Abstract
The study of gene expression and accurate quantitation of target genes in any organism depends on correct normalisation. Due to the increase in studies on Oenococcus oeni gene expression, there is a clear need for alternative reference genes in order to reliably measure expression levels. In this manuscript, we propose the approach of using multiple reference genes to provide a more robust basis for establishing a reference gene set. The identification and evaluation of a panel of nine reference genes, including the commonly used ldhD, for real-time PCR normalisation was performed in O. oeni. Expression levels of these reference genes were then measured by real-time qPCR in an independent set of O. oeni samples (n = 30). The nine genes were ranked according to their stability of gene expression measure (M) using geNorm to identify the most consistently expressed reference genes. This approach resulted in the identification of multiple reference genes that may be used for a screening and more robust normalisation of target gene expression measured by real-time RT-qPCR. Expression of esterase genes was then measured in these O. oeni samples in the presence of known esterase substrates. The results give an indication of how these genes may be involved in ester synthesis and hydrolysis in O. oeni.
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The research in this paper was undertaken as part of project UA 05/01 supported by Australia’s grape growers and winemakers through their investment body, the Grape and Wine Research Development Corporation, with matching funds from the Australian Government. K.S. is supported by a Grape and Wine Research Development Corporation scholarship. The University of Adelaide is a member of the Wine Innovation Cluster in Adelaide (wineinnovationcluster.com).
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Adelaide University is a member of the Wine Innovation Cluster
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Sumby, K.M., Grbin, P.R. & Jiranek, V. Validation of the use of multiple internal control genes, and the application of real-time quantitative PCR, to study esterase gene expression in Oenococcus oeni . Appl Microbiol Biotechnol 96, 1039–1047 (2012). https://doi.org/10.1007/s00253-012-4409-1
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DOI: https://doi.org/10.1007/s00253-012-4409-1