Reverting to single-cell biology: The predictions of the atavism theory of cancer
- PMID: 34371024
- PMCID: PMC8833046
- DOI: 10.1016/j.pbiomolbio.2021.08.002
Reverting to single-cell biology: The predictions of the atavism theory of cancer
Abstract
Cancer or cancer-like phenomena pervade multicellular life, implying deep evolutionary roots. Many of the hallmarks of cancer recapitulate unicellular modalities, suggesting that cancer initiation and progression represent a systematic reversion to simpler ancestral phenotypes in response to a stress or insult. This so-called atavism theory may be tested using phylostratigraphy, which can be used to assign ages to genes. Several research groups have confirmed that cancer cells tend to over-express evolutionary older genes, and rewire the architecture linking unicellular and multicellular gene networks. In addition, some of the elevated mutation rate - a well-known hallmark of cancer - is actually self-inflicted, driven by genes found to be homologs of the ancient SOS genes activated in stressed bacteria, and employed to evolve biological workarounds. These findings have obvious implications for therapy.
Keywords: Atavism; Bacteria; Evolutionary ages; Phylostratigraphy; SOS response; Unicellularity.
Copyright © 2021. Published by Elsevier Ltd.
Conflict of interest statement
Declaration of competing interest The authors declare that they have no competing financial interests or personal relationships that could be perceived to have influenced the work reported in this paper.
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