Abstract
Human malignant gliomas exhibit acquisition of either one of two telomere maintenance mechanisms, resulting from either reactivation of telomerase expression or activation of an alternative lengthening of telomeres (ALT) mechanism. In the present study, we analyzed 63 human malignant gliomas for the presence of ALT-specific extrachromosomal circles of telomeric DNA (C-circles) and measured telomerase expression, telomeric DNA content (Telo/Alu method), and telomeric repeat-containing RNAs (TERRA) levels. We also assessed histomolecular markers routinely used in clinical practice. The presence of C-circles significantly correlated with IDH1/2 mutation, MGMT exon 1 methylation, low Ki-67 immunostaining, increased telomeric DNA content, absence of functional ATRX protein and level of HTERT gene expression. In multivariate analysis, we observed a trend to a correlation between elevated TERRA levels and increased survival. Interestingly, the C-circles assay allowed to detect ALT activation in glioblastomas exhibiting wild-type IDH1/2 and ATRX expression. These results suggest that, after the correlations uncovered here have been confirmed on larger numbers of tumors, telomeric markers might be useful in improving diagnosis. They also point out to the utility of using the specific, sensitive and quantitative C-circle and Telo/Alu assays that can work with as few as 30 ng of tumor DNA.
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Acknowledgements
We thank Mélanie Müller-Barthélémy and Annette Quinsat for technical assistance, Valérie Gouilleux for the gift of cell lines, as well as the “Département Génomique PPF ASB” facility at University François-Rabelais of Tours for access to the Storm phosphorimager. This work was supported by grants from the “Fondation de France” and from the “Ligue Grand-Ouest contre le Cancer, comités Eure-et-Loir, Ille-et-Vilaine, Indre-et-Loire, Morbihan, Vendée, Vienne” (MC lab) as well as from The French National Research Agency (ANR: project BIVANDEV), the “Ligue contre le Cancer, comités du Puy-de-Dôme et Ardèche”, the “Fondation ARC”, and the “Conseil régional d’Auvergne” (PA lab), and the Plan Cancer-INSERM (CS14085CS “Gliobiv”) (PV and PA labs).
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Michel Charbonneau and Pierre Verrelle are co-senior authors.
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Fogli, A., Demattei, MV., Corset, L. et al. Detection of the alternative lengthening of telomeres pathway in malignant gliomas for improved molecular diagnosis. J Neurooncol 135, 381–390 (2017). https://doi.org/10.1007/s11060-017-2585-7
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DOI: https://doi.org/10.1007/s11060-017-2585-7