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We have previously shown differences in virulence between species of the Burkholderia cepacia complex using the alfalfa infection model and the rat agar bead chronic infection model. Burkholderia cenocepacia strains were more virulent in these two infection models than Burkholderia multivorans and Burkholderia stabilis strains. In order to identify genes that may account for the increased virulence of B. cenocepacia, suppression-subtractive hybridization was performed between B. cenocepacia K56-2 and B. multivorans C5393 and between B. cenocepacia K56-2 and B. stabilis LMG14294. Genes identified included DNA modification/phage-related/insertion sequences and genes involved in cell membrane/surface structures, resistance, transport, metabolism, regulation, secretion systems, as well as genes of unknown function. Several of these genes were present in the ET12 lineage of B. cenocepacia but not in other members of the B. cepacia complex. Virulence studies in a chronic lung infection model determined that the hypothetical YfjI protein, which is unique to the ET12 clone, contributes to lung pathology. Other genes specific to B. cenocepacia and/or the ET12 lineage were shown to play a role in biofilm formation and swarming or swimming motility.

journal of bacteriology

Use of Suppression-Subtractive Hybridization To Identify Genes in the <i>Burkholderia cepacia</i> Complex That Are Unique to <i>Burkholderia cenocepacia</i>

Use of Suppression-Subtractive Hybridization To Identify Genes in the Burkholderia cepacia Complex That Are Unique to Burkholderia cenocepacia