Mobile genetic elements (MGE) play a large role in the plasticity of genomes, participating in several phenomena which involve genes acquisition. Pseudomonas stutzeri is an environmental widely distributed bacteria. This bacteria has a very large genomic plasticity, which would explain its occurrence in several different environments. NCBI data bank and online programs were used to build an inventory to investigate diversity and structure of MGE in Pseudomonas stutzeri, searching for insertion sequences (IS), integrases/transposases, plasmids and prophages. Five hundred and forty-eight ISs, 62 integrases, 166 transposases, five plasmids and eight complete prophages were found. MGE location and adjacent genes were investigated. Possible implications of the presence of these mobile elements explaining phenotypic diversity of Pseudomonas stutzeri were discussed. The study showed that MGEs might be good clues to understand the dynamics of genomes and their phenotypic plasticity, although they are not the only elements responsible for these characteristics.
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