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Studies of t6/t6 mouse embryos
Journal of Embryology and Experimental Morphology
|June 1, 1975
Summary
The t6/t6 genome mutation causes early mouse embryo death, primarily during the egg-cylinder stage. Distinct cellular abnormalities, including lipid droplets and mitochondrial changes, appear in mutant embryos by the late blastocyst stage.
Area of Science:
- Developmental Biology
- Genetics
- Cell Biology
Background:
- The t6/t6 genome mutation is associated with embryonic lethality in mice.
- Understanding the precise timing and cellular basis of this lethality is crucial for developmental studies.
Purpose of the Study:
- To define the phenocritical period of the t6/t6 genome mutation.
- To identify early cellular markers for t6/t6 mutant embryos.
Main Methods:
- Light and electron microscopy were used to examine t6/t6 mouse embryos.
- Embryos were analyzed at late blastocyst and egg-cylinder stages.
Main Results:
- The phenocritical period spans from late blastocyst to elongated egg-cylinder stages, with most homozygous embryos dying during the short egg-cylinder stage.
- Viable t6/t6 embryos exhibit aberrantly arranged entodermal cells, excessive cytoplasmic lipid, and crystal-containing mitochondria.
- Over 50% of t6/t6 embryos show large, electron-dense cytoplasmic lipid droplets by the late blastocyst stage.
Conclusions:
- Early detection of t6/t6 mutant embryos is possible via distinct morphological and ultrastructural features.
- These cellular abnormalities are indicative of developmental arrest and lethality associated with the t6/t6 mutation.