Most human non-GCIMP glioblastoma subtypes evolve from a common proneural-like precursor glioma.
To understand the relationships between the non-GCIMP glioblastoma (GBM) subgroups, we performed mathematical modeling to predict the temporal sequence of driver events during tumorigenesis. The most common order of evolutionary events is 1) chromosome (chr) 7 gain and chr10 loss, followed by 2) CDKN2A loss and/or TP53 mutation, and 3) ... alterations canonical for specific subtypes. We then developed a computational methodology to identify drivers of broad copy number changes, identifying PDGFA (chr7) and PTEN (chr10) as driving initial nondisjunction events. These predictions were validated using mouse modeling, showing that PDGFA is sufficient to induce proneural-like gliomas and that additional NF1 loss converts proneural to the mesenchymal subtype. Our findings suggest that most non-GCIMP mesenchymal GBMs arise as, and evolve from, a proneural-like precursor.
Mesh Terms:
Animals, Brain Neoplasms, Cell Transformation, Neoplastic, Chromosome Duplication, Chromosomes, Human, Pair 10, Chromosomes, Human, Pair 7, CpG Islands, DNA Methylation, Disease Progression, Gene Amplification, Gene Dosage, Glioblastoma, Humans, Mice, Neurofibromin 1, PTEN Phosphohydrolase, Proto-Oncogene Proteins c-sis, Receptor, Epidermal Growth Factor, Receptor, Platelet-Derived Growth Factor alpha
Animals, Brain Neoplasms, Cell Transformation, Neoplastic, Chromosome Duplication, Chromosomes, Human, Pair 10, Chromosomes, Human, Pair 7, CpG Islands, DNA Methylation, Disease Progression, Gene Amplification, Gene Dosage, Glioblastoma, Humans, Mice, Neurofibromin 1, PTEN Phosphohydrolase, Proto-Oncogene Proteins c-sis, Receptor, Epidermal Growth Factor, Receptor, Platelet-Derived Growth Factor alpha
Cancer Cell
Date: Aug. 11, 2014
PubMed ID: 25117714
View in: Pubmed Google Scholar
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