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Stage-specific gene expression in early chick embryo
1Department of Biology, University of Patras, Greece.
Abstract:
Inhibition of DNA replication by aphidicolin in the chick morula interferes with its progression to a normal blastula and prevents induction of the first morphogenetic cell movements of primitive streak formation. Embryos in aphidicolin synthesize some polypeptides typical of blastula but do not display all the characteristic features of morula to blastula transition. Inhibition of DNA replication interferes with the sequential synthesis of maternally coded polypeptides and with the activation of the embryonic genome in the chick embryo.
Insights
Aphidicolin halts DNA replication, blocking chick embryo development at the morula stage. This inhibition prevents blastula formation and primitive streak development by disrupting gene activation and protein synthesis.
Area of Science:
- Developmental biology
- Molecular biology
- Cell biology
Background:
- Early embryonic development in chicks involves precise cell movements and gene expression.
- DNA replication is crucial for cell division and developmental progression.
Purpose of the Study:
- To investigate the role of DNA replication in early chick embryogenesis.
- To determine the effects of inhibiting DNA replication on morula to blastula transition and gastrulation.
Main Methods:
- Chick embryos at the morula stage were treated with aphidicolin, a DNA replication inhibitor.
- Analysis of polypeptide synthesis and embryonic genome activation was performed.
Main Results:
- Aphidicolin treatment prevented progression to the blastula stage and inhibited primitive streak formation.
- Embryos synthesized some blastula-specific polypeptides but lacked complete morula-to-blastula transition features.
- Inhibition of DNA replication disrupted maternal polypeptide synthesis and embryonic gene activation.
Conclusions:
- DNA replication is essential for the morula to blastula transition and the initiation of gastrulation in chick embryos.
- Inhibiting DNA replication impacts both maternal and embryonic gene expression programs during early development.