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Germ Granules Coordinate RNA-Based Epigenetic Inheritance Pathways.

Anne E Dodson1, Scott Kennedy1

  • 1Department of Genetics, Harvard Medical School, Boston, MA 02115, USA.

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|August 13, 2019
PubMed
Summary
This summary is machine-generated.

Loss of germ granules in C. elegans causes transgenerational defects in RNA interference (RNAi) unrelated to genotype. Aberrant small interfering RNAs (siRNAs) from mutant ancestors disrupt gene silencing for up to 10 generations.

Keywords:
Transgenerational epigenetic inheritanceendo-siRNAgerm granulesnon-Mendelian inheritancenon-coding RNAphase separation

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Area of Science:

  • Developmental Biology
  • Epigenetics
  • Molecular Biology

Background:

  • Germ granules are essential biomolecular condensates that maintain germ cell totipotency.
  • In Caenorhabditis elegans, MEG-3 and MEG-4 proteins are crucial for germ granule assembly in germline cells.

Purpose of the Study:

  • To investigate the role of germ granules in RNA interference (RNAi) and epigenetic inheritance.
  • To determine if defects in germ granule formation lead to transgenerational effects on gene expression and RNAi.

Main Methods:

  • Generated meg-3/4 mutant Caenorhabditis elegans strains lacking functional germ granules.
  • Analyzed RNA interference (RNAi) pathways and small interfering RNA (siRNA) profiles in mutant and wild-type animals across generations.
  • Investigated the heritability of RNAi defects and gene silencing patterns.

Main Results:

  • Meg-3/4 mutant animals displayed significant defects in RNA interference (RNAi) that were inherited by wild-type descendants.
  • These transgenerational RNAi defects were disconnected from the meg-3/4 genotype.
  • Aberrant siRNAs produced by mutant ancestors were propagated for approximately 10 generations, leading to heritable silencing of germline-expressed genes, including the RNAi gene sid-1.

Conclusions:

  • Germ granules play a critical role in organizing RNA-based epigenetic inheritance pathways.
  • Loss of germ granules results in persistent, transgenerational consequences on gene silencing and RNA interference.
  • These findings highlight the importance of germ granules in maintaining epigenetic stability across generations.