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Hyperdorsoanterior embryos from Xenopus eggs treated with D2O
1Department of Molecular Biology, University of California, Berkeley 94720.
Developmental Biology
|July 1, 1989
Summary
Heavy water (D2O) exposure in Xenopus laevis eggs can cause excessive dorsalization, leading to duplicated or enlarged head structures. This suggests a widespread potential for dorsal development in early embryos.
Area of Science:
- Developmental Biology
- Embryology
- Xenopus laevis research
Background:
- Cortical rotation is crucial for establishing embryonic polarity.
- The Spemann organizer is a key signaling center in vertebrate development.
Purpose of the Study:
- To investigate the effects of deuterium oxide (D2O) on Xenopus laevis embryonic development.
- To understand the role of D2O in dorsalization and embryonic patterning.
Main Methods:
- Treatment of Xenopus laevis eggs with varying concentrations of D2O (30-70%).
- Observation of embryonic development and anatomical changes following D2O exposure during early cell cycles.
Main Results:
- D2O treatment induced dose-dependent dorsalization, with enlarged anterior and dorsal structures.
- Embryos exhibited twinning of dorsoanterior structures and cylindrical symmetry in severe cases.
- D2O appeared to enhance sensitivity to cortical rotation, potentially duplicating signaling centers.
Conclusions:
- Xenopus embryos possess a latent potential for dorsal development across their circumference.
- Normal embryonic patterning relies on the restricted activation of this dorsal developmental potential.
- D2O treatment provides a model for studying the mechanisms of dorsal axis formation.