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Updated: May 27, 2026
Mosaic Zebrafish Transgenesis for Functional Genomic Analysis of Candidate Cooperative Genes in Tumor Pathogenesis
Published on: March 31, 2015
Mosaic amplification of multiple receptor tyrosine kinase genes in glioblastoma
Matija Snuderl1, Ladan Fazlollahi, Long P Le
1Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA.
Abstract:
Tumor heterogeneity has been implicated in tumor growth and progression as well as resistance to therapy. We present an example of genetic heterogeneity in human malignant brain tumors in which multiple closely related driver genes are amplified and activated simultaneously in adjacent intermingled cells. We have observed up to three different receptor tyrosine kinases (EGFR, MET, PDGFRA) amplified in single tumors in different cells in a mutually exclusive fashion. Each subpopulation was actively dividing, and the genetic changes resulted in protein production, and coexisting subpopulations shared common early genetic mutations indicating their derivation from a single precursor cell. The stable coexistence of different clones within the same tumor will have important clinical implications for tumor resistance to targeted therapies.
Insights
Genetic heterogeneity in brain tumors involves multiple driver genes amplified in adjacent cells. This finding impacts targeted therapy resistance due to coexisting tumor cell subpopulations.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Tumor heterogeneity contributes to cancer progression and therapy resistance.
- Understanding genetic diversity within tumors is crucial for effective treatment strategies.
Purpose of the Study:
- To investigate genetic heterogeneity in human malignant brain tumors.
- To identify coexisting, distinct cell subpopulations with amplified driver genes within single tumors.
Main Methods:
- Analysis of genetic alterations in human malignant brain tumors.
- Detection of amplified receptor tyrosine kinases (EGFR, MET, PDGFRA) in individual cells.
- Assessment of cell division and protein production in subpopulations.
Main Results:
- Observed simultaneous amplification of multiple driver genes (EGFR, MET, PDGFRA) in adjacent, intermingled cells within single tumors.
- Found that amplifications occurred in a mutually exclusive manner across different cell subpopulations.
- Confirmed that each subpopulation was actively dividing, produced proteins, and shared common early mutations, indicating a single precursor cell origin.
Conclusions:
- Malignant brain tumors can exhibit significant genetic heterogeneity with distinct, coexisting clones.
- Simultaneous amplification of multiple receptor tyrosine kinases in different cells suggests complex evolutionary pathways.
- This genetic diversity has critical implications for the development of resistance to targeted therapies.
