Monteiro-Vitorello Claudia B, de Oliveira Mariana C, Zerillo Marcelo M, Varani Alessandro M, Civerolo Edwin, Van Sluys Marie-Anne
Labinfo-LNCC, Petrópolis, RJ, Brazil.
OMICS. 2005 Summer;9(2):146-59. doi: 10.1089/omi.2005.9.146.
The gamma-proteobacterium Xanthomonadales groups two closely related genera of plant pathogens, Xanthomonas and Xylella. Whole genome sequencing and comparative analyses disclosed a high degree of identity and co-linearity of the chromosome backbone between species and strains. Differences observed are usually clustered into genomic islands, most of which are delimited by genetic mobile elements. Focus is given in this paper to describe which groups of mobile elements are found and what is the relative contribution of these elements to Xanthomonas and Xylella genomes. Insertion sequence (IS) elements have invaded the Xanthomonas genome several times, whereas Xylella is rich in phage-related regions. Also, different plasmids are found inhabiting the bacterial cells studied here. Altogether, these results suggest that the integrative elements such as phages and transposable elements as well as the episomal plasmids are important drivers of the genome evolution of this important group of plant pathogens.
γ-变形菌纲黄单胞菌目包含两个密切相关的植物病原体属，即黄单胞菌属和木质部菌属。全基因组测序和比较分析揭示了不同物种和菌株之间染色体骨架的高度一致性和共线性。观察到的差异通常集中在基因组岛中，其中大部分由基因移动元件界定。本文重点描述了发现了哪些移动元件组，以及这些元件对黄单胞菌属和木质部菌属基因组的相对贡献。插入序列（IS）元件多次侵入黄单胞菌基因组，而木质部菌属富含噬菌体相关区域。此外，在这里研究的细菌细胞中发现了不同的质粒。总之，这些结果表明，噬菌体和转座元件等整合元件以及附加体质粒是这一重要植物病原体群体基因组进化的重要驱动力。
