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mRNA encoding the translation initiation factor eIF-4E is expressed early in Xenopus embryogenesis
M Wakiyama1, M Saigoh, K Shiokawa
1Institute for Biomolecular Science, Faculty of Science, Gakushuin University, Tokyo, Japan.
FEBS Letters
|February 27, 1995
Summary
The eukaryotic translation initiation factor 4E (eIF-4E) mRNA in Xenopus embryos was studied. Researchers found this important mRNA is produced during oogenesis and persists through early embryogenesis.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- The translation initiation factor eIF-4E is crucial for regulating translation rates in eukaryotic cells.
- Understanding the expression of eIF-4E itself is important for comprehending gene expression control.
- Xenopus embryos serve as a model organism for studying early developmental processes.
Purpose of the Study:
- To characterize the eIF-4E mRNA in Xenopus embryos.
- To investigate the expression patterns of eIF-4E mRNA during oogenesis and embryogenesis.
Main Methods:
- 5'-RACE (Rapid Amplification of cDNA Ends) was used to determine the 5'-end of the eIF-4E mRNA.
- RT-PCR (Reverse Transcription Polymerase Chain Reaction) was employed to examine eIF-4E mRNA expression levels.
Main Results:
- The 5'-RACE analysis predicted the existence of eIF-4E isoforms with variations at the amino-terminal end.
- RT-PCR confirmed that Xenopus eIF-4E mRNA is synthesized during oogenesis.
- eIF-4E mRNA was found to be present and maintained during the early stages of Xenopus embryogenesis.
Conclusions:
- Xenopus eIF-4E mRNA exhibits distinct isoforms, suggesting alternative translation initiation.
- eIF-4E mRNA functions as a maternal mRNA, supplied by the oocyte for early embryonic development.
- The maternal supply of eIF-4E mRNA likely supports protein synthesis crucial for Xenopus development.