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Ribosome synthesis in Tetrahymena: a quantitative analysis
L K Larsen1, P H Andreasen, K Kristiansen
1Department of Molecular Biology, Odense University, Campusvej 55, Odense M, DK-5230, Denmark.
Cell Biology International
|March 29, 2000
Summary
Nutritional changes in Tetrahymena thermophila affect ribosomal RNA and protein gene expression. Gene transcription and mRNA translation are regulated by nutritional shifts and involve shared nuclear factors.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Ribosomes are essential for protein synthesis.
- Ribosomal RNA (rRNA) and ribosomal protein (RP) synthesis must be tightly coordinated.
- Tetrahymena thermophila is a model organism for studying gene regulation.
Purpose of the Study:
- To quantitatively analyze rRNA and RP mRNA transcription and accumulation in Tetrahymena thermophila.
- To investigate the impact of altered growth conditions on ribosomal gene expression.
- To explore the regulatory mechanisms coordinating rRNA and RP gene expression.
Main Methods:
- Quantitative analysis of transcription and mRNA accumulation.
- In vitro nuclear factor binding assays.
- Manipulation of growth conditions (nutritional downshifts, upshifts, starvation).
Main Results:
- Nutritional downshifts rapidly decrease transcriptional activity; upshifts restore it.
- Starvation reduces ribosomal protein mRNA translation.
- Ribosomal protein mRNA degradation rate decreases after nutritional upshifts.
- Evidence suggests shared nuclear factors regulate rRNA and RP gene promoters.
Conclusions:
- Tetrahymena thermophila exhibits dynamic regulation of ribosomal biogenesis in response to nutritional cues.
- Coordinated regulation of rRNA and RP genes likely involves competition for common transcriptional regulators.
- These findings provide insights into the molecular mechanisms governing ribosome production.