Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0005634 nucleus	IBA GO_REF:0000033	REMOVE	Summary: IBA annotation based on phylogenetic inference from other Argonaute family members. While some Argonaute proteins do localize to the nucleus, the primary literature for WAGO-1 specifically demonstrates cytoplasmic P granule localization in the germline (PMID:19800275, PMID:24684931). UniProt annotation describes WAGO-1 subcellular location as "Cytoplasmic granule" with no nuclear localization reported. Reason: WAGO-1 has been experimentally characterized as localizing to cytoplasmic P granules (PMID:19800275). The nuclear annotation appears to be an over-generalization from other Argonaute family members. WAGO-1 functions in cytoplasmic post-transcriptional gene silencing and there is no direct evidence for nuclear localization in C. elegans. Supporting Evidence: PMID:19800275 We show that, in the germline, one system is dependent on worm-specific AGOs, including WAGO-1, which localizes to germline nuage structures called P granules PMID:24684931 RDE-12 colocalizes with WAGO-1 in germline P granules and in cytoplasmic and perinuclear foci in somatic cells file:worm/wago-1/wago-1-deep-research-falcon.md the best-supported assignment is WAGO-1 as primarily a cytoplasmic/perinuclear post-transcriptional effector within the WAGO 22G-RNA surveillance pathway
GO:0005737 cytoplasm	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for cytoplasmic localization is broadly consistent with experimental evidence showing WAGO-1 in cytoplasmic P granules. However, the more specific term GO:0043186 (P granule) is preferable as it captures the precise subcellular localization. Reason: Cytoplasmic localization is accurate - WAGO-1 localizes to cytoplasmic P granules (PMID:19800275, PMID:24684931). This is a valid parent term for the more specific P granule localization. Retaining as it provides broader context. Supporting Evidence: PMID:19800275 We show that, in the germline, one system is dependent on worm-specific AGOs, including WAGO-1, which localizes to germline nuage structures called P granules file:worm/wago-1/wago-1-deep-research-falcon.md WAGO-1 is consistently described as a cytoplasmic/perinuclear germ-granule Argonaute (P-granule localized)
GO:0004521 RNA endonuclease activity	IBA GO_REF:0000033	REMOVE	Summary: This annotation is phylogenetically inferred from slicer-competent Argonaute proteins. However, WAGO subfamily Argonautes specifically lack the conserved metal-binding residues (DDH/DDX catalytic tetrad) required for endonuclease activity. UniProt explicitly notes that WAGO subfamily members lack conserved metal-binding residues and probably do not cleave target mRNAs directly (PMID:17110334). Reason: WAGO-1 lacks the catalytic tetrad required for RNA endonuclease (slicer) activity. This is a known distinguishing feature of the WAGO subfamily. The protein likely recruits other endonucleases for target degradation rather than performing cleavage itself. This annotation is an over-annotation based on ancestral function that has been lost in this subfamily. Supporting Evidence: PMID:17110334 these AGO proteins lack key residues required for mRNA cleavage file:worm/wago-1/wago-1-deep-research-falcon.md WAGO-family Argonautes were reported to lack the catalytic residues required for Slicer activity, implying WAGO-mediated silencing often occurs via cleavage-independent mechanisms
GO:0035194 regulatory ncRNA-mediated post-transcriptional gene silencing	IBA GO_REF:0000033	ACCEPT	Summary: WAGO-1 is a central effector in the 22G-RNA pathway, which is a form of endo-siRNA-mediated gene silencing. The protein binds 22G-RNAs and mediates silencing of transposons, pseudogenes, and aberrant transcripts in the germline (PMID:19800275). This is a core function of WAGO-1. Reason: This annotation accurately captures WAGO-1's primary biological function. WAGO-1 participates in a regulatory ncRNA-mediated silencing pathway using endogenous 22G-RNAs. Experimental evidence from PMID:19800275 demonstrates this function directly. Supporting Evidence: PMID:19800275 WAGO-1 silences certain genes, transposons, pseudogenes, and cryptic loci file:worm/wago-1/wago-1-deep-research-falcon.md WAGO-1 is an Argonaute effector that binds secondary 22G-RNAs and mediates germline silencing / genome surveillance of targets including transposons, pseudogenes, and cryptic loci**
