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Embryonic diapause in vertebrates

R A Mead1

  • 1Department of Biological Sciences, University of Idaho, Moscow 83843.

The Journal of Experimental Zoology
|September 1, 1993
PubMed
Summary
This summary is machine-generated.

Embryonic diapause, a reproductive strategy, varies greatly among vertebrates. Hormonal and uterine factors controlling this arrested embryonic development differ significantly across species, presenting ongoing scientific mysteries.

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Comparative Physiology

Background:

  • Embryonic diapause is a conserved reproductive strategy across diverse vertebrate species.
  • The physiological mechanisms controlling embryonic diapause exhibit significant interspecies variation.
  • Understanding diapause is crucial for reproductive biology and conservation efforts.

Purpose of the Study:

  • To review and compare the diverse physiological mechanisms controlling embryonic diapause across vertebrate groups.
  • To highlight the differing roles of temperature, hormones, and uterine environment in diapause.
  • To identify knowledge gaps and future research directions in embryonic diapause.

Main Methods:

  • Comparative analysis of existing literature on embryonic diapause in various vertebrate species.

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  • Examination of hormonal regulation, including prolactin, progesterone, and estrogen.
  • Review of uterine changes and their potential role in embryonic development.

    • Main Results:

    • Embryonic development arrest occurs at the blastocyst stage in mammals with delayed implantation.
    • Hormonal control varies: prolactin, progesterone, and estrogen have species-specific effects on diapause.
    • Uterine secretions and histological changes are critical for maintaining diapause, but their precise role in development resumption is unclear.

    Conclusions:

    • Embryonic diapause mechanisms are highly divergent, particularly in hormonal and uterine regulation.
    • Significant gaps remain in understanding how embryonic development is initiated after diapause.
    • Further research is needed to elucidate the complex interplay of factors governing embryonic diapause and its reactivation.