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. 2022 Jul 29;11(15):4423.
doi: 10.3390/jcm11154423.

Multicentric Carpotarsal Osteolysis Syndrome Associated Nephropathy: Novel Variants of MAFB Gene and Literature Review

Stefania Drovandi  1 , Francesca Lugani  2 , Olivia Boyer  3 , Edoardo La Porta  1 , Paolo Giordano  1 , Aurélie Hummel  3 , Bertrand Knebelmann  4 , Joséphine Cornet  4 , Genevieve Baujat  5 , Beata S Lipska-Ziętkiewicz  6   7 , Gian Marco Ghiggeri  1   2 , Gianluca Caridi  2 , Andrea Angeletti  1   2
Affiliations

Multicentric Carpotarsal Osteolysis Syndrome Associated Nephropathy: Novel Variants of MAFB Gene and Literature Review

Stefania Drovandi et al. J Clin Med. .

Abstract

Multicentric carpo-tarsal osteolysis (MCTO) is a rare osteolysis syndrome mainly involving carpal and tarsal bones usually presenting in early childhood. MCTO has autosomal dominant inheritance with heterozygous mutation in the MAFB gene. The skeletal disorder is often associated with chronic kidney disease. Data on clinical characterization and best treatment option of MCTO-associated nephropathy are scarce and mostly limited to case reports. With the aim to better define the phenotype and long-term outcomes of MCTO-associated nephropathy, we launched an online survey through the Workgroup for hereditary glomerulopathies of the European Rare Kidney Disease Network (ERKNet). Overall, we collected clinical and genetic data of 54 MCTO patients, of which 42 previously described and 12 new patients. We observed a high rate of kidney involvement (70%), early age of kidney disease onset, nephrotic-range proteinuria, and a kidney survival around of 40% at long-term follow-up. Our finding confirmed the heterogeneity of clinical manifestations and widen the spectrum of phenotypes resulting from MCTO-associated nephropathy. Furthermore, we report the first case of complete remission after treatment with cyclosporine A. We demonstrated that multidisciplinary care is essential for MCTO patients and early referral to nephrologists is therefore warranted to facilitate prompt treatment.

Keywords: glomerulonephritis; hereditary podocytopathy; monogenic kidney disease; multicentric carpotarsal syndrome; nephrotic syndrome; renal failure.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic representation of case selection process.
Figure 2
Figure 2
Kidney failure-free survival until adulthood.
Figure 3
Figure 3
Proteinuria changes over time of CyA-sensitive patient. Proteinuria (mg/day) is reported over time (months) since the diagnosis of MCTO disorder. Red circle corresponds to the kidney biopsy.
See this image and copyright information in PMC

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