Three-domain system

A phylogenetic tree based on rRNA data, emphasizing the separation of bacteria, archaea, and eukarya as proposed by Carl Woese et al. in 1990,[1] with the hypothetical last universal common ancestor

The three-domain system is a taxonomic classification system that groups all cellular life into three domains, namely Archaea, Bacteria and Eukarya, introduced by Carl Woese, Otto Kandler and Mark Wheelis in 1990.[1] The key difference from earlier classifications such as the two-empire system and the five-kingdom classification is the splitting of Archaea (previously named "archaebacteria") from Bacteria as completely different organisms.

The three domain Hypothesis is since contested as it is argued that eukaryotes do not form a separate domain of life, but are comprised within the Archea domain, and originated through symbiogenesis between two lineages; one from within Archaea and one from within Bacteria.[2][3][4]

  1. ^ a b Woese CR, Kandler O, Wheelis ML (June 1990). "Towards a natural system of organisms: proposal for the domains Archaea, Bacteria, and Eucarya". Proceedings of the National Academy of Sciences of the United States of America. 87 (12): 4576–9. Bibcode:1990PNAS...87.4576W. doi:10.1073/pnas.87.12.4576. PMC 54159. PMID 2112744.
  2. ^ Cite error: The named reference Gabaldón was invoked but never defined (see the help page).
  3. ^ Nobs, Stephanie-Jane; MacLeod, Fraser I.; Wong, Hon Lun; Burns, Brendan P. (2022). "Eukarya the chimera: eukaryotes, a secondary innovation of the two domains of life?". Trends in Microbiology. 30 (5): 421–431. doi:10.1016/j.tim.2021.11.003. PMID 34863611. S2CID 244823103.
  4. ^ Doolittle, W. Ford (2020). "Evolution: Two Domains of Life or Three?". Current Biology. 30 (4): R177 – R179. Bibcode:2020CBio...30.R177D. doi:10.1016/j.cub.2020.01.010. PMID 32097647.

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