Related Experiment Video
Updated: Jun 12, 2026
12:31
Zebrafish Whole Mount High-Resolution Double Fluorescent In Situ Hybridization
Published on: March 25, 2009
Non-core subunit eIF3h of translation initiation factor eIF3 regulates zebrafish embryonic development
Avik Choudhuri1, Todd Evans, Umadas Maitra
1Department of Developmental and Molecular Biology, Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, USA.
Summary
The study reveals that non-core subunits of eukaryotic translation initiation factor 3 (eIF3), specifically eIF3h, are crucial for zebrafish embryonic development. These findings highlight the role of eIF3h in regulating brain, heart, and vascular formation.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Eukaryotic translation initiation factor 3 (eIF3) is essential for protein synthesis.
- Higher eukaryotes possess additional non-core subunits absent in yeast.
- The role of these non-core subunits in vertebrate development is largely unexplored.
Purpose of the Study:
- To investigate the function of the non-core eIF3 subunit, eIF3h, in zebrafish embryonic development.
- To determine the specific roles of the two zebrafish eIF3h isoforms (eif3ha and eif3hb).
Main Methods:
- Analysis of eif3ha and eif3hb gene expression patterns during zebrafish embryogenesis.
- Loss-of-function studies using morpholino oligonucleotides to disrupt eIF3h function.
- Phenotypic analysis of morphants to assess developmental defects.
Main Results:
- Both eif3h genes are expressed during early embryogenesis with dynamic, overlapping expression patterns.
- Loss of eIF3h function leads to specific and redundant developmental defects.
- Morphant phenotypes include abnormalities in brain, heart, vasculature, and lateral line development.
- Spatial expression patterns correlate with observed developmental defects.
Conclusions:
- Non-core eIF3 subunits, exemplified by eIF3h, play critical roles in vertebrate embryonic development.
- eIF3h isoforms regulate specific developmental programs, including neural, cardiac, and vascular systems.
- These findings expand our understanding of eIF3 complex function beyond basic translation initiation.
