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Development of mPing-based activation tags for crop insertional mutagenesis
Alexander Johnson1, Edward Mcassey1,2, Stephanie Diaz3,4
1Institute of Plant Breeding, Genetics & Genomics/Center for Applied Genetic Technologies University of Georgia Athens GA USA.
Plant Direct
|January 28, 2021
Summary
Researchers developed a novel activation tagging system using a modified rice transposon, mPing, to identify genes controlling crop traits. This tool enhances gene discovery in soybean by inducing gene expression, accelerating crop improvement.
Area of Science:
- Plant genetics
- Molecular biology
- Crop science
Background:
- Genomic information is crucial for modern plant breeding and crop improvement.
- Identifying genes linked to specific crop traits requires advanced tools beyond current gene characterization methods.
Purpose of the Study:
- To modify the rice mPing element into an activation tag for inducing gene expression and facilitating gene discovery in crops.
- To overcome limitations in transposition rates by utilizing a hyperactive mPing variant.
Main Methods:
- Engineering the mPing element with promoter sequences to create an activation tag.
- Developing a hyperactive transposon variant, mmPing20, to enhance transposition efficiency.
- Generating transgenic soybean events carrying the mPing-based activation tags and transposase expression cassettes.
- Analyzing gene expression in soybean lines with heritable mmPing20F insertions.
Main Results:
- Embedding promoters in mPing reduced transposition, but this was overcome by using the hyperactive mmPing20.
- Transgenic soybean lines demonstrated successful transposition of mPing-based activation tags.
- Expression analysis confirmed that the mmPing20F activation tag induced overexpression of adjacent soybean genes.
Conclusions:
- The modified mPing element, particularly the hyperactive mmPing20 variant, serves as an effective activation tag for inducing gene expression in soybean.
- This activation tagging system represents a significant advancement in gene discovery technology, offering improved potential for inducing phenotypes and enhancing crop trait identification.
