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Effectiveness of RNA interference in transgenic plants
Arthur Kerschen1, Carolyn A Napoli, Richard A Jorgensen
1Department of Plant Sciences, University of Arizona, Tucson, AZ 85721, USA.
FEBS Letters
|May 19, 2004
Summary
Transgene-induced RNA interference (RNAi) effectiveness varies by target gene. Single-copy RNAi lines show consistent transcript reduction, while multi-copy lines are less predictable, suggesting inherent target susceptibility to dsRNA.
Area of Science:
- Molecular Biology
- Genetics
- Plant Science
Background:
- RNA interference (RNAi) is a tool for studying gene function via transcript degradation.
- Systematic comparisons of transgene-induced RNAi effectiveness across multiple genes are lacking.
Purpose of the Study:
- To systematically compare the effectiveness of transgene-induced RNAi across diverse target genes.
- To develop a robust method for quantifying RNAi efficacy.
Main Methods:
- Developed a relative quantitative RT-PCR protocol with a single internal standard.
- Analyzed 25 transgenic Arabidopsis thaliana RNAi lines targeting different endogenous genes.
- Compared transcript reduction in single-copy vs. multi-copy T4 RNAi lines.
Main Results:
- Independent, homozygous, single-copy (sc) T4 lines targeting the same gene showed consistent transcript level reduction.
- Multi-copy RNAi lines exhibited variable target reduction, never exceeding the effect of sc transgenes.
- The maximum reduction of target transcript levels differed among various target sequences.
Conclusions:
- Each target sequence has an inherent susceptibility to dsRNA-mediated degradation.
- Single-copy transgenes provide more predictable RNAi outcomes.
- The developed RT-PCR method enables reliable quantification of RNAi efficacy across different targets.