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Effective qPCR methodology to quantify the expression of virulence genes in Aeromonas salmonicida subsp salmonicida
Umeå University, Faculty of Medicine, Department of Molecular Biology (Faculty of Medicine).
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2015 (English)In: Journal of Applied Microbiology, ISSN 1364-5072, E-ISSN 1365-2672, Vol. 118, no 4, 792-802 p.Article in journal (Refereed) Published
Abstract [en]

Aims This study aimed to select and validate different methodological strategies to quantify the expression of the virulence genes ascC and ascV by qPCR in Aeromonas salmonicida subsp. salmonicida (Aer. salmonicida). Methods and Results Using the geNorm, Normfinder and BestKeeper algorithms, reference genes for the qPCR were selected based on their in vitro expression stabilities in three Aer. salmonicida strains. Gene amplification efficiency was calculated by Real-time PCR Miner and LinReg PCR programmes, which have not been used previously in the analysis of bacterial gene expression. The expression of the ascC and ascV virulence genes in a virulent Aer. salmonicida strain was evaluated by three quantification models, including single (least or most stable) or three most stable reference genes, combined with constant or specific gene amplification efficiency. The most stable reference genes were gyrB, proC and rpoC, while rpoD and fabD were the least stable. Quantification models showed different expression patterns. Conclusions The optimal strategy to quantify mRNA expression was to use a combination of the three algorithms and the quantification model including the three most stable reference genes. Real-time PCR Miner or LinReg PCR were valuable tools to estimate amplification efficiency. Significance and Impact of the Study The methods used in this study gave more reliable expression data using qPCR than previously published methods. The quantification and expression dynamics of virulence genes will contribute to a better understanding of how Aer. salmonicida interacts with its host and the environment, and therefore to the prevention of epizootics due to this pathogen.

Place, publisher, year, edition, pages
2015. Vol. 118, no 4, 792-802 p.
Keyword [en]
Aeromonas salmonicida subsp, salmonicida, gene expression, normalization, qPCR, reference genes
National Category
Microbiology in the medical area Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy) Microbiology
URN: urn:nbn:se:umu:diva-102103DOI: 10.1111/jam.12740ISI: 000351392200002PubMedID: 25619119OAI: diva2:806831
Available from: 2015-04-21 Created: 2015-04-21 Last updated: 2015-04-21Bibliographically approved

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Milton, Debra L.
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Department of Molecular Biology (Faculty of Medicine)
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Journal of Applied Microbiology
Microbiology in the medical areaMedical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)Microbiology

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