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Yeast colony size reflects YAC copy number
A V Popov1, C Bützler, M Brüggemann
1Department of Development and Genetics, The Babraham Institute, Cambridge CB2 4AT, UK. andrei.popov@bbsrc.ac.uk
Nucleic Acids Research
|May 15, 1997
Summary
A new method uses yeast cell growth to separate multiple yeast artificial chromosomes (YACs). Small yeast colonies on selection plates indicate single-copy YACs, enabling easier YAC manipulation and research.
Area of Science:
- Molecular Biology
- Genetics
- Yeast Genetics
Background:
- Yeast artificial chromosomes (YACs) are crucial for cloning large DNA fragments.
- Separating co-cloned YACs is a common challenge in molecular biology.
- Efficient YAC separation is essential for downstream applications like gene modification.
Purpose of the Study:
- To develop a novel strategy for the efficient separation of co-cloned YACs.
- To establish a method for reducing YAC copy number for subsequent YAC modification procedures.
Main Methods:
- Yeast cells containing multiple YACs were cultured under non-selective conditions.
- Mitotic loss of YACs was induced by culturing.
- Yeast colonies were plated on 'drop-out' selection media.
- Colony size was used to identify single-copy YAC clones.
- Auxotrophic marker genes were utilized for YAC separation and copy number reduction.
Main Results:
- A novel strategy for separating co-cloned YACs was successfully developed.
- Small yeast colonies on selection plates consistently contained single-copy YACs.
- The method allows for the reduction of YAC copy number.
Conclusions:
- The developed strategy provides an effective means for separating co-cloned YACs.
- This technique facilitates YAC manipulation by enabling the isolation of single-copy YACs.
- The method is essential for various YAC-modification procedures in genetic research.