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Selection on structural allelic variation biases plasticity estimates.

Mauro Santos1, Margarida Matos2, Sheng Pei Wang3

  • 1Departament de Genètica i de Microbiologia, Grup de Genòmica, Bioinformàtica i Biologia Evolutiva (GGBE), Universitat Autònoma de Barcelona, Barcelona, Spain.

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Summary
This summary is machine-generated.

Drosophila melanogaster showed adaptive plasticity in novel environments, but researchers now caution that allele frequency changes may confound results. Further studies should monitor allele frequencies to accurately assess plasticity.

Keywords:
Adh polymorphismDrosophilaethanolphenotypic plasticity

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Environmental adaptation

Background:

  • Drosophila melanogaster's adaptive plasticity in novel environments was previously explored.
  • Alcohol dehydrogenase (ADH) activity and plastic responses were measured across varying ethanol concentrations.

Purpose of the Study:

  • To re-evaluate the adaptive significance of ADH plasticity in Drosophila melanogaster.
  • To address potential confounding factors in plasticity estimation using family designs.

Main Methods:

  • Utilized a full-sib, half-sib design to assess ADH activity and plasticity in Drosophila melanogaster.
  • Measured changes in ADH activity across natural (0-10% ethanol) and novel (16% ethanol) environments.
  • Examined the association between larval viability, ADH activity, and plasticity.

Main Results:

  • ADH activity increased with alcohol concentration, and higher ADH activity correlated with larval viability in the novel environment.
  • Families exhibiting greater plasticity showed increased larval survival, initially suggesting adaptive ADH plasticity.
  • The authors now recognize that allele frequency changes at the Adh locus can confound plasticity estimates.

Conclusions:

  • Initial findings suggested adaptive ADH plasticity, but this conclusion is now questioned.
  • Estimating plasticity from phenotypic differences in family designs can conflate genetic and plastic contributions.
  • Monitoring allele frequency changes is crucial for accurate plasticity assessment in studies lacking replicated genotypes.