GO:0016442 RISC complex	IBA GO_REF:0000033	ACCEPT	Summary: As an Argonaute protein that binds small RNAs and mediates gene silencing, WAGO-1 functions as part of an RNA-induced silencing complex. While the worm-specific WAGO-1-containing complex may have distinct features, RISC complex is an appropriate general term for Argonaute-containing silencing effector complexes. Reason: WAGO-1 is the core Argonaute component of a small RNA-mediated silencing complex. It associates with 22G-RNAs and interacts with RDE-12 (PMID:24684931) and ZNFX-1 (PMID:29775580) as part of the silencing machinery. RISC complex appropriately describes this functional complex. Supporting Evidence: PMID:24684931 RDE-12 forms an RNase-resistant (target mRNA-independent) complex with WAGO-1 PMID:17110334 several other AGO proteins interact with amplified siRNAs to mediate downstream silencing file:worm/wago-1/wago-1-deep-research-falcon.md RdRP-produced 22G-RNAs can be loaded onto WAGOs “without Dicer” processing
GO:0036464 cytoplasmic ribonucleoprotein granule	IBA GO_REF:0000033	ACCEPT	Summary: P granules are a type of cytoplasmic ribonucleoprotein granule. WAGO-1 has been directly demonstrated to localize to P granules (PMID:19800275). This term is appropriate as a parent term, though the more specific GO:0043186 (P granule) is also annotated with experimental evidence. Reason: This is a valid broader annotation. P granules are cytoplasmic ribonucleoprotein granules, and WAGO-1 localizes to P granules (PMID:19800275, PMID:24684931). The IBA annotation is consistent with experimental data. Supporting Evidence: PMID:19800275 We show that, in the germline, one system is dependent on worm-specific AGOs, including WAGO-1, which localizes to germline nuage structures called P granules file:worm/wago-1/wago-1-deep-research-falcon.md Germ granules are perinuclear, RNA-rich, membrane-less condensates at the cytoplasmic face of germline nuclei
GO:0035198 miRNA binding	IBA GO_REF:0000033	MODIFY	Summary: This annotation is phylogenetically inferred from miRNA-binding Argonautes. However, WAGO-1 specifically binds 22G-RNAs (endogenous siRNAs), not miRNAs. The 22G-RNA pathway is distinct from the miRNA pathway in C. elegans. WAGO-1 binds secondary siRNAs produced by RNA-dependent RNA polymerases, which are structurally and functionally distinct from miRNAs. Reason: WAGO-1 binds 22G-RNAs (endogenous siRNAs), not miRNAs. The miRNA binding annotation is an over-generalization from other Argonaute family members. The appropriate term is siRNA binding (GO:0035197), which accurately describes binding to the 21-23 nt small interfering RNAs that WAGO-1 associates with. Proposed replacements: siRNA binding Supporting Evidence: PMID:17110334 several other AGO proteins interact with amplified siRNAs to mediate downstream silencing file:worm/wago-1/wago-1-deep-research-falcon.md WAGO-1 associates with 22G-RNAs: Gu et al. show transposon 22G-RNAs are enriched in WAGO-1 immunoprecipitation samples
GO:0003727 single-stranded RNA binding	IBA GO_REF:0000033	ACCEPT	Summary: Argonaute proteins bind single-stranded guide RNAs. WAGO-1 binds 22G-RNAs in their single-stranded form after processing. This is a valid general molecular function annotation for an Argonaute protein. Reason: WAGO-1 binds single-stranded 22G-RNAs as guide RNAs for target recognition. This is a core molecular function of Argonaute proteins. The annotation is appropriate though more specific terms like siRNA binding would also be accurate. Supporting Evidence: PMID:17110334 Argonaute (AGO) proteins interact with small RNAs to mediate gene silencing file:worm/wago-1/wago-1-deep-research-falcon.md 22G-RNAs are ~22-nt small RNAs with a strong 5′ guanosine (5′G) bias
GO:0003676 nucleic acid binding	IEA GO_REF:0000002	ACCEPT	Summary: IEA annotation based on InterPro domains (PAZ and Piwi domains). This is a very broad term that is subsumed by more specific RNA binding annotations. While technically correct, it provides little informative value given the more specific annotations. Reason: This is a valid but very general annotation based on domain composition. The PAZ and Piwi domains are nucleic acid binding domains. More specific annotations (RNA binding, siRNA binding) are also present and more informative.
GO:0003723 RNA binding	IEA GO_REF:0000002	ACCEPT	Summary: IEA annotation based on InterPro PAZ domain (IPR003100). WAGO-1 contains PAZ and Piwi domains characteristic of Argonaute proteins that bind small RNAs. This is a valid general annotation. Reason: WAGO-1 binds 22G-RNAs through its PAZ and Piwi domains. RNA binding is a core molecular function. This annotation is appropriate as a broader classification of the siRNA binding activity.
