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Heritable and inducible genetic interference by double-stranded RNA encoded by transgenes
N Tavernarakis1, S L Wang, M Dorovkov
1Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA.
Nature Genetics
|February 2, 2000
Summary
Heritable inverted-repeat (IR) genes enable potent and stable gene silencing via RNA interference (RNAi) in Caenorhabditis elegans. This advance overcomes limitations of traditional RNAi for studying gene function in development and the nervous system.
Area of Science:
- Molecular Biology
- Genetics
- Developmental Biology
Background:
- Double-stranded RNA interference (RNAi) is a powerful reverse-genetics tool for gene expression disruption.
- Limitations in Caenorhabditis elegans include unstable inheritance of introduced dsRNA and reduced efficacy for late-acting or neuronally expressed genes.
Purpose of the Study:
- To enhance the applicability of RNAi by developing a method for heritable, in vivo gene silencing.
- To address challenges in gene disruption for viability/reproduction, mutant phenocopy generation, and nervous system gene inactivation.
Main Methods:
- Constructed transgenic Caenorhabditis elegans expressing heritable inverted-repeat (IR) genes.
- Assayed the efficacy of in vivo-driven RNAi for potent and specific gene inactivation.
Main Results:
- Heritable IR genes conferred potent and specific gene inactivation across tested applications.
- Successfully produced animals deficient for essential genes and generated phenocopy mutants.
- Achieved effective gene inactivation in the nervous system.
Conclusions:
- In vivo expression of heritable IR genes significantly extends the utility of RNAi in Caenorhabditis elegans.
- This strategy offers a robust method for genetic studies, including in challenging contexts like the nervous system.
- The approach may be adaptable for testing RNAi in higher organisms with transgenic capabilities.