Analysis of the Pantoea ananatis pan-genome reveals factors underlying its ability to colonize and interact with plant, insect and vertebrate hosts

Table 2 Pan-genome statistics derived from analyses of several bacterial taxa displaying ‘open’ pan-genomes

Species	# strains	Mean # genome CDSs	Mean # core CDSs	% core CDSs/genome	Pan-genome (# CDS) compared strains	Estimated core genome (# CDS)	Unique CDSs per additional strain	Ref
Streptococcus pneumoniae ^*	44	-	-	-	3,221	1,666^a	1^a	[24]
Streptococcus agalactiae	8	2,029	2,245	90.4%	>2,700	1,806	33	[12]
Haemophilus influenzae ^*	13	1,793	1,461	81.5%	2,786	1,461	40	[25]
Erwinia amylovora	12	3,819	3,414	89.4%	5,751	-	52	[21]
Pantoea ananatis	8	4,342	4,033	92.9%	5,566	3,876	106	-
Escherichia coli	17	5,020	2,344	46.7%	>13,000	2,200	300	[22]
Bacillus thuringiensis	7	6,847	-	> 81%	>12,000	4,196	558	[26]

The number of strains included in the comparison are indicated, as are the mean number of CDSs per compared genome, those CDSs which are core to all compared strains, the relative proportion of core CDSs per genome (%) and the pan-genome sizes (#CDSs) for the compared strains, where the data is available. The estimated core genomes and unique CDSs added to the pan-genome when additional sequenced strains would be added to the comparison are shown. ^*denotes those pan-genome analyses where the orthologous CDSs in a compared genome were first grouped ito orthologous clusters. ^aindicates the number of unique genes that are predicted to be added to the S. pneumoniae pan-genome if 100 genomes would be compared.

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