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Cellular morphology in haploid amphibian embryos

M S Ellinger, J A Murphy

    Journal of Embryology and Experimental Morphology
    |October 1, 1980
    PubMed
    Summary

    Haploid amphibian embryos exhibit widespread cellular anomalies, including abnormal cell shapes and ratios, contributing to developmental defects in the haploid syndrome. These morphological defects are likely the cause of gross anomalies observed in haploid embryos.

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    Area of Science:

    • Developmental Biology
    • Amphibian Embryology
    • Cellular Morphology

    Background:

    • The amphibian haploid syndrome is characterized by significant developmental abnormalities.
    • Understanding the underlying cellular mechanisms is crucial for explaining these gross morphological defects.

    Purpose of the Study:

    • To investigate the contribution of cellular morphology to the amphibian haploid syndrome.
    • To compare the surface cellular morphology of haploid and diploid Bombina orientalis embryos.

    Main Methods:

    • Scanning electron microscopy (SEM) was used to examine the external surfaces of haploid and diploid Bombina orientalis embryos.
    • Detailed analysis of cellular structures, including epithelium, ciliated cells, and adhesive organs.

    Main Results:

    • Haploid embryos displayed prevalent cellular anomalies across all surface areas.
    • Epithelial cells showed displacement of ciliated cells and rounded non-ciliated cells, altering the ciliated to non-ciliated cell ratio.
    • Gill filaments and adhesive organs were morphologically abnormal, with fused adhesive organs in haploid embryos. Severe microcephaly in haploid embryos correlated with reduced cell size uniformity in head regions.

    Conclusions:

    • Aberrant cellular morphologies are widespread in haploid amphibian embryos.
    • These cellular defects are strongly implicated as major contributors to the gross morphological anomalies observed in the haploid syndrome.

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