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Phosphorylation of brain and liver ribosomal proteins during early development of chick embryo
Insights
This study tracked phosphorus-32 (32P) uptake in chick embryo brain and liver ribosomal proteins. Protein activity was highest early in development and decreased significantly by day 19, indicating differing developmental rhythms.
Area of Science:
- Developmental Biology
- Biochemistry
- Molecular Biology
Background:
- Ribosomal proteins play crucial roles in protein synthesis and cellular function.
- Understanding the dynamics of protein synthesis during embryonic development is essential for comprehending developmental processes.
Purpose of the Study:
- To investigate the incorporation rate of phosphate into ribosomal proteins during chick embryonic development.
- To compare the specific activity of ribosomal proteins in the brain and liver across different developmental stages.
Main Methods:
- Intra-amniotic administration of phosphorus-32 (32P)-orthophosphate to chick embryos at 5, 9, 12, 15, and 19 days of development.
- Determination of the specific activity of brain and liver ribosomal proteins and their fractions 4 hours post-injection.
Main Results:
- Specific activity of ribosomal proteins in both brain and liver was highest in the early developmental stages.
- A rapid decline in specific activity was observed, reaching the lowest levels by day 19.
- Differences in specific activity between brain and liver ribosomal proteins suggest distinct developmental rates.
Conclusions:
- The rate of ribosomal protein synthesis and turnover varies significantly during chick embryogenesis.
- The observed disparities in ribosomal protein activity between brain and liver support the concept of asynchronous ontogenesis in different tissues.
Abstract:
32P-ortophosphate was introduced intraamnionally into 5, 9, 12, 15 and 19 day-old chick embryos. After 4 hours the specific activity of brain and liver ribosomal proteins and their fractions were determined. It was found that the specific activities of those in both tissues were highest at the early stages of development, and they declined rapidly to reach the lowest value at day 19. The observed differences between brain and liver ribosomal proteins are consistent with an unequal rhythm of ontogenesis.