\name{EcoliOxygen}
\docType{data}
\alias{EcoliOxygen}
\alias{gds680.eset}
\alias{subset.gds680.eset}
\alias{filtered.regulon6.1}
\alias{subset.filtered.regulon6.1}

\title{Preprocessed microarray oxygen deprivation data and filtered RegulonDB data}

\description{The data consist of two classes of objects, one
containing normalized gene expression microarray data from Escherichia
coli (E. coli) and the other containing a subset of filtered RegulonDB
transcription regulatory relationships on E. coli.
}

\usage{
data(EcoliOxygen)
}

\format{
  \tabular{ll}{
    \code{gds680.eset}\tab \code{ExpressionSet} object containing n=43 experiments
         of various mutants under oxygen deprivation (Covert et al., 2004). The
         mutants were designed to monitor the response from E. coli during an
         oxygen shift in order to target the a priori most relevant part of the
         transcriptional network by using six strains with knockouts of five
         key transcriptional regulators in the oxygen response (\emph{arcA},
         \emph{appY}, \emph{fnr}, \emph{oxyR} and \emph{soxS}). The data was
         obtained by downloading the corresponding CEL files from the Gene
         Expression Omnibus (\url{http://www.ncbi.nlm.nih.gov/geo}) under
         accession \code{GDS680} and then normalized using the \code{rma()}
         function from the \code{affy} package. Following the steps described in
         (Castelo and Roverato, 2009) probesets were mapped to Entrez Gene
         Identifiers and filtered such that the current \code{ExpressionSet}
         object contains a total of p=4205 genes. The slot \code{featureNames}
         has already the corresponding Entrez Gene IDs.\cr
    \code{subset.gds680.eset}\tab \code{ExpressionSet} object corresponding to
         a subset of \code{gds680.eset} defined by the transcription factor
         genes that were knocked-out in the experiments by Covert et al. (2004)
         and their putative targets according to the RegulonDB database version
         6.1.\cr
    \code{filtered.regulon6.1}\tab Data frame object containing a subset of the
         E. coli transcriptional network from RegulonDB 6.1 (Gama-Castro et al,
         2008) obtained through the filtering steps described in (Castelo and
         Roverato, 2009). In this data frame each row corresponds to a
         transcriptional regulatory relationship and the first two columns
         contain Blattner IDs of the transcription factor and target genes,
         respectively, and the following two correspond to the same genes but
         specified by Entrez Gene IDs. The fifth column contains the direction
         of the regulation according to RegulonDB.\cr
    \code{subset.filtered.regulon6.1}\tab Subset of \code{filtered.regulon6.1}
         containing the transcriptional regulatory relationships in RegulonDB
         version 6.1 that involve the transcription factor genes which were
         knocked-out in the experiments by Covert et al. (2004).\cr
  }
}
\examples{
data(EcoliOxygen)
ls()
}
\source{
Covert, M.W., Knight, E.M., Reed, J.L., Herrgard, M.J., and Palsson, B.O.
Integrating high-throughput and computational data elucidates bacterial networks.
\emph{Nature}, 429(6987):92-96, 2004.

Gama-Castro, S., Jimenez-Jacinto, V., Peralta-Gil, M., Santos-Zavaleta, A.,
Penaloza-Spinola, M.I., Contreras-Moreira, B., Segura-Salazar, J., Muniz-Rascado,
L., Martinez-Flores, I., Salgado, H., Bonavides-Martinez, C., Abreu-Goodger, C.,
Rodriguez-Penagos, C., Miranda-Rios, J., Morett, E., Merino, E., Huerta, A.M.,
Trevino-Quintanilla, L., and Collado-Vides, J. RegulonDB (version 6.0): gene
regulation model of Escherichia coli K-12 beyond transcription, active
(experimental) annotated promoters and Textpresso navigation.
\emph{Nucleic Acids Res.}, 36(Database issue):D120-124, 2008.
}

\references{
Castelo, R. and Roverato, A. Reverse engineering molecular regulatory
networks from microarray data with qp-graphs. \emph{J. Comp. Biol.},
16(2):213-227, 2009.
}

\keyword{datasets}
