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Timing mechanisms in early embryonic development.

N Satoh

    Differentiation; Research in Biological Diversity
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

    Embryonic development relies on internal timing mechanisms, or developmental clocks. Research suggests distinct clocks regulate cellular differentiation and morphogenesis, offering a framework for future studies.

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    Area of Science:

    • Developmental biology
    • Cellular biology
    • Embryology

    Background:

    • Embryological development occurs across four dimensions, necessitating internal time-measuring processes.
    • Emerging evidence indicates that developmental clocks control key events in early embryonic development.

    Purpose of the Study:

    • To review recent research on developmental timing mechanisms.
    • To speculate on the underlying molecular and cellular mechanisms driving these clocks.

    Main Methods:

    • Literature review of recent studies on developmental timing.
    • Synthesis of existing observations and theoretical frameworks.

    Main Results:

    • A single, fertilization-initiated clock for all embryonic events appears unfeasible.

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  • Distinct clock mechanisms likely govern cellular differentiation and morphogenesis.
  • Cellular differentiation timing may link to DNA replication cycles.
  • Morphogenesis timing appears regulated by cytoplasmic clocks.

    • Conclusions:

    • Developmental timing is complex, involving potentially independent mechanisms.
    • Proposed clock mechanisms provide a framework for organizing current data.
    • This framework can guide future experimental investigations into developmental clocks.