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Pseudomonas aeruginosa PAO1 bacterial artificial chromosomes: strategies for mapping, screening, and sequencing 100 kb loci of the 5.9 Mb genome



Pseudomonas aeruginosa PAO1 bacterial artificial chromosomes: strategies for mapping, screening, and sequencing 100 kb loci of the 5.9 Mb genome



Microbial and Comparative Genomics 3(2): 105-117



Pseudomonas aeruginosa is an opportunistic bacterial pathogen frequently found in nosocomial infections and is a major cause of morbidity and mortality in patients with cystic fibrosis. To facilitate molecular studies of this organism, we have generated a bacterial artificial chromosome (BAC) library. Genomic DNA was isolated from the prototype strain PAO1, partially digested with HindIII, size selected after pulsed-field gel electrophoresis, and used to construct a BAC library using the pBeloBAC11 vector. DNAs from approximately 850 clones, representing more than 9.5-fold physical coverage of the 5.9-Mb PAO1 genome, were analyzed after SpeI and HindIII digestions and agarose gel electrophoresis. The BAC library had clones with insert fragments ranging from 20 to more than 290 kb. A subset of 264 BACs having inserts > 80 kb, representing > 4 genome equivalents, were rearrayed into 96-well plates, and a clone pooling and PCR screening strategy was developed. The PCR library screening enabled the identification and recovery of BACs containing genes implicated in cell division and in cell wall biosynthesis, as well as a series of known genes mapping to different regions of the PAO1 chromosome. A physical and genetic map was constructed for the 98-kb pMOC5 BAC clone, which spans the entire fts-mur locus. Chromosome walking from each end of the pMOC5 clone placed it within a contig spanning 243 kb. The BAC library and screening resources now allow a PCR-based screening of a P. aeruginosa genomic library for any gene of interest. The restriction fragment analysis of overlapping clones indicated that BAC clones stably maintain and propagate Pseudomonas DNA, providing evidence that the PAO1 BAC library is an appropriate reagent for genome sequencing.

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Accession: 047119170

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PMID: 9697095

DOI: 10.1089/omi.1.1998.3.105


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