Zusammenfassung
Quantitative real-time polymerase chain reaction (qRT-PCR) is a reliable
technique for quantifying mRNA levels when normalised by a stable
reference gene/s. Many putative reference genes are known to be affected
by physiological stresses, such as nutrient limitation and hence may not
be suitable for normalisation. In this study of Pseudomonas aeruginosa,
the expression of 13 commonly used reference genes, rpoS, proC, recA,
rpsL, rho, oprL, anr, tipA, nadB, fabD, ampC, algD and gyrA, were
analysed for changes in expression under carbon starvation and nutrient
replete conditions. The results showed that rpoS was the only stably
expressed housekeeping gene during carbon starvation. In contrast, other
commonly used housekeeping genes were shown to vary by as much as 10-100
fold under starvation conditions. This study has identified a suitable
reference gene for qRT-PCR in P. aeruginosa during carbon starvation.
The results presented here highlight the need to validate housekeeping
genes under the chosen experimental conditions. (C) 2016 Elsevier B.V.
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