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Updated: Jul 7, 2026

Behavioral Tracking and Neuromast Imaging of Mexican Cavefish
14:58

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Published on: April 6, 2019

Multi-trait evolution in a cave fish, Astyanax mexicanus.

Meredith Protas1, Inna Tabansky, Melissa Conrad

  • 1Department of Genetics, Harvard Medical School, Boston, MA, USA.

Evolution & Development
|March 5, 2008
PubMed
Summary

Evolutionary genetics reveals that cavefish traits cluster in the genome. Quantitative trait loci (QTL) mapping suggests pleiotropic alleles, where single genes influence multiple traits, drive convergent evolution in cave-dwelling species.

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Area of Science:

  • Evolutionary Genetics
  • Speciation
  • Genomics

Background:

  • Surface-dwelling species colonizing caves exhibit convergent evolution, developing similar traits regardless of lineage.
  • Understanding the genetic underpinnings of these consistent phenotypic changes is crucial for evolutionary biology.

Purpose of the Study:

  • To investigate the genetic basis of convergent evolution in Mexican cave tetra (Astyanax mexicanus).
  • To identify genomic regions responsible for a suite of 12 divergent traits between surface and cave populations.

Main Methods:

  • Employed quantitative trait loci (QTL) mapping using both single- and multi-trait models.
  • Analyzed 12 ecologically and morphologically relevant traits, including eye size, pigment, and metabolism.
  • Examined genetic variation in a recently evolved cave-dwelling population (<1 million years old).

Main Results:

  • Identified 13 significant genomic regions containing QTLs affecting three to nine traits.
  • Observed significant clustering of QTL effects across the genome, indicating non-random distribution.
  • Some QTL clusters exhibited counterintuitive substitution effects, suggesting complex genetic architecture.

Conclusions:

  • Genomic clusters of QTLs are a key feature in the rapid evolution of cave adaptation.
  • Evidence strongly suggests that pleiotropy, where single genes influence multiple traits, underlies at least some of these trait clusters.
  • This genetic architecture facilitates rapid and predictable phenotypic evolution in response to environmental change.