Volume 78, Issue 3 pp. 355-374
Research Article

CIC inactivating mutations identify aggressive subset of 1p19q codeleted gliomas

Vincent Gleize PhD

Vincent Gleize PhD

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

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Agusti Alentorn MD, PhD

Agusti Alentorn MD, PhD

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Neurologie 2, Paris, France

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Léa Connen de Kérillis MSc

Léa Connen de Kérillis MSc

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

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Marianne Labussière PhD

Marianne Labussière PhD

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

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Aravidan A Nadaradjane BSc

Aravidan A Nadaradjane BSc

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

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Emeline Mundwiller MSC

Emeline Mundwiller MSC

Institut du Cerveau et de la Moelle Epinière, Plateforme de Génotypage et Séquençage, Paris, France

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Chris Ottolenghi MD, PhD

Chris Ottolenghi MD, PhD

Biochimie Métabolique, Université Paris Descartes et Inserm U1124, Paris, France

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Stephanie Mangesius MSc

Stephanie Mangesius MSc

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

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Amithys Rahimian MSc

Amithys Rahimian MSc

AP-HP, Onconeurothèque, Paris, France

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François Ducray MD, PhD

François Ducray MD, PhD

Hôpital Neurologique, Service de Neurologie B, Lyon, France

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on behalf of the POLA network

on behalf of the POLA network

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Karima Mokhtari MD

Karima Mokhtari MD

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

AP-HP, Onconeurothèque, Paris, France

AP-HP, Groupe Hospitalier Pitié Salpêtrière, Laboratoire de Neuropathologie R Escourolle, Paris, France

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Chiara Villa MD

Chiara Villa MD

AP-HP, Groupe Hospitalier Pitié Salpêtrière, Laboratoire de Neuropathologie R Escourolle, Paris, France

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Marc Sanson MD, PhD

Corresponding Author

Marc Sanson MD, PhD

Sorbonne Université, UPMC Univ Paris 06, Inserm, CNRS, UM 75, U 1127, UMR 7225, ICM, Paris, France

AP-HP, Groupe Hospitalier Pitié-Salpêtrière, Service de Neurologie 2, Paris, France

AP-HP, Onconeurothèque, Paris, France

Address correspondance to Dr Marc Sanson, Service de Neurologie 2, Groupe Hospitalier Pitié-Salpêtrière, 75651, Paris cedex 13, France. E-mail: [email protected]Search for more papers by this author
First published: 27 May 2015
Citations: 72

Abstract

Objective

CIC gene is frequently mutated in oligodendroglial tumors with 1p19q codeletion. However, clinical and biological impact remain poorly understood.

Methods

We sequenced the CIC gene on 127 oligodendroglial tumors (109 with the 1p19q codeletion) and analyzed patients' outcome. We compared magnetic resonance imaging, transcriptomic profile, and CIC protein expression of CIC wild-type (WT) and mutant gliomas. We compared the level of expression of CIC target genes on Hs683-IDH1R132H cells transfected with lentivirus encoding mutant and WT CIC.

Results

We found 63 mutations affecting 60 of 127 patients, virtually all 1p19q codeleted and IDH mutated (59 of 60). In the 1p19q codeleted gliomas, CIC mutations were associated with a poorer outcome by uni- (p = 0.001) and multivariate analysis (p < 0.016). CIC mutation prognostic impact was validated on the TCGA cohort. CIC mutant grade II codeleted gliomas spontaneously grew faster than WTs. Transcriptomic analysis revealed an enrichment of proliferative pathways and oligodendrocyte precursor cell gene expression profile in CIC mutant gliomas, with upregulation of normally CIC repressed genes ETV1, ETV4, ETV5, and CCND1. Various missense mutations resulted in CIC protein expression loss. Moreover, a truncating CIC mutation resulted in a defect of nuclear targeting of CIC protein to the nucleus in a human glioma cell line expressing IDH1R132H and overexpression of CCND1 and other new target genes of CIC, such as DUSP4 and SPRED1.

Interpretation

CIC mutations result in protein inactivation with upregulation of CIC target genes, activation of proliferative pathways, inhibition of differentiation, and poorer outcome in patients with a 1p19q codeleted glioma. Ann Neurol 2015;78:355–374

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