Extrachromosomal DNA-Driven Oncogene Spatial Heterogeneity and Evolution in Glioblastoma.
Imran Noorani1,2,3, Magnus Haughey4, Jens Luebeck5
1Cancer Evolution and Genome Instability Laboratory, The Francis Crick Institute, London, United Kingdom.
Cancer Discovery
|September 8, 2025
Summary
Extrachromosomal DNA (ecDNA) oncogene amplification drives cancer resistance. This study reveals oncogene-specific ecDNA evolution in glioblastoma, showing EGFR-ecDNA accumulation precedes clonal expansion, impacting treatment resistance.
Area of Science:
- Genomics
- Cancer Biology
- Computational Biology
Background:
- Extrachromosomal DNA (ecDNA) amplification of oncogenes is a hallmark of cancer, linked to treatment resistance and poor prognosis.
- The spatiotemporal evolution and heterogeneity of ecDNA remain poorly understood, hindering therapeutic strategies.
Purpose of the Study:
- To investigate the spatiotemporal evolution of ecDNA in human glioblastoma (GBM).
- To understand oncogene-specific patterns of ecDNA heterogeneity and their evolutionary trajectories.
Main Methods:
- Integration of computational modeling with genomic data from 94 treatment-naive human GBM samples.
- Analysis of spatial patterns and evolutionary properties of ecDNA-amplified oncogenes.
Main Results:
- Observed oncogene-specific spatial heterogeneity in ecDNA, driven by random segregation and differential fitness advantages.
- EGFR-ecDNAs, unlike PDGFRA-ecDNAs, accumulate before clonal expansions, conferring significant fitness advantages and high abundance.
- Variant EGFR-ecDNAs, including EGFRvIII, originate from wild-type EGFR-ecDNAs, appearing early and reaching high levels.
Conclusions:
- The oncogenic makeup of ecDNA dictates distinct evolutionary paths in GBM.
- New concepts like ecDNA clonality and heteroplasmy necessitate refined evolutionary interpretations of GBM genomic data.
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