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Modeling of ACTN4-based podocytopathy using Drosophila nephrocytes

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Item Type:Article
Title:Modeling of ACTN4-based podocytopathy using Drosophila nephrocytes
Creators Name:Odenthal, J. and Dittrich, S. and Ludwig, V. and Merz, T. and Reitmeier, K. and Reusch, B. and Höhne, M. and Cosgun, Z.C. and Hohenadel, M. and Putnik, J. and Göbel, H. and Rinschen, M.M. and Altmüller, J. and Koehler, S. and Schermer, B. and Benzing, T. and Beck, B.B. and Brinkkötter, P.T. and Habbig, S. and Bartram, M.P.
Abstract:INTRODUCTION: Genetic disorders are among the most prevalent causes leading to progressive glomerular disease and, ultimately, end-stage renal disease in children and adolescents. Identification of underlying genetic causes is indispensable for targeted treatment strategies and counseling of affected patients and their families. METHODS: Here, we report a boy who presented at four years of age with proteinuria and biopsy-proven focal segmental glomerulosclerosis that was temporarily responsive to treatment with Ciclosporin A. Molecular genetic testing identified a novel mutation in alpha-actinin-4 (p.M240T). We describe a feasible and efficient experimental approach to test its pathogenicity by combining in silico, in vitro, and in vivo analyses. RESULTS: The de novo p.M240T mutation led to decreased alpha-Actinin-4 stability as well as protein mislocalization and actin cytoskeleton rearrangements. Transgenic expression of wild-type human alpha-Actinin-4 in Drosophila melanogaster nephrocytes was able to ameliorate phenotypes associated with the knockdown of endogenous Actinin. In contrast, p.M240T, as well as other established disease variants p.W59R and p.K255E, failed to rescue these phenotypes, underlining the pathogenicity of the novel alpha-Actinin-4 variant. CONCLUSION: Our data highligh that the newly identified alpha-actinin-4 mutation indeed encodes for a disease-causing variant of the protein and promote the Drosophila model as a simple and convenient tool to study monogenic kidney disease in vivo.
Keywords:ACTN4, FSGS, Nephrocyte, Nephrotic Syndrome, Podocyte, Animals, Drosophila
Source:Kidney International Reports
Page Range:317-329
Date:February 2023
Official Publication:https://doi.org/10.1016/j.ekir.2022.10.024
PubMed:View item in PubMed

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