Evidence map›Paper›PMID 22738726›Full record

ArticleCell2012

piRNAs initiate an epigenetic memory of nonself RNA in the C. elegans germline.

Masaki Shirayama, Meetu Seth, Heng-Chi Lee, Weifeng Gu, Takao Ishidate, Darryl Conte, Craig C Mello

Open access · bronzeAbstract read
In one paragraph

Article in Cell, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 357 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
357citing papers in PubMed, 1 pooled it
24.8field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

357 citing papers in PubMed, 1 synthesis or guideline pooled it, 626 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. DivergenteLife · 2026
    Article
  4. Review
  5. Article
  6. Reproductive phasiRNAs are the piRNAs of plants.Trends in genetics : TIG · 2026
    Review
  7. Article
  8. Review
  9. Genetic heritage of war: exploring transgenerational inheritance of PTSD and its molecular background.Mammalian genome : official journal of the International Mammalian Genome Society · 2026
    Review
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Article

297 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

7 authors at 2 institutions in 1 country.

Masaki ShirayamaProgram in Molecular Medicine, University of Massachusetts Medical School, 373 Plantation Street, Worcester, MA 01605, USA.
Meetu Seth
Heng-Chi Lee
Weifeng Gu
Takao Ishidate
Darryl Conte
Craig C Mello
University of Massachusetts Chan Medical School · USHoward Hughes Medical Institute · US

Funding

RNA MEDIATED GENETIC INTERFERENCE IN C ELEGANSR01GM058800 · NIGMS · UNIV OF MASSACHUSETTS MED SCH WORCESTER · PI MELLO, CRAIG C · 1999 to 2014
$4.6M
RNA Mediated Genetic Interference in C. elegansR37GM058800 · NIGMS · UNIV OF MASSACHUSETTS MED SCH WORCESTER · PI MELLO, CRAIG C · 2015 to 2024
$3.7M
Investigating the Biogenesis and Function of piRNAs in Germline DevelopmentF32GM099372 · NIGMS · UNIV OF MASSACHUSETTS MED SCH WORCESTER · PI LEE, HENG-CHI · 2011 to 2013
$161k
Howard Hughes Medical InstituteNIGMS NIH HHS F32 GM099372NIGMS NIH HHS GM058800NIGMS NIH HHS GM099372NIGMS NIH HHS R01 GM058800NIGMS NIH HHS R37 GM058800
6 · The paper itself

Abstract

Organisms employ a fascinating array of strategies to silence invasive nucleic acids such as transposons and viruses. Although evidence exists for several pathways that detect foreign sequences, including pathways that sense copy number, unpaired DNA, or aberrant RNA (e.g., dsRNA), in many cases, the mechanisms used to distinguish "self" from "nonself" nucleic acids remain mysterious. Here, we describe an RNA-induced epigenetic silencing pathway that permanently silences single-copy transgenes. We show that the Piwi Argonaute PRG-1 and its genomically encoded piRNA cofactors initiate permanent silencing, and maintenance depends on chromatin factors and the WAGO Argonaute pathway. Our findings support a model in which PRG-1 scans for foreign sequences and two other Argonaute pathways serve as epigenetic memories of "self" and "nonself" RNAs. These findings suggest how organisms can utilize RNAi-related mechanisms to detect foreign sequences not by any molecular signature, but by comparing the foreign sequence to a memory of previous gene expression.

Indexed as

EpigenomicsAnimalsArgonaute ProteinsCaenorhabditis elegansCaenorhabditis elegans ProteinsGene SilencingGerm CellsRNA, HelminthRNA InterferenceRNA, Small InterferingArgonaute ProteinsCaenorhabditis elegans ProteinsPRG-1 protein, C elegansRNA, HelminthRNA, Small Interfering

Identifiers

PMID22738726
PMCPMC3597741
OpenAlexW2154222068

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.