapillary and crescentic glomerulonephritis with glomerular deposits exclusively of C3 and significant interstitial fibrosis. The electronic microscopy was consistent with dense deposit disease. The complement analysis revealed a pathogenic mutation of the complement factor B (CFB) gene not previously described in literature.

Conclusions: The authors report a new mutation of CFB, in a dense deposit disease patient; this finding brings a new insight to the pathogenic pathway of C3 glomerulopathy and possibly to other complement dysregulation associated glomerular diseases. More clinical trials are needed to clarify both the pathogenicity and the optimal treatment for these entities.

Implication for health policy/practice/research/medical education:

The finding of a new mutation of complement factor B together with a haplotype for the complement factor H (CFH) known to confer risk for atypical haemolytic uremic syndrome (AHUS), in a dense deposit disease patient, brings a new insight to the pathogenic pathway of C3 glomerulopathy and possibly to other complement dysregulation associated glomerular diseases. More clinical trials are needed to clarify both the pathogenicity and the optimal treatment for these entities.

Please cite this paper as: Coelho SS, Fernandes AR, Soares E, Valério P, Matos B, Romão H, et al. A new complement factor B mutation associated with crescentic C3 glomerulopathy; a case report. J Nephropathol. 2019;8(3):e30. doi: 10.15171/ jnp.2019.30.

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Submitted: 10 Nov 2018
Accepted: 02 Dec 2018
First published online: 04 Jan 2019
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