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Sporulation-regulated genes of Saccharomyces cerevisiae
B L Holaway1, D J Lehman, D A Primerano
1Department of Microbiology, University of Notre Dame, IN 46556.
Abstract:
We have characterized 46 hybrid phage which hybridize preferentially to mRNA from sporulating cells. Cross-hybridization experiments demonstrate that 27 distinct SPR (Sporulation regulated) sequences are represented among these phage. The SPR genes can be grouped into three classes: early, middle, and late. The early class shows an accumulation of transcripts soon after transfer to sporulation medium and continues to accumulate RNA throughout sporulation. Transcripts of the middle class increase in level at about the time of DNA synthesis, rise rapidly in abundance until meiosis II, then accumulate more slowly for at least the next 3 h. Late gene transcripts begin to accumulate at about the time of meiosis I, increase 10- to 20-fold in the next 2 h, then remain constant in late sporulating cells.
Insights
Researchers identified 27 distinct sporulation-regulated (SPR) gene sequences in hybrid phage. These SPR genes are categorized into early, middle, and late classes based on their transcript accumulation during cell sporulation.
Area of Science:
- Molecular Biology
- Microbiology
- Genetics
Background:
- Bacterial sporulation is a complex differentiation process involving precise gene regulation.
- Understanding the temporal expression of sporulation-regulated genes is crucial for deciphering this process.
Purpose of the Study:
- To characterize hybrid phage that hybridize to messenger RNA (mRNA) from sporulating cells.
- To identify and classify distinct sporulation-regulated (SPR) gene sequences.
- To determine the temporal expression patterns of these SPR genes during sporulation.
Main Methods:
- Characterization of 46 hybrid phage.
- Hybridization experiments using mRNA from sporulating cells.
- Cross-hybridization experiments to identify distinct SPR sequences.
- Grouping of SPR genes into temporal classes (early, middle, late).
Main Results:
- Identified 27 distinct SPR sequences among the characterized hybrid phage.
- Classified SPR genes into three temporal groups: early, middle, and late.
- Detailed the transcript accumulation patterns for each class: early genes accumulate RNA throughout sporulation; middle genes increase during DNA synthesis and meiosis II; late genes accumulate after meiosis I.
Conclusions:
- The study successfully identified and classified 27 sporulation-regulated genes.
- Demonstrated distinct temporal expression profiles for early, middle, and late SPR genes, providing a framework for understanding sporulation gene regulation.