Nucleic Acids Research, 2002, Vol. 30, No. 14 3152-3162
© 2002 Oxford University Press
Identification of 113 conserved essential genes using a high-throughput gene disruption system in Streptococcus pneumoniae
Department of Microbiology and 1 Department of Applied Genomics, Bristol-Myers Squibb Pharmaceutical Research Institute, Wallingford, CT 06492, USA
*To whom correspondence should be addressed at present address: Achillion Pharmaceuticals, 300 George Street, New Haven, CT 06511, USA. Tel: +1 203 624 7000; Fax: +1 203 624 7003; Email: mpucci{at}achillion.com
Present addresses:
Jane A. Thanassi, Achillion Pharmaceuticals, 300 George Street, New Haven, CT 06511, USA
Sandra L. Hartman-Neumann and Thomas J. Dougherty, AI2, Pfizer Global Research and Development, Mailstop 8220-2358, Eastern Point Road, Groton, CT 06340, USA
The recent availability of bacterial genome sequence information permits the identification of conserved genes that are potential targets for novel antibiotic drug discovery. Using a coupled bioinformatic/experimental approach, a list of candidate conserved genes was generated using a Microbial Concordance bioinformatics tool followed by a targeted disruption campaign. Pneumococcal sequence data allowed for the design of precise PCR primers to clone the desired gene target fragments into the pEVP3 suicide vector. An insertionduplication approach was employed that used the pEVP3 constructs and resulted in the introduction of a selectable chloramphenicol resistance marker into the chromosome. In the case of non-essential genes, cells can survive the disruption and form chloramphenicol-resistant colonies. A total of 347 candidate reading frames were subjected to disruption analysis, with 113 presumed to be essential due to lack of recovery of antibiotic-resistant colonies. In addition to essentiality determination, the same high-throughput methodology was used to overexpress gene products and to examine possible polarity effects for all essential genes.
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