Fig. 2

Distribution of 710 core genes in 11 Vibrio genomes. Location of core (a) and shell (a) genes on Chr 1 and Chr 2 of 11 Vibrionaceae genomes. Circular plots are arranged regarding the phylogenetic relationship of the investigated isolates. Each plot is centered at a gene assumed to be close to the replication origin: mioC on Chr 1 and rtcB on Chr 2. As shown, a majority of core genes on Chr 1 is located closer to ori1 than to ter. Shell genes show the opposite distribution pattern on Chr 1, where majority of shell genes accumulate closer to ter. On Chr 2 both core and shell genes are randomly distributed. The dashed line “i” indicates a region on Chr 1 surrounding ori1 that contains very few core genes. The dashed line “ii” shows a region on Chr 1 of approximately 500 kb surrounding ter that is more sparsely populated with core genes than the rest of the chromosome