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        Concurrent growth rate and transcript analyses reveal essential gene stringency in Escherichia coli

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        Author
        Goh, Shan
        Boberek, Jaroslaw M
        Nakashima, Nobutaka
        Stach, Jem
        Good, Liam
        Attention
        2299/20577
        Abstract
        BACKGROUND: Genes essential for bacterial growth are of particular scientific interest. Many putative essential genes have been identified or predicted in several species, however, little is known about gene expression requirement stringency, which may be an important aspect of bacterial physiology and likely a determining factor in drug target development. METHODOLOGY/PRINCIPAL FINDINGS: Working from the premise that essential genes differ in absolute requirement for growth, we describe silencing of putative essential genes in E. coli to obtain a titration of declining growth rates and transcript levels by using antisense peptide nucleic acids (PNA) and expressed antisense RNA. The relationship between mRNA decline and growth rate decline reflects the degree of essentiality, or stringency, of an essential gene, which is here defined by the minimum transcript level for a 50% reduction in growth rate (MTL(50)). When applied to four growth essential genes, both RNA silencing methods resulted in MTL(50) values that reveal acpP as the most stringently required of the four genes examined, with ftsZ the next most stringently required. The established antibacterial targets murA and fabI were less stringently required. CONCLUSIONS: RNA silencing can reveal stringent requirements for gene expression with respect to growth. This method may be used to validate existing essential genes and to quantify drug target requirement.
        Publication date
        2009-06-26
        Published in
        PLoS ONE
        Published version
        https://doi.org/10.1371/journal.pone.0006061
        License
        http://creativecommons.org/licenses/by/4.0/
        Other links
        http://hdl.handle.net/2299/20577
        Relations
        School of Life and Medical Sciences
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