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Updated: Jun 24, 2026

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The phytoestrogen genistein affects zebrafish development through two different pathways.

Sana Sassi-Messai1, Yann Gibert, Laure Bernard

  • 1Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Lyon 1, CNRS, INRA, Ecole Normale Supérieure de Lyon, Lyon, France.

Plos One
|March 26, 2009
PubMed
Summary

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Genistein, a soy phytoestrogen, triggers apoptosis in zebrafish embryos independently of estrogen receptors (ERs). It also regulates aromatase-B gene expression in the brain via an ER-dependent pathway, revealing multiple actions.

Area of Science:

  • Endocrinology
  • Developmental Biology
  • Toxicology

Background:

  • Endocrine disrupting chemicals (EDCs) are prevalent environmental contaminants.
  • Genistein, a soy-derived phytoestrogen, exhibits known estrogenic activity.
  • Understanding genistein's effects is crucial due to its widespread exposure.

Purpose of the Study:

  • To investigate the mechanisms of genistein's action in zebrafish embryos.
  • To determine if genistein's effects are mediated through estrogen receptors (ERs).
  • To explore the dual pathways of genistein's biological activity.

Main Methods:

  • Exposure of zebrafish embryos to genistein.
  • Apoptosis assays and timing experiments.
  • In vitro and in vivo ER binding and activation assays.

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  • Analysis of aromatase-B gene expression.

    • Main Results:

    • Genistein induced apoptosis in zebrafish embryos, particularly in the hindbrain and spinal cord, in an ER-independent manner.
    • Genistein binds and activates zebrafish ERalpha, ERbeta-A, and ERbeta-B in vitro.
    • Genistein activated the estrogen pathway in vivo and induced aromatase-B expression in an ER-dependent manner in the brain.

    Conclusions:

    • Genistein exerts dual effects in zebrafish embryos: ER-independent apoptosis and ER-dependent regulation of aromatase-B.
    • Phytoestrogens like genistein possess diverse biological actions.
    • Standardized testing may miss complex effects of compounds with known targets.