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Gamete Collection and In Vitro Fertilization of Astyanax mexicanus
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Published on: May 25, 2019

Chapter 8. Evolution and development in the cavefish Astyanax.

William R Jeffery1

  • 1Department of Biology, University of Maryland, College Park, MD, USA.

Current Topics in Developmental Biology
|April 14, 2009
PubMed
Summary
This summary is machine-generated.

The blind cavefish Astyanax mexicanus loses eyes and pigment due to lens apoptosis and a p/oca2 gene mutation, offering insights into evolutionary developmental changes.

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Area of Science:

  • Evolutionary developmental biology
  • Genetics
  • Comparative genomics

Background:

  • Astyanax mexicanus exists as sighted surface-dwelling and blind cave-dwelling forms.
  • These forms share a common ancestor, facilitating genetic analysis and study of evolutionary changes.
  • Cavefish serve as a model organism to investigate the loss of eyes and pigmentation.

Purpose of the Study:

  • To review molecular, cellular, and developmental mechanisms behind eye and pigment loss in Astyanax cavefish.
  • To understand the evolutionary developmental basis for cavefish adaptations.

Main Methods:

  • Review of current research on Astyanax cavefish development.
  • Analysis of genetic mutations affecting pigmentation.
  • Investigation of signaling pathways involved in eye development and degeneration.

Main Results:

  • Eye loss in cavefish results from lens apoptosis, triggered by enhanced Hedgehog signaling.
  • Pigmentation loss is caused by a mutation in the p/oca2 gene, blocking L-tyrosine accumulation in melanosomes.
  • Eye degeneration precedes and influences craniofacial development differences.

Conclusions:

  • Hedgehog signaling and p/oca2 gene mutations are key mechanisms driving cavefish eye and pigment loss.
  • Studies reveal how developmental processes change during evolution in Astyanax mexicanus.
  • Cavefish provide a unique system for studying adaptation and loss of traits.