Fig. 1.
AbaR are preferentially inserted in the comM gene. (A) Distribution of AbaR islands insertion sites (x axis) in the genome of 3,148 A. baumannii strains, mainly of clinical lineages (ST2, n = 1,908; ST1, n = 125; ST25, n = 53). Strains are sorted on the y axis by the number of AbaR insertions. Data were retrieved from work by Bi et al. (10). Names of some insertion sites were abbreviated (Material and Methods). (B) Phylogenetic distribution of AbaR islands in a collection of 496 diverse A. baumannii strains of clinical (blue) and environmental sources (green). AbaRs were detected by searching genomes for their left and right boundaries (CSL and CSR) as displayed when inactivating comM (blue) or inserted elsewhere in the genome (green). The branches of the clades descending from the nodes where acquisitions of AbaR islands disrupting comM occurred were colored in dark pink.