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Retrofitting YACs for direct DNA transfer into plant cells
G Adam1, J A Mullen, K L Kindle
1Plant Science Center, Cornell University, Ithaca, NY 14853-2703, USA. adam@edu2.boku.ac.at
The Plant Journal : for Cell and Molecular Biology
|June 1, 1997
Summary
Researchers developed new vectors to modify yeast artificial chromosomes (YACs) for direct plant transformation. This innovation enhances the utility of YAC libraries for genetic studies and crop improvement.
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Yeast Genetics
Background:
- Yeast artificial chromosomes (YACs) are valuable for cloning large DNA fragments but their direct use in plant transformation is limited.
- Existing methods require complex procedures to adapt YACs for plant transformation.
Purpose of the Study:
- To develop a novel method for modifying YACs to enable direct plant transformation.
- To enhance the utility of plant YAC libraries for genetic analysis and crop improvement.
Main Methods:
- Developed a pair of vectors for retrofitting YACs using yeast's homologous recombination system.
- Introduced plant-selectable markers and copy number amplification elements into YACs.
- Tested retrofitted YACs ranging from 80 to 700 kb for DNA isolation and plant transformation via particle bombardment.
Main Results:
- Successfully modified YACs using a two-step yeast transformation process.
- Achieved a 6- to 12-fold increase in YAC copy number, facilitating DNA isolation.
- Demonstrated efficient transfer of large DNA inserts from retrofitted YACs into plant cells via particle bombardment.
Conclusions:
- The developed retrofitting vectors significantly improve the direct transfer of YAC DNA into plant cells.
- This approach bridges the gap between YAC-based mapping techniques and plant transformation procedures.
- Facilitates the application of YAC libraries in plant genetic engineering and functional genomics.
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