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The primitive streak.

R Bellairs

    Anatomy and Embryology
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    This review details chick embryo primitive streak development, comparing it with mouse embryos. It explores the primitive streak

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    Area of Science:

    • Developmental Biology
    • Embryology
    • Evolutionary Biology

    Background:

    • The primitive streak is a transient structure crucial for embryonic development in amniotes.
    • Understanding its formation and function provides insights into early embryogenesis and evolutionary origins.
    • Limited recent research exists on reptilian primitive streaks, necessitating a comparative approach.

    Purpose of the Study:

    • To review and synthesize current knowledge on the primitive streak, focusing on chick and mouse embryos.
    • To explore the evolutionary significance of the primitive streak.
    • To examine key processes including formation, cell migration, and regression.

    Main Methods:

    • Literature review and collation of existing research on avian and mammalian primitive streaks.

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  • Comparative analysis of information available for chick, mouse, and (limited) reptile embryos.
  • Discussion of established concepts in cell biology and developmental processes.

    • Main Results:

    • Detailed examination of primitive streak formation, ingression, and de-epithelialisation.
    • Analysis of the roles of the basal lamina, extracellular matrix, and cell adhesion.
    • Exploration of primitive streak regression and its influence on body patterning and induction.

    Conclusions:

    • The primitive streak is a conserved structure with significant roles in gastrulation, cell migration, and body patterning across amniotes.
    • Comparative studies, particularly integrating avian and mammalian data, are vital for understanding its evolutionary significance.
    • Further research, especially on non-model organisms like reptiles, is needed to fully elucidate primitive streak biology.