The analysis identified a continuum of stemness-related expression states across individual glioblastoma cells, rather than discrete stemness categories. This continuous spectrum of stemness expression enabled identification of putative regulators of stemness in vivo, suggesting that cancer stem cell properties exist on a gradient within tumors. [@patel_single-cell_2014]
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Glioblastoma cells display a spectrum of stemness-related expression states rather than discrete cancer stem cell and non-stem cell populations, challenging the traditional hierarchical model of tumor organization. This continuum reflects varying degrees of stem cell properties including self-renewal capacity and multipotency across individual tumor cells, suggesting that stemness exists as a plastic, dynamic quality rather than a fixed cellular identity. The mechanistic regulators that govern transitions along this continuum remain incompletely characterized, with only putative regulators identified rather than validated drivers of state changes. What remains contested is whether these expression states represent stable cellular subpopulations with distinct functions or transient states that cells can readily transition between in response to microenvironmental signals or intrinsic genomic instability.
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