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In vivo and in vitro studies on the early embryonic lethal oligosyndactylism (Os) in the mouse
Abstract:
The development of mouse embryos homozygous for oligosyndactylism (Os) is arrested during implantation. Histological investigations confirm a previous report that cells become blocked in mitosis, and air-dried spreads of the mutant embryos reveal that large numbers of cells accumulate in metaphase. Trophoblastic giant cells appear unaffected by the action of the mutant gene both in utero and during culture over the lethal phase. It is proposed that the form of endoreduplication undergone by giant cells renders them refractory to the metaphase block.
Insights
Mouse embryo development halts at implantation due to the oligosyndactylism (Os) gene mutation, causing a mitotic block. Giant cells are unaffected, suggesting a resistance to this developmental arrest.
Area of Science:
- Developmental Biology
- Genetics
- Cell Biology
Background:
- The oligosyndactylism (Os) mutation in mice leads to developmental arrest.
- Previous studies indicated a blockage in cell division during embryonic development.
Purpose of the Study:
- To investigate the cellular mechanisms underlying the implantation defect in oligosyndactylism (Os) mutant mouse embryos.
- To determine the specific stage of cell cycle arrest and identify cell types affected by the Os mutation.
Main Methods:
- Histological examination of mutant mouse embryos.
- Analysis of air-dried cell spreads from embryos to assess mitotic progression.
- In utero and in vitro culture of embryos during the lethal phase.
Main Results:
- Embryonic development is arrested at the implantation stage in Os homozygous mutants.
- Cells in mutant embryos accumulate in metaphase, indicating a mitotic block.
- Trophoblastic giant cells are not affected by the mutation, showing normal development in vitro and in utero.
Conclusions:
- The oligosyndactylism (Os) gene is crucial for successful implantation and progression through mitosis.
- Trophoblastic giant cells may be resistant to the metaphase block due to their unique endoreduplication process.