Related Experiment Videos
The case for prepatterning in the mouse.
1Mammalian Development Laboratory, Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, United Kingdom. richard.gardner@zoology.ox.ac.uk
Birth Defects Research. Part C, Embryo Today : Reviews
|July 22, 2005
Summary
Early mammalian development shows nonrandom patterns in the zygote and two-cell conceptus, suggesting prepatterning rather than solely cell interactions. This indicates intrinsic organization may play a role before fertilization.
Area of Science:
- Developmental biology
- Cell biology
- Embryology
Background:
- Early embryonic development in mammals is thought to rely on blastomere interactions.
- Blastomeres are widely considered equipotential until the eight-cell stage.
- Patterning of the blastocyst is crucial for subsequent development.
Purpose of the Study:
- To investigate the nonrandom mapping of early conceptus features onto the blastocyst.
- To explore the role of prepatterning in mammalian embryonic development.
- To determine the contribution of oocyte organization versus fertilization events to early patterning.
Main Methods:
- Analysis of zygote and two-cell conceptus features.
- Utilizing various laboratory techniques across multiple studies.
- Mapping of features onto the blastocyst's axis of polarity and bilateral plane.
Main Results:
- Features of the zygote and two-cell conceptus map nonrandomly on the blastocyst.
- This nonrandom mapping contradicts the equipotential blastomere model.
- Evidence suggests prepatterning is a normal aspect of mammalian development.
Conclusions:
- Mammalian development likely involves prepatterning, not solely post-fertilization interactions.
- The extent of oocyte's intrinsic organization in prepatterning requires further investigation.
- Distinguishing between oocyte organization and fertilization-dependent events is key.