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Transfer RNA and aminoacyl transfer RNA in developing rats
Biology of the Neonate
|January 1, 1976
Summary
Total transfer RNA (tRNA) levels varied by organ in developing rats, with higher amounts in liver and kidney. Aminoacylation capacity remained stable, but in vivo aminoacylation increased with age.
Area of Science:
- Biochemistry
- Molecular Biology
- Developmental Biology
Background:
- Transfer RNA (tRNA) is crucial for protein synthesis, translating genetic information into proteins.
- Understanding tRNA levels and function during development is essential for comprehending cellular growth and differentiation.
Purpose of the Study:
- To quantify total tRNA levels in various rat tissues during development.
- To assess the aminoacylation capacity and in vivo aminoacylation status of specific tRNA species across different developmental stages.
Main Methods:
- Total tRNA was purified from rat liver, kidney, skeletal muscle, and heart muscle using (3H)tRNA as an internal standard.
- Aminoacylation capacities of six specific tRNA species were measured in rat liver across suckling, weaning, and young adult stages.
- In vivo aminoacylation percentages of four tRNA species were determined at different developmental time points.
Main Results:
- Liver and kidney tissues exhibited approximately twice the tRNA concentration per gram compared to heart and skeletal muscle.
- No significant differences in total tRNA levels were observed between male and female rats.
- Aminoacylation capacities for six key tRNA species remained consistent across suckling, weaning, and young adult stages.
- In vivo aminoacylation of aspartyl-, leucyl-, methionyl-, and phenylalanyl-tRNAs was lower in newborn and suckling rats compared to older stages.
- Young adult rat livers showed near-complete in vivo aminoacylation for most tRNAs, except for alanyl-tRNA.
Conclusions:
- Tissue-specific differences in total tRNA abundance exist in developing rats, with higher concentrations in metabolically active organs like the liver and kidney.
- While the capacity for aminoacylation is maintained, the efficiency of in vivo tRNA charging increases with age, suggesting developmental regulation of translation.
- These findings highlight the dynamic regulation of tRNA metabolism during postnatal development, impacting protein synthesis efficiency.