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Two Heliconius butterfly species evolved red pattern preferences through hybridization. Gene regucalcin1 disruption impaired courtship, linking genes to visual mate choice behavior and speciation.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Animal behavior

Background:

  • Visual preferences are key drivers of mate choice and sexual selection.
  • The genetic underpinnings of evolving visual preferences remain largely unknown.
  • Heliconius butterflies exhibit diverse warning patterns used in mate selection.

Purpose of the Study:

  • To investigate the genetic basis of visual preferences in Heliconius butterflies.
  • To determine if hybridization plays a role in the evolution of mate choice behaviors.
  • To link specific genes to visual preferences and courtship.

Main Methods:

  • Behavioral assays to assess visual preferences.
  • Population genomic analyses to detect genetic exchange.
  • Gene expression studies and CRISPR-Cas9 gene editing.

Main Results:

  • Two Heliconius species share red pattern preferences due to genetic material exchange via hybridization.
  • Neural expression of regucalcin1 correlates with visual preference across populations.
  • Disruption of regucalcin1 impairs conspecific courtship behavior.

Conclusions:

  • Hybridization can facilitate the evolution of complex behaviors like mate choice.
  • The gene regucalcin1 is directly implicated in visual preference and courtship.
  • Visually guided behaviors contributing to adaptation and speciation are genetically encoded.