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Table 2 The genomic island of the UWE25 endosymbiont presents seven different modules. The limit of each module was determined by residual cumulative G+C content analysis.

From: A genomic island present along the bacterial chromosome of the Parachlamydiaceae UWE25, an obligate amoebal endosymbiont, encodes a potentially functional F-like conjugative DNA transfer system

Modules 1st mod. 2nd mod. 3rd mod. 4th mod. 5th mod. 6th mod. 7th mod.
Length 32 kb 16 kb 19 kb 10 kb 6 kb 12 kb 2 kb
Mean G+C content (%) 36.4%a 34.1% 40.9% 33.4% 41.8% 33.3% 38.7%
Number of ORFs 28 18 21 13 1 13 6
Number of genes having an homolog 16 (57%) 5 (28%) 16 (85%) 7 (54%) 1 (100%) 5 (38%) 5 (83%)
Number of genes having no homolog 12 13 5 6 0 8 1
Best hits with homologs in:        
- chlamydiae 12 0 0 0 0 0 0
- cyanobacteria 2 2 0 3 0 2 0
- plantsb 0 0 0 0 0 0 0
- α-proteobacteria 0 0 6 0 0 0 0
- β-proteobacteria 1 0 3 1 0 0 0
- γ-proteobacteria 0 1 6 2 0 0 4c
- Bacteroidetes group 0 0 1 0 0 2 1
- others 1 2 0 1 1 1 0
Homologousd to:        
- phage-related protein 0 3 0 1 0 1 2
- putative transposase 1 1 2 0 0 2e 2
- resolvase 0 0 0 0 0 0 1
- protein involved in DNA metabolism 0 1 0 2 0 2 0
  1. a the G+C content is similar to that of 36.1% of the remaining genome (calculated on 1931 ORFs);
  2. b 5% of the 2031 ORFs of the genome of UWE25 have products homologous to plant proteins, but no ORFs of the GI were homologous to plant counterparts;
  3. c two ORFs which presented best homologs encoded by a plasmid of an uncultured bacteria present in activated sludge have a second best BLAST hit encoded by a gamma-proteobacterial ORFs (Pseudomonas sp.);
  4. d not only the best BLAST hit is taking into consideration to determine the putative function encoded by the ORF;
  5. e one of them has an e-value above 0.001.