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Diversity and plasticity of the intracellular plant pathogen and insect symbiont "Candidatus Liberibacter asiaticus" as revealed by hypervariable prophage genes with intragenic tandem repeats

文献类型： 外文期刊

作者： Zhou, Lijuan 2 ; Powell, Charles A. 2 ; Hoffman, Michele T. 1 ; Li, Wenbin 3 ; Fan, Guocheng 4 ; Liu, Bo 4 ; Lin, Hong 5 ;

作者机构： 1.USDA ARS USHRL, Ft Pierce, FL 34945 USA

2.Univ Florida, IFAS IRREC, Ft Pierce, FL 34945 USA

3.USDA APHIS PPQ CPHST NPGBL, Beltsville, MD 20705 USA

4.Fujian Acad Agr Sci, Citrus Huanglongbing Res Ctr, Fuzhou 350002, Fujian, Peoples R China

5.USDA ARS, San Joaquin Valley Agr Sci Ctr, Parlier, CA 93658 USA

期刊名称：APPLIED AND ENVIRONMENTAL MICROBIOLOGY （ 影响因子：4.792； 五年影响因子：5.26 ）

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收录情况： SCI

摘要： "Candidatus Liberibacter asiaticus" is a psyllid-transmitted, phloem-limited alphaproteobacterium and the most prevalent species of "Ca. Liberibacter" associated with a devastating worldwide citrus disease known as huanglongbing (HLB). Two related and hypervariable genes (hyv_I and hyv_II) were identified in the prophage regions of the Psy62 "Ca. Liberibacter asiaticus" genome. Sequence analyses of the hyv_I and hyv_II genes in 35 "Ca. Liberibacter asiaticus" DNA isolates collected globally revealed that the hyvI gene contains up to 12 nearly identical tandem repeats (NITRs, 132 bp) and 4 partial repeats, while hyv_II contains up to 2 NITRs and 4 partial repeats and shares homology with hyvI. Frequent deletions or insertions of these repeats within the hyv_I and hyv_II genes were observed, none of which disrupted the open reading frames. Sequence conservation within the individual repeats but an extensive variation in repeat numbers, rearrangement, and the sequences flanking the repeat region indicate the diversity and plasticity of "Ca. Liberibacter asiaticus" bacterial populations in the world. These differences were found not only in samples of distinct geographical origins but also in samples from a single origin and even from a single "Ca. Liberibacter asiaticus"-infected sample. This is the first evidence of different "Ca. Liberibacter asiaticus" populations coexisting in a single HLB-affected sample. The Florida "Ca. Liberibacter asiaticus" isolates contain both hyv_I and hyv_II, while all other global "Ca. Liberibacter asiaticus" isolates contain either one or the other. Interclade assignments of the putative Hyv_I and Hyv_II proteins from Florida isolates with other global isolates in phylogenetic trees imply multiple "Ca. Liberibacter asiaticus" populations in the world and a multisource introduction of the "Ca. Liberibacter asiaticus" bacterium into Florida.

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