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Reference Gene Selection to Determine Differences in Mitochondrial Gene Expressions in Phosphine-susceptible and Phosphine-resistant Strains of Cryptolestes Ferrugineus, Using QRT-PCR

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Journal Sci Rep
Specialty Science
Date 2017 Aug 3
PMID 28765619
Citations 7
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Abstract

Cryptolestes ferrugineus is a serious pest of stored grain and has developed high levels of resistance to phosphine fumigants in many countries. Measuring differences in expression levels of certain 'resistant' genes by quantitative real-time PCR (qRT-PCR) may provide insights into molecular mechanisms underlying resistance to phosphine in C. ferrugineus, but reliable qRT-PCR results depend on suitable reference genes (RGs). We evaluated the stability of nine candidate RGs across different developmental stages and phosphine strains of C. ferrugineus, using four softwares. The results showed that RPS13 and EF1α were the most stable RGs, whereas α-TUB was the least under developmental stages. Across the different strains, RPS13 and γ-TUB were the most stable RGs, whereas CycA and GAPDH were the least. We confirmed the reliability of the selected RGs by qRT-PCR analyses of the mitochondrial cox1 gene. Expression of cox1 was not significantly different in the phosphine-resistant strain compared with the phosphine-susceptible strain, but three mitochondrial genes (nad3, atp6 and cob) were significantly down-regulated. These results suggest that alterations in the expressions of these three genes may be associated with phosphine resistance in C. ferrugineus. The findings will facilitate future functional genomics studies on the development and phosphine resistance in C. ferrugineus.

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