Quantification of transgene-derived double-stranded RNA in plants using the QuantiGene nucleic acid detection...

Area of Science:

• Agricultural Biotechnology
• Molecular Biology
• Entomology

Background:

• RNA interference (RNAi) is expanding in agricultural biotechnology.
• Characterizing double-stranded RNA (dsRNA)-containing transcripts in transgenic plants is crucial.
• Transgenic maize targeting western corn rootworm (Diabrotica virgifera virgifera) uses DvSnf7 dsRNA expression.

Purpose of the Study:

• To develop and validate a quantitative assay for detecting dsRNA-containing transcripts in transgenic maize.
• To enable characterization of DvSnf7 dsRNA transcripts for pest control efficacy.
• To provide a non-PCR based method for dsRNA quantification.

Main Methods:

• Developed a quantitative assay using the QuantiGene Plex 2.0 RNA assay platform.
• Utilized cooperative binding of specific oligonucleotide probes for high assay specificity.
• Required heat denaturation prior to hybridization to dissociate dsRNA structures.
• Validated the assay using purified RNA and crude tissue lysates from maize.

Main Results:

• The assay sensitively detects dsRNA (down to 10 pg/g fresh tissue).
• Demonstrated high reproducibility and linearity over 2.5 logs.
• Confirmed quantitative performance in crude maize tissue lysates.
• Established the assay as the first non-PCR based quantitative method for dsRNA transcripts using QuantiGene technology.

Conclusions:

• The developed QuantiGene-based assay effectively quantifies dsRNA-containing transcripts in transgenic maize.
• This assay provides a sensitive, reproducible, and quantitative tool for agricultural biotechnology research.
• The method will facilitate broader characterization of dsRNA in biological and environmental samples.