Mutations in MAPKBP1 Cause Juvenile or Late-Onset Cilia-Independent Nephronophthisis

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• 作者：Maxence S. Macia¹ ; ² ; Jan Halbritter³ ; ⁴ ; ²² ; Marion Delous¹ ; ² ; ²² ; Cecilie Bredrup⁵ ; ⁶ ; Arthur Gutter¹ ; ² ; Emilie Filhol¹ ; ² ; Anne E.C. Mellgren⁵ ; ⁶ ; ⁷ ; Sabine Leh⁷ ; ⁸ ; Albane Bizet¹ ; ² ; Daniela A. Braun³ ; Heon Y. Gee³ ; Flora Silbermann¹ ; ² ; Charline Henry¹ ; ² ; Pauline Krug¹ ; ² ; ⁹ ; Christine Bole-Feysot² ; ¹⁰ ; Patrick Nitschké ; ² ; ¹¹ ; Dominique Joly¹² ; Philippe Nicoud¹³ ; André ; Paget¹³ ; Heidi Haugland¹⁴ ; Damien Brackmann¹⁵ ; Nayir Ahmet¹⁶ ; Richard Sandford¹⁷ ; Nurcan Cengiz¹⁸ ; Per M. Knappskog⁶ ; ¹⁹ ; Helge Boman⁶ ; Bolan Linghu²⁰ ; Fan Yang²⁰ ; Edward J. Oakeley²¹ ; Pierre Saint Mé ; zard²¹ ; Andreas W. Sailer²¹ ; Stefan Johansson⁶ ; ¹⁹ ; Eyvind Rø ; dahl⁵ ; ⁷ ; ²³ ; Sophie Saunier¹ ; ² ; ²³ ; ^{sophie.saunier@inserm.fr} ; Friedhelm Hildebrandt³ ; ²³ ; ^{friedhelm.hildebrandt@childrens.harvard.edu} ; Alexandre Benmerah¹ ; ² ; ²³
• 关键词：nephronophthisis ; ciliopathy ; kidney ; retinitis pigmentosa ; digenism ; mitotic spindle ; MAP kinase ; DNA damage ; MAPKBP1 ; WDR62
• 刊名：The American Journal of Human Genetics
• 出版年：2017
• 出版时间：2 February 2017
• 年：2017
• 卷：100
• 期：2
• 页码：323-333
• 全文大小：3427 K
• 卷排序：100

文摘

Nephronophthisis (NPH), an autosomal-recessive tubulointerstitial nephritis, is the most common cause of hereditary 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 a ciliopathy. We identified mutations in a candidate gene in eight individuals from five 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 fibroblasts from affected individuals 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 juvenile or late-onset and cilia-independent NPH.