title: Selection analyses of insertional mutants using subgenic-resolution arrays.
abstract: We describe a method of genome-wide analysis of quantitative growth phenotypes using insertional mutagenesis and DNA microarrays. We applied the method to assess the fitness contributions of Escherichia coli gene domains under specific growth conditions. A transposon library was subjected to competitive growth selection in Luria-Bertani (LB) and in glucose minimal media. Transposon-containing genomic DNA fragments from the selected libraries were compared with the initial unselected transposon insertion library on DNA microarrays to identify insertions that affect fitness. Genes involved in the biosynthesis of nutrients not provided in the growth medium were found to be significantly enriched in the set of genes containing negatively selected insertions. The data also identify fitness contributions of several uncharacterized genes, including putative transcriptional regulators and enzymes. The applicability of this high-resolution array selection in other species is discussed.
authors.affiliation: Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: V
authors.initials: V
authors.lastname: Badarinarayana
authors.forename: P W
authors.initials: PW
authors.lastname: Estep
authors.forename: J
authors.initials: J
authors.lastname: Shendure
authors.forename: J
authors.initials: J
authors.lastname: Edwards
authors.forename: S
authors.initials: S
authors.lastname: Tavazoie
authors.forename: F
authors.initials: F
authors.lastname: Lam
authors.forename: G M
authors.initials: GM
authors.lastname: Church
mesh_terms: D003470:Culture Media; D018983:DNA Footprinting / Q000379:methods*; D004251:DNA Transposable Elements; D004926:Escherichia coli / Q000235:genetics* / Q000254:growth & development; D029968:Escherichia coli Proteins / Q000235:genetics / Q000502:physiology; D016680:Genome, Bacterial; D015698:Genomic Library; D016254:Mutagenesis, Insertional / Q000379:methods*; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D010641:Phenotype
chemical_list: D003470:Culture Media; D004251:DNA Transposable Elements; D029968:Escherichia coli Proteins