Integrated multi-omics analysis of oligodendroglial tumours identifies three subgroups of 1p/19q co-deleted gliomas

Nat Commun. 2016 Apr 19;7:11263. doi: 10.1038/ncomms11263.

Abstract

Oligodendroglial tumours (OT) are a heterogeneous group of gliomas. Three molecular subgroups are currently distinguished on the basis of the IDH mutation and 1p/19q co-deletion. Here we present an integrated analysis of the transcriptome, genome and methylome of 156 OT. Not only does our multi-omics classification match the current classification but also reveals three subgroups within 1p/19q co-deleted tumours, associated with specific expression patterns of nervous system cell types: oligodendrocyte, oligodendrocyte precursor cell (OPC) and neuronal lineage. We confirm the validity of these three subgroups using public datasets. Importantly, the OPC-like group is associated with more aggressive clinical and molecular patterns, including MYC activation. We show that the MYC activation occurs through various alterations, including MYC genomic gain, MAX genomic loss, MYC hypomethylation and microRNA-34b/c down-regulation. In the lower grade glioma TCGA dataset, the OPC-like group is associated with a poorer outcome independently of histological grade. Our study reveals previously unrecognized heterogeneity among 1p/19q co-deleted tumours.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Chromosome Deletion*
  • Chromosomes, Human, Pair 1 / genetics*
  • Chromosomes, Human, Pair 19 / genetics*
  • Cluster Analysis
  • DNA Methylation*
  • Female
  • Gene Expression Profiling / methods
  • Genomics*
  • Glioma / genetics
  • Humans
  • Male
  • Middle Aged
  • Neurons / metabolism
  • Oligodendroglia / metabolism
  • Oligodendroglioma / genetics*
  • Proto-Oncogene Proteins c-myc / genetics
  • Signal Transduction / genetics
  • Stem Cells / metabolism
  • Survival Analysis
  • Transcriptome*
  • Young Adult

Substances

  • MYC protein, human
  • Proto-Oncogene Proteins c-myc