FIG 4.

Genetic configurations of the variants with a typical AbGRI1 structure. In this study, the typical AbGRI1 structure was defined as an element containing an intact “Tn6022-linker-Tn6172” backbone. The proposed ancestral form (AbGRI1-0) of AbGRI1-type elements is shown above. The Tn6022 or ΔTn6022 part is shown in orange, the Tn6172 part or its partial segments are shown in blue, while the linker region is shown in green. The backbone segments in the variants are placed in aligned positions or otherwise connected by gray. The syntenic regions between Tn6172ISCR2::(ΔISCR2-ΔTn10) and its disrupted form are also connected by gray. The names of the reported elements bearing the corresponding genetic configurations are given. NA, not available. Novel genetic configurations are shown in red. The letter “i” in the names “AbaR4iΔ1” and “AbaR4i” indicates that the Tn2006 transposon in AbaR4iΔ1 and AbaR4i are inverted compared to that in AbaR4Δ1 and AbaR4, respectively. The schematic representations are drawn to scale.