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Table 1 Fraction of singletons (Q) for various subsets of protein-encoding E. coli genes

From: Complexity, connectivity, and duplicability as barriers to lateral gene transfer

Source Protein subset Number of proteins Number of singletons Q
SwissProt Monomers 137 87 0.6350
  Homo-oligomers + monomers 596 333 0.5587
  Hetero-oligomers 407 228 0.5602
  Mid-to-large complexes (homotrimer and above) 334 197 0.5898
  1 external interaction 641 342 0.5335
  >1 external interaction 125 75 0.5000
Arifuzzaman et al. 2006 [9] 1 external interaction 371 193 0.5202
  >1 external interaction 1,916 1,049 0.5475
Ragan 2001 [11] LGT due to atypical nucleotide composition 568 339 0.5968
Beiko et al. 2005 [13] LGT by Bayesian phylogenetic analysis 987 607 0.6150
PEC database Essential genes 233 173 0.7425
  E. coli average 4,308 2,382 0.5529