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Selection on the epigenome: small RNA inheritance in animal evolution.

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Small RNA (sRNA) inheritance can influence offspring traits, but its role in adaptive evolution remains unclear. This review proposes adaptive strategies and highlights the overlooked impact of natural selection on sRNA inheritance.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Epigenetics

Background:

  • Small RNA (sRNA) inheritance is a widespread phenomenon across taxa.
  • Environmental changes can modify germline sRNAs, potentially influencing offspring phenotypes for evolutionary bet-hedging or adaptive responses.
  • The precise role of sRNA inheritance in adaptive evolution and the mechanisms of selection on sRNAs are not well understood.

Purpose of the Study:

  • To review and outline potential adaptive sRNA inheritance strategies.
  • To discuss non-adaptive alternatives and their evolutionary implications.
  • To highlight the underappreciated role of natural selection in sRNA inheritance.

Main Methods:

  • Literature review and theoretical framework development.
  • Analysis of existing studies on sRNA inheritance and environmental adaptation.
  • Conceptual modeling of adaptive and non-adaptive sRNA inheritance strategies.

Main Results:

  • Two adaptive sRNA inheritance strategies, 'specialist' and 'generalist,' are proposed.
  • Non-adaptive alternatives and their evolutionary consequences are discussed.
  • Evidence suggests natural selection's role in sRNA inheritance may be significantly overlooked.

Conclusions:

  • The evolutionary implications of sRNA inheritance are complex and influenced by natural selection.
  • Overlooking selection's role can lead to misinterpretations of sRNA inheritance mechanisms and outcomes.
  • Further research is needed to elucidate the interplay between natural selection and sRNA inheritance in driving evolutionary adaptation.