Genome-scale identification of conditionally essential genes in E. coli by DNA microarrays

Xin Tong, John W. Campbell, Gábor Balázsi, Krin A. Kay, Barry L. Wanner, Svetlana Y. Gerdes, Zoltán N. Oltvai

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Identifying the genes required for the growth or viability of an organism under a given condition is an important step toward understanding the roles these genes play in the physiology of the organism. Currently, the combination of global transposon mutagenesis with PCR-based mapping of transposon insertion sites is the most common method for determining conditional gene essentiality. In order to accelerate the detection of essential gene products, here we test the utility and reliability of a DNA microarray technology-based method for the identification of conditionally essential genes of the bacterium, Escherichia coli, grown in rich medium under aerobic or anaerobic growth conditions using two different DNA microarray platforms. Identification and experimental verification of five hypothetical E. coli genes essential for anaerobic growth directly demonstrated the utility of the method. However, the two different DNA microarray platforms yielded largely non-overlapping results after a two standard deviations cutoff and were subjected to high false positive background levels. Thus, further methodological improvements are needed prior to the use of DNA microarrays to reliably identify conditionally essential genes on genome-scale.

Original languageEnglish (US)
Pages (from-to)347-354
Number of pages8
JournalBiochemical and Biophysical Research Communications
Issue number1
StatePublished - Sep 10 2004


  • Aerobic and anaerobic conditions
  • DNA microarray
  • E. coli
  • Essential gene
  • Transposon mutagenesis

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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