A new set of reference genes for comparative gene expression analyses in Yarrowia lipolytica.

FEMS Yeast Research
Monika BorkowskaEwelina Celińska

Abstract

Accurate quantitation of gene expression levels require sensitive, precise and reproducible measurements of specific transcripts. Normalization to a reference gene is the most common practice to minimize the impact of the uncontrolled variation. The fundamental prerequisite for an accurate reference gene is to be stably expressed amongst all the samples included in the analysis. In the present study we aimed to assess the expression level and stability of a panel of 21 genes in Yarrowia lipolytica throughout varying conditions, covering composition of the culturing medium, growth phase and strain-wild type and recombinant burdened with heterologous protein overexpression. The panel of the selected candidate genes covered those essential for growth and maintenance of metabolism and homologs of commonly used internal references in RT-qPCR. The candidate genes expression level and stability were assessed and the data were processed using dedicated computational tools (geNorm and NormFinder). The results obtained here indicated genes unaffected by the burden of overexpression (TEF1, TPI1, UBC2, SRPN2, ALG9-like, RYL1) or by the culture medium used (ACT1, TPI1, UBC2, SEC61, ODC, CLA4, FKS1, TPS1), as well as those the least (SSDH, O...Continue Reading

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