Figure 7.

Horizontal Gene Transfer in B. breve strains. (A) Presence/absence of detected motifs in genomes ordered by frequency of occurrence. B. breve strains are grouped into two distinct clusters based on the genome length and the contribution of presence of CRISPR and R/M on HGT. Discriminant of the two groups at 2.4 Mb is also indicated. (B) Boxplot showing the inverse correlation between the presence of CRISPR and/or short-target R/M systems and variome size (expressed as number of accessory gene families [GF] in genomes). Median of each group and exact P-value are also indicated. Hypothesis tested with the Mann–Withney U test (significance P < 0.05).