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Analysis of interchromosomal mitotic recombination
C B McGill1, B K Shafer, D R Higgins
1NCI-Frederick Cancer Research and Development Center, Laboratory of Eukaryotic Gene Expression, MD 21702-1201.
Current Genetics
|July 1, 1990
Summary
This study introduces a new synthetic locus in yeast for studying mitotic recombination. The findings reveal details about recombination intermediates, suggesting symmetric strand exchange and extended conversion tracts.
Area of Science:
- Molecular Biology
- Genetics
- Yeast Genetics
Background:
- Characterizing mitotic recombination is crucial for understanding genome stability.
- Existing methods for analyzing mitotic recombination can be complex and labor-intensive.
Purpose of the Study:
- To develop a novel synthetic locus in Saccharomyces cerevisiae (yeast) for a simplified assay of mitotic recombinants.
- To analyze the distribution and characteristics of spontaneous and induced mitotic recombination events.
Main Methods:
- Construction of a synthetic locus on chromosome III of S. cerevisiae containing TRP1 and HIS3 genes.
- Generation of defined alleles for selection of interchromosomal recombinants.
- Classification of recombinants based on linked alleles (CRY1 and MAT) and their phenotypes.
- Analysis of spontaneous and UV-induced recombination events.
Main Results:
- A novel assay system effectively characterizes mitotic recombinants in yeast.
- Spontaneous recombination data suggest symmetric strand exchange and co-conversion tracts of 1-3 kb.
- Continuous conversion tracts appear to be favored over discontinuous ones.
- UV irradiation alters the distribution of recombination events.
Conclusions:
- The developed synthetic locus provides a powerful tool for studying mitotic recombination.
- The results offer insights into the structure and mechanisms of recombination intermediates.
- The findings highlight differences in recombination patterns between spontaneous and induced events.