FAT1 mutations cause a glomerulotubular nephropathy

Heon Yung Gee, Carolin E. Sadowski, Pardeep K. Aggarwal, Jonathan D. Porath, Toma A. Yakulov, Markus Schueler, Svjetlana Lovric, Shazia Ashraf, Daniela A. Braun, Jan Halbritter, Humphrey Fang, Rannar Airik, Virginia Vega-Warner, Kyeong Jee Cho, Timothy A. Chan, Luc G.T. Morris, Charles Ffrench-Constant, Nicholas Allen, Helen McNeill, Rainer BüscherHenriette Kyrieleis, Michael Wallot, Ariana Gaspert, Thomas Kistler, David V. Milford, Moin A. Saleem, Wee Teik Keng, Stephen I. Alexander, Rudolph P. Valentini, Christoph Licht, Jun C. Teh, Radovan Bogdanovic, Ania Koziell, Agnieszka Bierzynska, Neveen A. Soliman, Edgar A. Otto, Richard P. Lifton, Lawrence B. Holzman, Nicholas E.S. Sibinga, Gerd Walz, Alda Tufro, Friedhelm Hildebrandt

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Abstract

Steroid-resistant nephrotic syndrome (SRNS) causes 15% of chronic kidney disease (CKD). Here we show that recessive mutations in FAT1 cause a distinct renal disease entity in four families with a combination of SRNS, tubular ectasia, haematuria and facultative neurological involvement. Loss of FAT1 results in decreased cell adhesion and migration in fibroblasts and podocytes and the decreased migration is partially reversed by a RAC1/CDC42 activator. Podocyte-specific deletion of Fat1 in mice induces abnormal glomerular filtration barrier development, leading to podocyte foot process effacement. Knockdown of Fat1 in renal tubular cells reduces migration, decreases active RAC1 and CDC42, and induces defects in lumen formation. Knockdown of fat1 in zebrafish causes pronephric cysts, which is partially rescued by RAC1/CDC42 activators, confirming a role of the two small GTPases in the pathogenesis. These findings provide new insights into the pathogenesis of SRNS and tubulopathy, linking FAT1 and RAC1/CDC42 to podocyte and tubular cell function.

Original languageEnglish
Article number10822
JournalNature communications
Volume7
DOIs
Publication statusPublished - 2016 Feb 24

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Gee, H. Y., Sadowski, C. E., Aggarwal, P. K., Porath, J. D., Yakulov, T. A., Schueler, M., Lovric, S., Ashraf, S., Braun, D. A., Halbritter, J., Fang, H., Airik, R., Vega-Warner, V., Jee Cho, K., Chan, T. A., Morris, L. G. T., Ffrench-Constant, C., Allen, N., McNeill, H., ... Hildebrandt, F. (2016). FAT1 mutations cause a glomerulotubular nephropathy. Nature communications, 7, [10822]. https://doi.org/10.1038/ncomms10822