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Activation tagging in Arabidopsis.
D Weigel1, J H Ahn, M A Blázquez
1Plant Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037, USA. weigel@salk.edu
Plant Physiology
|April 12, 2000
Summary
Activation tagging in Arabidopsis using T-DNA vectors identified over 30 dominant mutants. The cauliflower mosaic virus (CaMV) 35S enhancers near genes altered their expression, revealing new discovery potential.
Area of Science:
- Plant molecular biology
- Genetics
- Biotechnology
Background:
- Activation tagging is a powerful forward genetics approach.
- T-DNA insertion into plant genomes can activate or modify gene expression.
Purpose of the Study:
- To develop and apply novel activation-tagging vectors in Arabidopsis.
- To identify genes involved in various plant phenotypes through enhancer-driven overexpression.
Main Methods:
- Generation of Arabidopsis transgenic lines using T-DNA vectors with multimerized cauliflower mosaic virus (CaMV) 35S enhancers.
- Selection of transformants conferring resistance to kanamycin or glufosinate.
- Screening for dominant mutants with altered phenotypes.
Main Results:
- Tens of thousands of transformed Arabidopsis plants were generated.
- Over 30 dominant mutants exhibiting diverse phenotypes were isolated.
- Overexpressed genes were located near the CaMV 35S enhancers (380 bp to 3.6 kb).
Conclusions:
- The CaMV 35S enhancers can activate gene expression in Arabidopsis, leading to mutant phenotypes.
- Enhancer activity may primarily boost endogenous expression rather than causing constitutive ectopic expression.
- This activation-tagging strategy expands the repertoire of genes discoverable through enhancer-driven expression analysis.