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Cell division and cell allocation in early mouse development.

S J Kelly, J G Mulnard, C F Graham

    Journal of Embryology and Experimental Morphology
    |December 1, 1978
    PubMed
    Summary
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    Early mouse embryo cell division timing influences cell fate. Cells dividing sooner contribute more to the inner cell mass (ICM), impacting development up to the blastocyst stage.

    Area of Science:

    • Developmental Biology
    • Cell Biology
    • Embryology

    Background:

    • Understanding cell division timing is crucial for early mammalian development.
    • Asynchronous cell division is common in early mouse embryos.

    Purpose of the Study:

    • To investigate the relationship between cell division timing and cell fate in early mouse embryos.
    • To determine if the timing of cell division influences the contribution of cells to the inner cell mass (ICM).

    Main Methods:

    • Observation of cell division in intact and dissociated mouse embryos from the 2-cell to blastocyst stage in culture.
    • Labeling of cells dividing at specific stages (4-cell to 8-cell) using tritiated thymidine.
    • Reassembly of embryos to track cell lineage and contribution to the ICM.

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    Main Results:

    • Asynchronous cell division was observed, with the first cell to divide at the 4-cell stage producing descendants that divided earlier in subsequent stages.
    • Descendants of the first dividing cell did not exhibit shorter cell cycles.
    • The first pair of cells to reach the 8-cell stage contributed disproportionately more cells to the ICM compared to the last dividing cells.

    Conclusions:

    • The timing of cell division in early mouse embryos is a determinant of cell fate.
    • Early-dividing cells are preferentially incorporated into the ICM, suggesting a role in lineage specification.
    • This finding provides insights into the mechanisms governing cell differentiation during preimplantation development.