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The Arabidopsis thaliana cDNAs coding for eIF4E and eIF(iso)4E are not functionally equivalent for yeast
C M Rodriguez1, M A Freire, C Camilleri
1INRA, Laboratoire de Biologie Cellulaire, Versailles, France.
The Plant Journal : for Cell and Molecular Biology
|July 29, 1998
Summary
Researchers identified two eukaryotic initiation factor genes in Arabidopsis thaliana, At.EIF4E1 and At.EIF4E2. Differential gene expression suggests distinct roles for these factors in plant development and metabolism.
Area of Science:
- Molecular Biology
- Plant Science
- Genetics
Background:
- Eukaryotic initiation factors (eIFs) are crucial for protein synthesis.
- Specific eIF4E isoforms play distinct roles in translation regulation.
- Understanding plant eIF4E function is key to deciphering gene expression control.
Purpose of the Study:
- To isolate and characterize two Arabidopsis thaliana cDNAs encoding eIF4E and eIF(iso)4E.
- To investigate the expression patterns and potential functions of these plant eIF4E isoforms.
- To explore the association between eIF4E mRNA levels and cell proliferation.
Main Methods:
- Complementation of a Saccharomyces cerevisiae conditional mutant.
- Sequence analysis of deduced amino acid sequences.
- Gene identification using YAC clones.
- Northern and in situ hybridization for mRNA expression analysis.
Main Results:
- Two cDNAs, At.EIF4E1 and At.EIF4E2, were isolated and their protein sequences showed homology to other eukaryotes.
- At.EIF4E1 and At.EIF4E2 genes map to Arabidopsis chromosomes IV and V, respectively.
- Differential mRNA accumulation was observed: At.EIF4E1 in most tissues (except root specialization zone) and At.EIF4E2 in floral and young developing tissues.
- A yeast strain expressing At.EIF4E2 showed poorer growth than one expressing At.EIF4E1.
Conclusions:
- Arabidopsis thaliana possesses distinct eIF4E isoforms with differential tissue-specific expression.
- A correlation exists between high eIF4E mRNA levels and cell proliferation.
- Plant eIF4E isoforms likely have specialized functions in cellular development and metabolism.