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Related Experiment Video

Updated: May 22, 2026

Assessing Teratogenic Changes in a Zebrafish Model of Fetal Alcohol Exposure
10:07

Assessing Teratogenic Changes in a Zebrafish Model of Fetal Alcohol Exposure

Published on: March 20, 2012

Arsenic impairs embryo development via down-regulating Dvr1 expression in zebrafish.

Xiaoqiao Li1, Yan Ma, Dan Li

  • 1Graduate School of Peking Union Medical College, Beijing, China.

Toxicology Letters
|May 23, 2012
PubMed
Summary

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Arsenic exposure harms zebrafish development by down-regulating Dvr1, a gene crucial for left-right axis formation. Restoring Dvr1 levels can reverse these toxic effects, revealing a key mechanism in arsenic embryo toxicity.

Area of Science:

  • Developmental Biology
  • Toxicology
  • Molecular Biology

Background:

  • Environmental inorganic arsenic exposure causes significant human health issues, including cancer and cardiovascular disease.
  • Previous research indicated arsenic exposure induces developmental toxicity in zebrafish embryos, affecting cardiac and neural systems.
  • The precise molecular mechanisms underlying arsenic-induced developmental toxicity remain largely unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms of arsenic-mediated developmental toxicity in zebrafish embryos.
  • To identify specific genes and pathways involved in arsenic-induced developmental defects.
  • To elucidate the role of Dvr1 in arsenic toxicity and embryonic development.

Main Methods:

  • Real-time quantitative RT-PCR to measure gene expression levels.

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  • Whole-mount in situ hybridization to visualize gene expression patterns.
  • Antisense morpholino knockdown and gene overexpression techniques in zebrafish embryos.

    • Main Results:

    • Arsenite exposure significantly down-regulated zebrafish Dvr1 expression.
    • Dvr1 knockdown in embryos mimicked arsenic-induced developmental anomalies, including pericardium edema and failed looping.
    • Overexpression of GDF1 (a homolog of Dvr1) rescued developmental defects caused by both morpholino and arsenite.

    Conclusions:

    • Zebrafish Dvr1 is essential for establishing left-right asymmetry during embryonic development.
    • Dvr1 plays a critical role in mediating arsenic-induced embryo toxicity.
    • These findings offer novel insights into the molecular mechanisms of arsenic toxicity during early development.