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Pattern formation in the Drosophila embryo.

S A Kauffman

    Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
    |October 7, 1981
    PubMed
    Summary
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    Developmental commitments in Drosophila embryos are explored through three hypotheses. Reaction-diffusion models, unlike gradient or combinatorial codes, naturally explain transformations and pattern formation, suggesting a new framework for understanding embryonic development.

    Area of Science:

    • Developmental Biology
    • Genetics
    • Systems Biology

    Background:

    • Three hypotheses explain developmental commitments in Drosophila embryos: localized determinants, gradient models, and combinatorial epigenetic codes.
    • The combinatorial code hypothesis accounts for transdetermination and homoeotic transformations, particularly between distant embryonic regions.
    • Monotonic gradient models struggle to explain transformations between distant regions, unlike reaction-diffusion models.

    Purpose of the Study:

    • To evaluate the validity of three hypotheses regarding developmental commitments in the Drosophila embryo.
    • To assess the explanatory power of reaction-diffusion models for pattern formation and transformations.
    • To critically examine the evidence supporting the combinatorial code hypothesis.

    Main Methods:

    Related Experiment Videos

    • Comparative analysis of three hypotheses: micromosaic determinants, gradient models, and combinatorial epigenetic codes.
    • Evaluation of reaction-diffusion models for explaining observed phenomena like transdetermination and homoeotic transformations.
    • Assessment of current data on compartmental boundaries, gene functions, and mutant phenotypes.

    Main Results:

    • Reaction-diffusion models naturally explain transformations between distant embryonic regions and compartmental boundary geometries.
    • These models predict specific mutant classes, including mirror-symmetric structures, and two-dimensional positional information.
    • No features of the combinatorial code hypothesis have been experimentally verified.

    Conclusions:

    • Reaction-diffusion models offer a more comprehensive explanation for developmental patterning and transformations in Drosophila embryos.
    • The combinatorial code hypothesis, while attractive, lacks empirical support.
    • Further research is needed to validate the mechanisms underlying compartmental boundary formation and gene regulation in developmental commitment.