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Assessing Teratogenic Changes in a Zebrafish Model of Fetal Alcohol Exposure
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Preventing Ethanol-Induced Brain and Eye Morphology Defects Using Optogenetics.

Vaibhav P Pai1, Dany Spencer Adams2,3

  • 1Department of Biology, Tufts Center for Regenerative and Developmental Biology, Tufts University, Medford, Massachusetts.

Bioelectricity
|July 21, 2020
PubMed
Summary

Modulating embryonic membrane voltage can rescue ethanol-induced brain and eye defects, offering a potential treatment for fetal alcohol spectrum disorder (FASD) birth defects.

Keywords:
Xenopusbioelectricitybraincraniofacial developmenteyefetal alcohol spectrum disorderoptogenetics

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Genetics

Background:

  • Ethanol exposure during embryonic development causes birth defects, including brain and eye abnormalities, characteristic of fetal alcohol spectrum disorder (FASD).
  • Bioelectric signals, specifically membrane voltage variations, are crucial for regulating embryonic cell behaviors essential for proper brain and eye development.
  • Disruptions in these bioelectric patterns can lead to correlated defects in gene expression and morphology.

Purpose of the Study:

  • To investigate whether controlled membrane voltage modulation can rescue ethanol-induced brain and eye defects in *Xenopus laevis* embryos.
  • To determine the critical timing, location, and duration of voltage modulation required for rescue.
  • To explore the potential of bioelectric modulation as a therapeutic strategy for FASD-related birth defects.

Main Methods:

  • Utilized *Xenopus laevis* embryos exposed to ethanol to model FASD-related developmental defects.
  • Employed light-activated channelrhodopsin-2 (D156A variant) to precisely modulate embryonic membrane voltage.
  • Assessed rescue of brain and eye morphology through controlled hyperpolarization of specific embryonic tissues.

Main Results:

  • Light-activated membrane voltage modulation successfully rescued ethanol-induced brain and eye dysmorphologies in *Xenopus* embryos.
  • Sustained hyperpolarization throughout the ethanol exposure period was necessary for complete rescue.
  • Hyperpolarization of superficial ectoderm alone was sufficient to rescue defects, indicating a long-range effect.
  • The rescue effect demonstrated action at a distance, suggesting systemic bioelectric regulation.

Conclusions:

  • Controlled bioelectric modulation, specifically hyperpolarization, can effectively rescue ethanol-induced developmental defects in the brain and eyes.
  • These findings suggest a novel therapeutic avenue for treating FASD-related birth defects using bioelectric interventions.
  • The potential application of existing ion channel drugs offers a promising, cost-effective strategy to mitigate the impact of FASD.