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Related Experiment Videos

Gene expression in Xenopus embryogenesis.

I B Dawid, S R Haynes, M Jamrich

    Journal of Embryology and Experimental Morphology
    |November 1, 1985
    PubMed
    Summary
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    Xenopus laevis oocytes store macromolecules for early development. New genes activate during the midblastula transition and gastrulation, producing stage-specific RNA molecules.

    Area of Science:

    • Developmental biology
    • Molecular biology
    • Xenopus laevis embryogenesis

    Background:

    • Oocytes store maternal factors like poly(A)+ RNA for early embryonic protein synthesis.
    • Gene expression is initially repressed and later activated during early development.

    Purpose of the Study:

    • To investigate macromolecule storage in Xenopus laevis oocytes.
    • To identify genes activated during early embryogenesis, specifically between the midblastula transition and gastrulation.

    Main Methods:

    • Subtractive cDNA cloning was employed to isolate newly activated gene sequences.
    • Analysis of RNA populations at different developmental stages (egg, midblastula transition, gastrulation).

    Main Results:

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  • Poly(A)+ RNA in the egg supports protein synthesis for several hours.
  • Gene activation begins at the midblastula transition, producing various RNA classes.
  • New RNA sequences, absent in the egg, accumulate by gastrulation.

    • Conclusions:

    • Genes activated between the midblastula transition and gastrulation are specific to embryonic and tadpole stages.
    • This study identifies a set of novel embryonic genes in Xenopus laevis.