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Polyubiquitin RNA characteristics and conditional induction in sea urchin embryos
M Nemer1, E Rondinelli, D Infante
1Institute for Cancer Research, Fox Chase Cancer Center, Philadelphia, Pennsylvania 19111.
Developmental Biology
|June 1, 1991
Summary
Sea urchin polyubiquitin RNA levels remain stable during early development but are influenced by environmental stressors like heat shock and zinc ions. These stressors can alter RNA processing and depend on embryonic integrity for induction.
Area of Science:
- Molecular Biology
- Developmental Biology
- Marine Biology
Background:
- Polyubiquitin is crucial for cellular processes and is encoded by a single gene with multiple coding units.
- Polyubiquitin transcripts in sea urchins exist in various forms and locations within the cell.
- Understanding polyubiquitin gene regulation provides insights into cellular stress responses and development.
Purpose of the Study:
- To identify and characterize the sea urchin polyubiquitin gene and its transcripts.
- To investigate the regulation of polyubiquitin RNA levels during sea urchin development.
- To examine the effects of environmental stimuli, such as heat shock and zinc ions, on polyubiquitin RNA expression.
Main Methods:
- cDNA identification and sequencing of the sea urchin polyubiquitin gene.
- RNA isolation from different developmental stages and cellular compartments (nuclei, polyribosomes).
- Northern blot analysis to detect and quantify polyubiquitin RNA transcripts of varying sizes.
- Induction experiments using heat shock and zinc ions, followed by tissue fraction analysis.
Main Results:
- A single sea urchin gene encodes polyubiquitin, producing transcripts with multiple ubiquitin coding units.
- Polyubiquitin RNA levels are relatively constant from egg to blastula, then decline, but increase transiently with heat shock and accumulate with zinc ions.
- Zinc ion induction shows developmental and tissue-specific patterns, with altered RNA processing observed after repeated exposure and dependence on embryonic integrity.
Conclusions:
- Sea urchin polyubiquitin gene expression is tightly regulated during development and responsive to environmental stressors.
- The differential accumulation and processing of polyubiquitin RNAs suggest complex regulatory mechanisms influenced by developmental stage and embryo integrity.
- Polyubiquitin RNA induction by zinc ions is modulated by prior exposure and the overall condition of the embryo, highlighting the interplay between development and stress response.