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Mutations in MAPKBP1 cause late onset cilia-independent nephronophthisis

Macia, Maxence and Halbritter, Jan and Delous, Marion and Bredrup, Cecilie and Gutter, Arthur and Filhol, Emilie and Christensen Mellgren, Anne Elisabeth and Leh, Sabine and Braun, Daniela A and Gee, Heon Y and Legendre, Flora and Krug, Pauline and Bole-Feysot, Christine and Nitschke, Patrick and Joly, Dominique and Nicoud, Philippe and Paget, Andre and Haugland, Heidi and Brackmann, Damien and Ahmet, Nayir and Sandford, Richard and Cengiz, Nurcan and Knappskog, Per Morten and Boman, Helge and Linghu, Bolan and Yang, Fan and Oakeley, Edward James and Saint-Mezard, Pierre and Sailer, Andreas and Johansson, Stefan and Rodahl, Eyvind and Saunier, Sophie and Hildebrandt, Friedhelm and Benmerah, Alexandre (2017) Mutations in MAPKBP1 cause late onset cilia-independent nephronophthisis. American Journal of Human Genetics.

Abstract

Nephronophthisis (NPH), an autosomal recessive tubulointerstitial nephritis, is the most common cause of heriditary end-stage renal disease in the first three decades of life. Since most NPH gene products (NPHP) function at the primary cilium, NPH is classified as ciliopathy. We identified mutations in a novel candidate gene in 10 individuals from 6 families presenting late onset NPH with massive renal fibrosis. This gene encodes MAPKBP1, a poorly characterized scaffolding protein for JNK signaling. Immunofluorescence analyses showed that MAPKBP1 is not present at the primary cilium and that fibroblasts from affected individuals did not display ciliogenesis defects indicating that MAPKBP1 may represent a new family of NPHP not involved in cilia-associated functions. Instead, MAPKBP1 is recruited to mitotic spindle poles (MSPs) during the early phases of mitosis where it colocalizes with its paralog WDR62, which plays a key role at MSP. Detected mutations compromise recruitment of MAPKBP1 to the MSP and/or its interaction with JNK2 or WDR62. Additionally, we show increased DNA damage response signaling in patients fibroblasts and upon knockdown of Mapkbp1 in murine cell lines, a phenotype previously associated with NPH. In conclusion, we identified mutations in MAPKBP1 as a genetic cause of late onset and cilia-independent NPH and propose “NPHP21” as an alias for MAPKBP1.

Item Type: Article
Keywords: Nephronophthisis, MAPKBP1
Date Deposited: 01 Feb 2017 00:45
Last Modified: 01 Feb 2017 00:45
URI: https://oak.novartis.com/id/eprint/29225

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