Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Transcription profiling of Mycobacterium tuberculosis grown under iron-limitation in continuous culture

ABSTRACT: Data is also available from http://bugs.sgul.ac.uk/E-BUGS-35

INSTRUMENT(S): Chemostat

ORGANISM(S): Mycobacterium tuberculosis

SUBMITTER:

PROVIDER: E-BUGS-35 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Lipid composition and transcriptional response of Mycobacterium tuberculosis grown under iron-limitation in continuous culture: identification of a novel wax ester.

Bacon Joanna J Dover Lynn G LG Hatch Kim A KA Zhang Yi Y Gomes Jessica M JM Kendall Sharon S Wernisch Lorenz L Stoker Neil G NG Butcher Philip D PD Besra Gurdyal S GS Marsh Philip D PD

Microbiology (Reading, England) 20070501 Pt 5

The low level of available iron in vivo is a major obstacle for microbial pathogens and is a stimulus for the expression of virulence genes. In this study, Mycobacterium tuberculosis H37Rv was grown aerobically in the presence of limited iron availability in chemostat culture to determine the physiological response of the organism to iron-limitation. A previously unidentified wax ester accumulated under iron-limited growth, and changes in the abundance of triacylglycerol and menaquinone were als ...[more]

PMID: 17464057

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Project description:In some of the earliest uses of genome-wide gene-expression microarrays and array-based Comparative Genomic Hybridization (aCGH), a set of diploid yeasts that had undergone experimental evolution under aerobic glucose limitation was used to explore how gene expression and genome structure had responded to this selection pressure. To more deeply understand how adaptation to one environment might constrain or enhance performance in another we have now identified the adaptive mutations in this set of clones using whole-genome sequencing, and have assessed whether the evolved clones had become generalists or specialists by assaying their fitness under three contrasting growth environments: aerobic and anaerobic glucose limitation and aerobic acetate limitation. Additionally, evolved clones and their common ancestor were assayed for gene expression, biomass estimates and residual substrate levels under the alternative growth conditions. Relative fitnesses were evaluated by competing each clone against a common reference strain in each environment. Unexpectedly, we found that the evolved clones also outperformed their ancestor under strictly fermentative and strictly oxidative growth conditions. We conclude that yeasts evolving under aerobic glucose limitation become generalists for carbon limitation, as the mutations selected for in one environment are advantageous in others. High-throughput sequencing of the evolved clones uncovered mutations in genes involved in glucose sensing, signaling, and transport that in part explain these physiological phenotypes, with different sets of mutations found in independently-evolved clones. Earlier gene expression data from aerobic glucose-limited cultures had revealed a shift from fermentation towards respiration in all evolved clones explaining increased fitness in that condition. However, because the evolved clones also show higher fitness under strictly anaerobic conditions and under conditions requiring strictly respirative growth, this switch cannot be the sole source of adaptive benefit. Furthermore, because independently evolved clones are genetically distinct we conclude that there are multiple mutational paths leading to the generalist phenotype. Strain Name: Parental strain (CP1AB) or evolved clones (E1 - E5) Media: aerobic / anaerobic 36 hybridizations

Dataset Information

Transcription profiling of Mycobacterium tuberculosis grown under iron-limitation in continuous culture

Publications

Lipid composition and transcriptional response of Mycobacterium tuberculosis grown under iron-limitation in continuous culture: identification of a novel wax ester.

Similar Datasets

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