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Induction of gastrulation in the chick embryo
1Department of Biology, University of Patras, Greece.
Insights
Alpha-amanitin inhibits primitive streak (PS) formation by altering protein synthesis in the hypoblast, not the epiblast. These hypoblast changes suggest a role for specific proteins in regulating PS development.
Area of Science:
- Developmental biology
- Molecular embryology
- Chick embryo development
Background:
- Primitive streak (PS) formation in chick blastula is induced by epiblast-hypoblast interaction.
- Alpha-amanitin inhibits polyadenylated RNA synthesis, impacting gene expression.
Purpose of the Study:
- To investigate the effect of alpha-amanitin on protein synthesis during primitive streak (PS) formation.
- To determine the role of hypoblast protein synthesis in PS induction.
Main Methods:
- Treatment of chick blastula with alpha-amanitin, a specific inhibitor of polyadenylated RNA synthesis.
- Analysis of protein synthesis patterns in epiblast and hypoblast tissues using gel electrophoresis.
Main Results:
- Alpha-amanitin treatment inhibited definitive primitive streak (PS) formation.
- Qualitative changes in hypoblast protein synthesis were observed, with decreased synthesis of several polypeptides.
- Epiblast protein synthesis showed increased production of some polypeptides, but hypoblast changes were more pronounced.
Conclusions:
- Alpha-amanitin-sensitive translational products in the hypoblast are implicated in the control of primitive streak (PS) induction.
- Hypoblast protein synthesis plays a critical role in regulating PS formation and stabilization.
Abstract:
Interaction between the epiblast and the primary hypoblast in chick blastula results in induction of the primitive streak (PS) in the epiblast. Alpha-amanitin, a specific inhibitor of poly A-containing RNA synthesis, inhibits formation of the definitive PS. This inhibition is associated with qualitative changes in the pattern of protein synthesis in the hypoblast but not in the epiblast. The protein pattern of the component areas of the epiblast shows increase in some polypeptides after treatment with alpha-amanitin. By contrast, alpha-amanitin resulted in a decrease in synthesis of several polypeptides, which are either undetectable or weakly present in the hypoblast. The alpha-amanitin-sensitive translational products of the embryonic genome that are observed in the hypoblast may have specific functions in the control of PS induction and stabilization.