Abstract

No efficient treatment exists for nephrotic syndrome (NS), a frequent cause of chronic kidney disease. Here we show mutations in six different genes (MAGI2, TNS2, DLC1, CDK20, ITSN1, ITSN2) as causing NS in 17 families with partially treatment-sensitive NS (pTSNS). These proteins interact and we delineate their roles in Rho-like small GTPase (RLSG) activity, and demonstrate deficiency for mutants of pTSNS patients. We find that CDK20 regulates DLC1. Knockdown of MAGI2, DLC1, or CDK20 in cultured podocytes reduces migration rate. Treatment with dexamethasone abolishes RhoA activation by knockdown of DLC1 or CDK20 indicating that steroid treatment in patients with pTSNS and mutations in these genes is mediated by this RLSG module. Furthermore, we discover ITSN1 and ITSN2 as podocytic guanine nucleotide exchange factors for Cdc42. We generate Itsn2-L knockout mice that recapitulate the mild NS phenotype. We, thus, define a functional network of RhoA regulation, thereby revealing potential therapeutic targets.

Details

Title
Mutations in six nephrosis genes delineate a pathogenic pathway amenable to treatment
Author
Ashraf, Shazia 1 ; Kudo, Hiroki 2 ; Rao, Jia 3 ; Kikuchi, Atsuo 2   VIAFID ORCID Logo  ; Widmeier, Eugen 3 ; Lawson, Jennifer A 3 ; Tan, Weizhen 3 ; Hermle, Tobias 3 ; Warejko, Jillian K 3 ; Shril, Shirlee 3 ; Airik, Merlin 3 ; Jobst-Schwan, Tilman 3 ; Lovric, Svjetlana 3 ; Braun, Daniela A 3 ; Gee, Heon Yung 4   VIAFID ORCID Logo  ; Schapiro, David 3 ; Majmundar, Amar J 3 ; Sadowski, Carolin E 3 ; Pabst, Werner L 3 ; Daga, Ankana 3 ; Amelie T van der Ven 3 ; Schmidt, Johanna M 3 ; Low, Boon Chuan 5 ; Anjali Bansal Gupta 6 ; Tripathi, Brajendra K 7 ; Wong, Jenny 8 ; Campbell, Kirk 8 ; Metcalfe, Kay 9 ; Schanze, Denny 10   VIAFID ORCID Logo  ; Niihori, Tetsuya 11 ; Kaito, Hiroshi 12 ; Nozu, Kandai 12 ; Tsukaguchi, Hiroyasu 13 ; Tanaka, Ryojiro 14   VIAFID ORCID Logo  ; Hamahira, Kiyoshi 15 ; Kobayashi, Yasuko 16 ; Takizawa, Takumi 17 ; Funayama, Ryo 18 ; Nakayama, Keiko 18 ; Aoki, Yoko 11 ; Kumagai, Naonori 2 ; Iijima, Kazumoto 12 ; Fehrenbach, Henry 19 ; Kari, Jameela A 20 ; Sherif El Desoky 20 ; Jalalah, Sawsan 21 ; Bogdanovic, Radovan 22 ; Stajić, Nataša 22 ; Zappel, Hildegard 23 ; Assel Rakhmetova 24 ; Sharon-Rose Wassmer 25 ; Jungraithmayr, Therese 26 ; Strehlau, Juergen 27 ; Aravind Selvin Kumar 28 ; Bagga, Arvind 29 ; Soliman, Neveen A 30 ; Mane, Shrikant M 31 ; Kaufman, Lewis 8 ; Lowy, Douglas R 7 ; Jairajpuri, Mohamad A 32 ; Lifton, Richard P 33 ; York, Pei 34 ; Zenker, Martin 10 ; Kure, Shigeo 2 ; Hildebrandt, Friedhelm 3   VIAFID ORCID Logo 

 Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA; Department of Biosciences, Jamia Millia Islamia, New Delhi, India 
 Department of Pediatrics, Tohoku University School of Medicine, Sendai, Miyagi, Japan 
 Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA 
 Department of Medicine, Boston Children’s Hospital, Harvard Medical School, Boston, MA, USA; Department of Pharmacology, Brain Korea 21 PLUS Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Korea 
 Department of Biological Sciences, National University of Singapore, Singapore, Singapore; Mechanobiology Institute, National University of Singapore, Singapore, Singapore 
 Mechanobiology Institute, National University of Singapore, Singapore, Singapore 
 Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA 
 Division of Nephrology, Icahn School of Medicine at Mount Sinai, New York, NY, USA 
 Manchester Centre for Genomic Medicine, St Mary’s Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK 
10  Institute of Human Genetics, University Hospital Magdeburg, Magdeburg, Germany 
11  Department of Medical Genetics, Tohoku University School of Medicine, Sendai, Miyagi, Japan 
12  Department of Pediatrics, Kobe University Graduate School of Medicine, Kobe, Japan 
13  2nd Department of Internal Medicine, Kansai Medical University, Osaka, Japan 
14  Department of Nephrology, Hyogo Prefectural Kobe Children’s Hospital, Kobe, Hyogo, Japan 
15  Department of Pediatrics, Himeji Red Cross Hospital, Himeji, Hyogo, Japan 
16  Department of Pediatrics, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan; Academic Renal Unit, School of Clinical Science, University of Bristol, Bristol, United Kingdom 
17  Department of Pediatrics, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan 
18  Division of Cell Proliferation, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan 
19  Department of Pediatric Nephrology, Children’s Hospital, Memmingen, Germany 
20  Pediatric Nephrology Center of Excellence and Pediatric Department, King Abdulaziz University, Jeddah, Saudi Arabia 
21  Pathology Department, King Abdulaziz University, Jeddah, Saudi Arabia 
22  Institute for Mother and Child Health Care of Serbia “Dr Vukan Čupić”, Department of Nephrology, University of Belgrade, Faculty of Medicine, Belgrade, Serbia 
23  Department for Paediatrics II, University of Göttingen, Göttingen, Germany 
24  Department of Nephrology, Asfendiyarov Kazakh National Medical University, Almaty, Kazakhstan 
25  Department of Nephrology, Luzerner Kantonsspital, Lucerne, Switzerland 
26  Department of Pediatrics, University Medical Center Innsbruck, Innsbruck, Austria 
27  Department of Pediatric Nephrology, Hannover Medical School, Hannover, Germany 
28  Department of Pediatric Nephrology and Medical Genetics, Institute of Child Health and Hospital for Children, TN Dr.M.G.R. Medical University, Chennai, India 
29  Division of Pediatric Nephrology, Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India 
30  Department of Pediatrics, Center of Pediatric Nephrology & Transplantation, Kasr Al Ainy School of Medicine, Cairo University, Cairo, Egypt 
31  Department of Genetics, Yale University School of Medicine, New Haven, CT, USA 
32  Department of Biosciences, Jamia Millia Islamia, New Delhi, India 
33  Department of Genetics, Yale University School of Medicine, New Haven, CT, USA; Laboratory of Human Genetics and Genomics, The Rockefeller University, New York, NY, USA 
34  Division of Nephrology, University Health Network, and University of Toronto, Toronto, ON, Canada 
Pages
1-14
Publication year
2018
Publication date
May 2018
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2040742607
Copyright
© 2018. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.