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Transposons of the <jats:italic>mariner<\/jats:italic> family do not require species-specific host factors for efficient transposition, integrate nonspecifically at T\/A base pairs, and, at a minimum, provide an alternative approach for gene discovery. In this study, plasmid vector pSC189, containing both the hyperactive transposase C9 and transposon terminal inverted repeats flanking a kanamycin resistance gene, were used to deliver <jats:italic>Himar1<\/jats:italic> transposable element into the <jats:italic>B. melitensis<\/jats:italic> genome. Conjugation was performed efficiently and rapidly in less than one generation in order to minimize the formation of siblings while assuring the highest level of genome coverage.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Although previously identified groups or classes of genes required for virulence and survival were represented in the screen, additional novel identifications were revealed and may be attributable to the difference in insertion sequence biases of the two transposons. Mutants identified using a fluorescence-based macrophage screen were further evaluated using gentamicin-based protection assay in macrophages, survival in the mouse splenic clearance model and growth <jats:italic>in vitro<\/jats:italic> to identify mutants with reduced growth rates.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>The identification of novel genes within previously described groups was expected, and nearly two-thirds of the 95 genes had not been previously reported as contributing to survival and virulence using random Tn5-based mutagenesis. The results of this work provide added insight with regard to the regulatory elements, nutritional demands and mechanisms required for efficient intracellular growth and survival of the organism.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2180-6-102","type":"journal-article","created":{"date-parts":[[2006,12,19]],"date-time":"2006-12-19T07:16:56Z","timestamp":1166512616000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":73,"title":["Mariner mutagenesis of Brucella melitensis reveals genes with previously uncharacterized roles in virulence and survival"],"prefix":"10.1186","volume":"6","author":[{"given":"Qingmin","family":"Wu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianwu","family":"Pei","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carol","family":"Turse","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas A","family":"Ficht","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2006,12,18]]},"reference":[{"issue":"14","key":"315_CR1","doi-asserted-by":"publisher","first-page":"e113","DOI":"10.1093\/nar\/gnh112","volume":"32","author":"PR Herron","year":"2004","unstructured":"Herron PR, Hughes G, Chandra G, Fielding S, Dyson PJ: Transposon Express, a software application to report the identity of insertions obtained by comprehensive transposon mutagenesis of sequenced genomes: analysis of the preference for in vitro Tn5 transposition into GC-rich DNA. 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