Darwinian threshold or Darwinian transition is a term introduced by Carl Woese to describe a transition period during the evolution of the first cells when genetic transmission moves from a predominantly horizontal mode to a vertical mode.[1][2] The process starts when the ancestors of the Last Universal Common Ancestor (the LUCA) become refractory to horizontal (or lateral) gene transfer (HGT) and become individual entities with vertical heredity upon which natural selection is effective. After this transition, life is characterized by genealogies that have a modern tree-like phylogeny.[3]
Darwinian threshold: the transition period during the evolution of the first cells when genetic transmission moves from a predominantly horizontal mode to a vertical mode
^Woese, C. (1998-06-09). "The universal ancestor". Proceedings of the National Academy of Sciences of the United States of America. 95 (12): 6854–6859. Bibcode:1998PNAS...95.6854W. doi:10.1073/pnas.95.12.6854. ISSN 0027-8424. PMC 22660. PMID 9618502.
^Woese, Carl R. (2002-06-25). "On the evolution of cells". Proceedings of the National Academy of Sciences of the United States of America. 99 (13): 8742–8747. Bibcode:2002PNAS...99.8742W. doi:10.1073/pnas.132266999. ISSN 0027-8424. PMC 124369. PMID 12077305.
^Arnoldt, Hinrich; Strogatz, Steven H.; Timme, Marc (2015-11-13). "Toward the Darwinian transition: Switching between distributed and speciated states in a simple model of early life". Physical Review E. 92 (5): 052909. arXiv:1501.05073. Bibcode:2015PhRvE..92e2909A. doi:10.1103/PhysRevE.92.052909. PMID 26651764. S2CID 204906567.
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