A quantitative account of genomic island acquisitions in prokaryotes

BMC Genomics

Table 3 Overview of the characteristics of the GI analyses using decreasing similarity thresholds (for all GIs > 10 kb)

	Stringency	Total number of GIs	Number of genomes	GI < CI	Clusters	GIs in clusters*	Percentage clustered (%)	Prediction Accuracy (%)
CI-0	++++	2191	267	1	20**	40**	1.8	99.9
CI-5	+++	2047	260	9	99	202	10.0	98.6
CI-10	++	1787	246	11	134	271	15.3	97.5
CI-25	+	1370	220	16	185	383	28.3	94.8
Total analyzed		2609	322

The totals represent the total numbers in the original data set from IslandViewer.
*) The percentage of clustered GIs (second last column) excludes 17 GIs from the total number of GIs (third column), since there are 17 genomes with a single GI only, and with less than two GIs there can be no clustering.
**) Six out of 20 clusters contain in fact largely identical Genomic Islands, which explains their high compositional similarity.

ISSN: 1471-2164