Table 5Conserved portions of hypothetical minimal gene sets for different lifestyles

Organism’s lifestylea (number of shared proteins/COGs)
Functional class of proteinsFree-living organismsAutotrophsChemoautotrophsThermophiles
Translation, ribosome structure and biogenesis57646862
Transcription49116
Replication recombination, repair9141814
Metabolism6215217189
Cellular processes: chaperone functions, secretion, cell division, cell wall biogenesis17485030
Miscellaneous13467444
Total158320379237
a

The following species whose genomes have been completely sequenced were included in this analysis: Free-living organisms—A. fulgidus, M. jannaschii, M. thermoautotrophicum, P. horikoshii, S. cerevisiae, A. aeolicus, T. maritima, Synechocystis sp., E. coli, B. subtilis; autotrophs—A. fulgidus, M. jannaschii, M. thermoautotrophicum, A. aeolicus, Synechocystis sp.; chemoautotrophs—A. fulgidus, M. jannaschii, M. thermoautotrophicum, A. aeolicus; thermophiles—A. fulgidus, M. jannaschii, M. thermoautotrophicum, D. horikoshii, A. aeolicus, and T. maritima.

From: How Many Genes Can Make a Cell: The Minimal-Gene-Set Concept

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