MITE Aba12 , a Novel Mobile Miniature Inverted-Repeat Transposable Element Identified in Acinetobacter baumannii ATCC 17978 and Its Prevalence across the Moraxellaceae Family
Abstract
Insertion sequences (IS) are fundamental mediators of genome plasticity with the potential to generate phenotypic variation with significant evolutionary outcomes. Here, a recently active miniature inverted-repeat transposon element (MITE) was identified in a derivative of Acinetobacter baumannii ATCC 17978 after being subjected to stress conditions. Transposition of the novel element led to the disruption of the hns gene, resulting in a characteristic hypermotile phenotype. DNA identity shared between the terminal inverted repeats of this MITE and coresident ISAba12 elements, together with the generation of 9-bp target site duplications, provides strong evidence that ISAba12 elements were responsible for mobilization of the MITE (designated MITE Aba12 ) within this strain. A wider genome-level survey identified MITE Aba12 in 30 additional Acinetobacter genomes at various frequencies and one Moraxella osloensis genome. Ninety MITE Aba12 copies could be identified, of which 40% had target site duplications, indicating recent transposition events. Elements ranged between 111 and 114 bp; 90% were 113 bp in length. Using the MITE Aba12 consensus sequence, putative outward-facing Escherichia coli σ70 promoter sequences in bo...Continue Reading
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ygiW and qseBC are co-expressed in Aggregatibacter actinomycetemcomitans and regulate biofilm growth
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