GO:0031047 regulatory ncRNA-mediated gene silencing	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation based on UniProtKB keyword mapping (RNA-mediated gene silencing). This term encompasses both transcriptional and post-transcriptional silencing. WAGO-1 primarily functions in post-transcriptional silencing (GO:0035194), which is a child term already annotated. Reason: This is a valid parent term for the more specific post-transcriptional silencing annotation. WAGO-1 is involved in regulatory ncRNA-mediated gene silencing using 22G-RNAs. Both this term and the more specific GO:0035194 are appropriate. Supporting Evidence: file:worm/wago-1/wago-1-deep-research-falcon.md Gu et al. describe WAGO-1 as part of a germline 22G-RNA genome surveillance pathway, mediating silencing of transposons and other aberrant/cryptic loci
GO:0017151 DEAD/H-box RNA helicase binding	IPI PMID:24684931 The Vasa Homolog RDE-12 engages target mRNA and multiple arg...	ACCEPT	Summary: This annotation is based on the physical interaction between WAGO-1 and RDE-12, a Vasa homolog DEAD-box RNA helicase. PMID:24684931 identified RDE-12 as a robust interaction partner of WAGO-1 through immunoprecipitation studies. RDE-12 is required for secondary siRNA production and colocalizes with WAGO-1 in P granules. Reason: This is a well-supported experimental annotation. PMID:24684931 directly demonstrated physical interaction between WAGO-1 and RDE-12 (P90897), a DEAD-box RNA helicase. This interaction is functionally important for RNAi and endo-siRNA pathways. Supporting Evidence: PMID:24684931 These studies identified a robust association between WAGO-1 and a conserved Vasa ATPase-related protein RDE-12 PMID:24684931 RDE-12 colocalizes with WAGO-1 in germline P granules and in cytoplasmic and perinuclear foci in somatic cells
GO:0043186 P granule	IDA PMID:19800275 Distinct argonaute-mediated 22G-RNA pathways direct genome s...	ACCEPT	Summary: This is a direct experimental annotation showing WAGO-1 localization to P granules. PMID:19800275 demonstrated that WAGO-1 localizes to germline nuage structures called P granules. This is a key finding that establishes the subcellular context for WAGO-1 function in germline gene silencing. Reason: Direct experimental evidence (IDA) demonstrating P granule localization. This is a core cellular component annotation supported by primary literature. P granule localization is essential for WAGO-1's function in germline surveillance. Supporting Evidence: PMID:19800275 We show that, in the germline, one system is dependent on worm-specific AGOs, including WAGO-1, which localizes to germline nuage structures called P granules PMID:24684931 RDE-12 colocalizes with WAGO-1 in germline P granules and in cytoplasmic and perinuclear foci in somatic cells file:worm/wago-1/wago-1-deep-research-falcon.md Chen et al. (2024) explicitly list “P granule localized CSR-1 and WAGO-1” in the context of germ granule subcompartment architecture
GO:0035197 siRNA binding	IDA PMID:19800275 Distinct argonaute-mediated 22G-RNA pathways direct genome s...	NEW	Summary: WAGO-1 specifically binds 22G-RNAs, which are endogenous siRNAs. This binding activity is central to WAGO-1's function and is directly demonstrated in PMID:19800275. Reason: WAGO-1 binds 22G-RNAs (endogenous siRNAs). This is a more accurate molecular function annotation than miRNA binding, which was incorrectly inferred phylogenetically. 22G-RNAs are siRNAs by definition - 22 nucleotide small RNAs processed by RdRP. Supporting Evidence: PMID:17110334 several other AGO proteins interact with amplified siRNAs to mediate downstream silencing file:worm/wago-1/wago-1-deep-research-falcon.md WAGO-1 is classified within the 22G-RNA-binding WAGO group/cluster
GO:0010526 transposable element silencing	IMP PMID:19800275 Distinct argonaute-mediated 22G-RNA pathways direct genome s...	NEW	Summary: WAGO-1 functions in silencing transposons as part of the germline genome surveillance system. This is a key biological process function demonstrated in PMID:19800275. Reason: Transposon silencing is a primary function of the WAGO-1 22G-RNA pathway in the germline. This should be annotated as a core biological process function. Supporting Evidence: PMID:19800275 WAGO-1 silences certain genes, transposons, pseudogenes, and cryptic loci file:worm/wago-1/wago-1-deep-research-falcon.md together with related silencing WAGOs (including PPW-2/WAGO-3 and HRDE-1/WAGO-9) that preferentially target silenced germline genes, pseudogenes, and repetitive/transposable elements

