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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Genes controlling mimetic colour pattern variation in butterflies.

Nicola J Nadeau1

  • 1Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield S10 2TN, UK.

Current Opinion in Insect Science
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PubMed
Summary

Butterfly wing patterns are controlled by genetic toolkits. While Heliconius butterflies utilize a conserved set of genes, Papilio species exhibit diverse genetic mechanisms for their varied wing patterns.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Ecology

Background:

  • Butterfly wing patterns are complex traits crucial for survival, particularly in mimetic species.
  • Within-species variation in wing patterns is common in the genera Heliconius and Papilio.
  • These genera engage in mimicry, enhancing predator protection.

Purpose of the Study:

  • To investigate the molecular genetic basis of wing pattern variation in Heliconius and Papilio.
  • To compare the genetic mechanisms underlying mimicry and polymorphism in these genera.

Main Methods:

  • Molecular genetic analysis of wing pattern traits.
  • Comparative genomics across different species and genera.

Main Results:

  • Heliconius butterflies possess a conserved 'genetic toolkit' of five loci controlling color patterns, with three identified at the gene level.
  • Different Papilio species employ distinct genetic mechanisms to regulate their polymorphic wing patterns.
  • The repeated use of similar genetic loci across Heliconius species highlights convergent evolution in pattern modification.

Conclusions:

  • Genetic mechanisms for wing pattern evolution differ significantly between Heliconius and Papilio.
  • Heliconius demonstrates a more constrained, shared genetic architecture for pattern evolution compared to the diverse strategies in Papilio.