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The soft genome.

Sarit Anava1, Rachel Posner1, Oded Rechavi1

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Small RNAs in C. elegans worms can be inherited across generations, offering a flexible inheritance of acquired traits. Starvation triggers this transgenerational RNA inheritance, impacting progeny lifespan and challenging genetic dogma.

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Area of Science:

  • Genetics and Epigenetics
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Small RNAs mediate gene regulation across generations in Caenorhabditis elegans (C. elegans).
  • This transgenerational RNA inheritance allows for "soft" or flexible inheritance of acquired characteristics, distinct from DNA sequence changes.
  • Previously, only foreign genetic material introduction was known to induce heritable small RNA transmission.

Purpose of the Study:

  • To explore the inheritance of endogenous small RNAs triggered by environmental factors like starvation in C. elegans.
  • To investigate the potential for transgenerational RNA interference (RNAi) to regulate broader aspects of worm physiology and traits.
  • To examine how these findings challenge established principles in genetics and evolutionary biology.

Main Methods:

  • Observation of starvation-induced endogenous small RNA inheritance across multiple generations in C. elegans.
  • Assessment of heritable changes in progeny lifespan following parental starvation.
  • Review and commentary on existing literature regarding transgenerational RNAi and its implications.

Main Results:

  • Starvation in C. elegans triggers the inheritance of endogenous small RNAs across multiple generations.
  • Starvation also leads to a heritable extension of lifespan in the offspring.
  • These findings suggest a broader role for small RNA-mediated regulation beyond foreign genetic material.

Conclusions:

  • Environmental stimuli, such as starvation, can induce transgenerational inheritance of endogenous small RNAs in C. elegans.
  • This mechanism provides a flexible inheritance pathway that can influence physiological traits like lifespan.
  • The discoveries in C. elegans necessitate a re-evaluation of fundamental concepts in genetics and evolution regarding inheritance.