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Published in: Molecular Cancer 1/2008

Open Access 01-12-2008 | Research

Anaplastic oligodendrogliomas with 1p19q codeletion have a proneural gene expression profile

Authors: François Ducray, Ahmed Idbaih, Aurélien de Reyniès, Ivan Bièche, Joëlle Thillet, Karima Mokhtari, Séverine Lair, Yannick Marie, Sophie Paris, Michel Vidaud, Khê Hoang-Xuan, Olivier Delattre, Jean-Yves Delattre, Marc Sanson

Published in: Molecular Cancer | Issue 1/2008

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Abstract

Background

In high grade gliomas, 1p19q codeletion and EGFR amplification are mutually exclusive and predictive of dramatically different outcomes. We performed a microarray gene expression study of four high grade gliomas with 1p19q codeletion and nine with EGFR amplification, identified by CGH-array.

Results

The two groups of gliomas exhibited very different gene expression profiles and were consistently distinguished by unsupervised clustering analysis. One of the most striking differences was the expression of normal brain genes by oligodendrogliomas with 1p19q codeletion. These gliomas harbored a gene expression profile that partially resembled the gene expression of normal brain samples, whereas gliomas with EGFR amplification expressed many genes in common with glioblastoma cancer stem cells. The differences between the two types of gliomas and the expression of neuronal genes in gliomas with 1p19q codeletion were both validated in an independent series of 16 gliomas using real-time RT-PCR with a set of 22 genes differentiating the two groups of gliomas (AKR1C3, ATOH8, BMP2, C20orf42, CCNB1, CDK2, CHI3L1, CTTNBP2, DCX, EGFR, GALNT13, GBP1, IGFBP2, IQGAP1, L1CAM, NCAM1, NOG, OLIG2, PDPN, PLAT, POSTN, RNF135). Immunohistochemical study of the most differentially expressed neuronal gene, alpha-internexin, clearly differentiated the two groups of gliomas, with 1p19q codeletion gliomas showing specific staining in tumor cells.

Conclusion

These findings provide evidence for neuronal differentiation in oligodendrogliomas with 1p19q codeletion and support the hypothesis that the cell of origin for gliomas with 1p19q codeletion could be a bi-potential progenitor cell, able to give rise to both neurons and oligodendrocytes.
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Metadata
Title
Anaplastic oligodendrogliomas with 1p19q codeletion have a proneural gene expression profile
Authors
François Ducray
Ahmed Idbaih
Aurélien de Reyniès
Ivan Bièche
Joëlle Thillet
Karima Mokhtari
Séverine Lair
Yannick Marie
Sophie Paris
Michel Vidaud
Khê Hoang-Xuan
Olivier Delattre
Jean-Yves Delattre
Marc Sanson
Publication date
01-12-2008
Publisher
BioMed Central
Published in
Molecular Cancer / Issue 1/2008
Electronic ISSN: 1476-4598
DOI
https://doi.org/10.1186/1476-4598-7-41

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