Related Experiment Videos
Ultrastructural observations of lethal yellow (Ay/Ay) mouse embryos
Journal of Embryology and Experimental Morphology
|February 1, 1976
Summary
The Ay/Ay mouse embryo exhibits excluded blastomeres with early developmental characteristics, suggesting developmental arrest. Non-excluded cells appear normal initially but degenerate later in the blastocyst stage.
Area of Science:
- Developmental Biology
- Genetics
- Cell Biology
Background:
- The Ay/Ay allele in mice is associated with developmental abnormalities.
- Understanding the cellular basis of these abnormalities is crucial for developmental biology research.
Purpose of the Study:
- To investigate the cellular and ultrastructural characteristics of excluded blastomeres in Ay/Ay embryos.
- To compare these features with non-excluded cells in mutant embryos and control embryos.
Main Methods:
- Cytological examination of Ay/Ay embryos.
- Ultrastructural analysis of cell organelles, inclusions, and junctions.
- Comparison between excluded and non-excluded blastomeres.
Main Results:
- Excluded blastomeres in Ay/Ay embryos displayed characteristics of earlier developmental stages, indicating potential cell cycle arrest.
- Non-excluded cells of Ay/Ay embryos maintained normal morphology until the late blastocyst stage, when degenerative changes were observed.
- Interior cells (inner cell mass) were present in all examined mutant blastocysts.
Conclusions:
- The +Ay gene's mechanism of action remains undetermined.
- Evidence suggests +Ay gene effects manifest across early cleavage and implantation stages.
- Excluded blastomeres represent a key feature of Ay/Ay embryonic development, possibly linked to developmental arrest.