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A biochemical framework for RNA silencing in plants
Guiliang Tang1, Brenda J Reinhart, David P Bartel
1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.
Genes & Development
|January 7, 2003
Summary
Plant RNA silencing mechanisms are biochemically analyzed, revealing Dicer-like enzymes and RNA-dependent RNA polymerase activity. Endogenous microRNAs (miRNAs) guide endonucleases to degrade specific messenger RNAs, crucial for plant development.
Area of Science:
- Molecular Biology
- Plant Science
- Genetics
Background:
- RNA silencing, including RNA interference (RNAi), was first identified in plants.
- Biochemical analysis of RNA silencing has been predominantly focused on animal systems.
Purpose of the Study:
- To extend biochemical analysis to plant RNA silencing pathways.
- To investigate the role of microRNAs (miRNAs) in plant RNA silencing and development.
Main Methods:
- Biochemical analysis of wheat germ extract and plant embryo extract.
- Characterization of Dicer-like enzymes and RNA-dependent RNA polymerase activity.
- Assay of microRNA-guided messenger RNA cleavage in vitro.
Main Results:
- Wheat germ extract contains Dicer-like enzymes producing small interfering RNAs from double-stranded RNA (dsRNA).
- An RNA-dependent RNA polymerase activity converts single-stranded RNA into dsRNA.
- Endogenous plant microRNAs (miRNAs) function as small interfering RNAs, guiding endonucleases to cleave target messenger RNAs.
Conclusions:
- Plant microRNAs direct RNA interference (RNAi) pathways.
- MicroRNA-guided messenger RNA destruction is vital for proper plant development.
- Endonuclease complexes guided by small RNAs are conserved across animal and plant kingdoms.