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Oud MM, Bonnard C, Mans DA, Altunoglu U, Tohari S, Ng AYJ, Eskin A, Lee H, Rupar CA, de Wagenaar NP, Wu KM, Lahiry P, Pazour GJ, Nelson SF, Hegele RA, Roepman R, Kayserili H, Venkatesh B, Siu VM, Reversade B, Arts HH. A novel ICK mutation causes ciliary disruption and lethal endocrine-cerebro-osteodysplasia syndrome. Cilia 2016; 5:8. [PMID: 27069622 PMCID: PMC4827216 DOI: 10.1186/s13630-016-0029-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 01/27/2016] [Indexed: 11/17/2022] Open
Abstract
Background Endocrine-cerebro-osteodysplasia (ECO) syndrome [MIM:612651] caused by a recessive mutation (p.R272Q) in Intestinal cell kinase (ICK) shows significant clinical overlap with ciliary disorders. Similarities are strongest between ECO syndrome, the Majewski and Mohr-Majewski short-rib thoracic dysplasia (SRTD) with polydactyly syndromes, and hydrolethalus syndrome. In this study, we present a novel homozygous ICK mutation in a fetus with ECO syndrome and compare the effect of this mutation with the previously reported ICK variant on ciliogenesis and cilium morphology. Results Through homozygosity mapping and whole-exome sequencing, we identified a second variant (c.358G > T; p.G120C) in ICK in a Turkish fetus presenting with ECO syndrome. In vitro studies of wild-type and mutant mRFP-ICK (p.G120C and p.R272Q) revealed that, in contrast to the wild-type protein that localizes along the ciliary axoneme and/or is present in the ciliary base, mutant proteins rather enrich in the ciliary tip. In addition, immunocytochemistry revealed a decreased number of cilia in ICK p.R272Q-affected cells. Conclusions Through identification of a novel ICK mutation, we confirm that disruption of ICK causes ECO syndrome, which clinically overlaps with the spectrum of ciliopathies. Expression of ICK-mutated proteins result in an abnormal ciliary localization compared to wild-type protein. Primary fibroblasts derived from an individual with ECO syndrome display ciliogenesis defects. In aggregate, our findings are consistent with recent reports that show that ICK regulates ciliary biology in vitro and in mice, confirming that ECO syndrome is a severe ciliopathy. Electronic supplementary material The online version of this article (doi:10.1186/s13630-016-0029-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Machteld M Oud
- Department of Human Genetics (855), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO-Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Carine Bonnard
- Laboratory of Human Embryology & Genetics, Institute of Medical Biology, ASTAR, Singapore, Singapore
| | - Dorus A Mans
- Department of Human Genetics (855), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO-Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Umut Altunoglu
- Medical Genetics Department, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - Sumanty Tohari
- Institute of Molecular and Cell Biology, ASTAR, Singapore, Singapore
| | - Alvin Yu Jin Ng
- Institute of Molecular and Cell Biology, ASTAR, Singapore, Singapore
| | - Ascia Eskin
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Hane Lee
- Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - C Anthony Rupar
- Department of Biochemistry, University of Western Ontario, Room 4212A, 1151 Richmond Street N, N6A 5B7 London, ON Canada.,Medical Genetics Program, London Health Sciences Centre, London, ON Canada.,Children's Health Research Institute, London, ON Canada
| | - Nathalie P de Wagenaar
- Department of Human Genetics (855), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO-Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Ka Man Wu
- Department of Human Genetics (855), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO-Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Piya Lahiry
- Department of Paediatrics, The Hospital for Sick Children, Toronto, ON Canada
| | - Gregory J Pazour
- Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, MA USA
| | - Stanley F Nelson
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, USA.,Department of Pathology and Laboratory Medicine, David Geffen School of Medicine, University of California, Los Angeles, USA
| | - Robert A Hegele
- Department of Biochemistry, University of Western Ontario, Room 4212A, 1151 Richmond Street N, N6A 5B7 London, ON Canada.,Robarts Research Institute, London, ON Canada
| | - Ronald Roepman
- Department of Human Genetics (855), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO-Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Hülya Kayserili
- Medical Genetics Department, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey.,Medical Genetics Department, Koç University School of Medicine, Istanbul, Turkey
| | - Byrappa Venkatesh
- Institute of Molecular and Cell Biology, ASTAR, Singapore, Singapore
| | - Victoria M Siu
- Department of Biochemistry, University of Western Ontario, Room 4212A, 1151 Richmond Street N, N6A 5B7 London, ON Canada.,Medical Genetics Program, London Health Sciences Centre, London, ON Canada.,Children's Health Research Institute, London, ON Canada
| | - Bruno Reversade
- Laboratory of Human Embryology & Genetics, Institute of Medical Biology, ASTAR, Singapore, Singapore
| | - Heleen H Arts
- Department of Human Genetics (855), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, PO-Box 9101, 6500 HB Nijmegen, The Netherlands.,Department of Biochemistry, University of Western Ontario, Room 4212A, 1151 Richmond Street N, N6A 5B7 London, ON Canada.,Children's Health Research Institute, London, ON Canada.,Robarts Research Institute, London, ON Canada
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