Core Functions

WAGO-1 binds 22G-RNAs (endogenous siRNAs) and functions as a core effector in post-transcriptional gene silencing of transposons and aberrant transcripts in the C. elegans germline.

Molecular Function:

siRNA binding

Directly Involved In:

regulatory ncRNA-mediated post-transcriptional gene silencing transposable element silencing

Cellular Locations:

P granule

In Complex:

RISC complex

Supporting Evidence:

PMID:19800275
WAGO-1 silences certain genes, transposons, pseudogenes, and cryptic loci
file:worm/wago-1/wago-1-deep-research-falcon.md
The core function supported by evidence is that **WAGO-1 is an Argonaute effector** that binds **secondary 22G-RNAs** and mediates **germline silencing / genome surveillance** of targets including **transposons, pseudogenes, and cryptic loci**

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

InterPro PAZ domain (IPR003100) predicts RNA binding
InterPro Piwi domain (IPR003165) predicts nucleic acid binding

GO_REF:0000033

Annotation inferences using phylogenetic trees

Phylogenetic inference from Argonaute family members
Some inferred functions may not apply to WAGO subfamily due to loss of catalytic residues

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

RNA-mediated gene silencing keyword mapped to GO terms

PMID:19800275

Distinct argonaute-mediated 22G-RNA pathways direct genome surveillance in the C. elegans germline.

WAGO-1 localizes to P granules in the germline

"We show that, in the germline, one system is dependent on worm-specific AGOs, including WAGO-1, which localizes to germline nuage structures called P granules"
WAGO-1 binds 22G-RNAs (secondary siRNAs)

"Endogenous small RNAs (endo-siRNAs) interact with Argonaute (AGO) proteins to mediate sequence-specific regulation of diverse biological processes"
WAGO-1 silences transposons, pseudogenes, and cryptic loci

"WAGO-1 silences certain genes, transposons, pseudogenes, and cryptic loci"
WAGO-1 is part of a genome surveillance system distinct from CSR-1 pathway

"We show that, in the germline, one system is dependent on worm-specific AGOs, including WAGO-1"
DRH-3 is required for 22G-RNA biogenesis

"DRH-3 is a core component of RNA-dependent RNA polymerase (RdRP) complexes essential for several distinct 22G-RNA systems"

PMID:24684931

The Vasa Homolog RDE-12 engages target mRNA and multiple argonaute proteins to promote RNAi in C. elegans.

WAGO-1 physically interacts with RDE-12 (Vasa homolog DEAD-box helicase)

"These studies identified a robust association between WAGO-1 and a conserved Vasa ATPase-related protein RDE-12"
RDE-12 colocalizes with WAGO-1 in P granules

"RDE-12 colocalizes with WAGO-1 in germline P granules and in cytoplasmic and perinuclear foci in somatic cells"
RDE-12 is required for secondary siRNA production

"rde-12 mutants are deficient in RNAi, including viral suppression, and fail to produce amplified secondary siRNAs and certain endogenous siRNAs (endo-siRNAs)"
RDE-12 forms RNase-resistant complex with WAGO-1

"RDE-12 forms an RNase-resistant (target mRNA-independent) complex with WAGO-1"

PMID:17110334

Analysis of the C. elegans Argonaute family reveals that distinct Argonautes act sequentially during RNAi.

WAGO subfamily Argonautes lack conserved metal-binding residues

"these AGO proteins lack key residues required for mRNA cleavage"
WAGO proteins probably do not cleave target mRNAs directly

"these AGO proteins lack key residues required for mRNA cleavage"
Distinct Argonautes act sequentially in RNAi pathway

"functionally and structurally distinct AGOs act sequentially to direct gene silencing"

PMID:29775580

ZNFX-1 Functions within Perinuclear Nuage to Balance Epigenetic Signals.

WAGO-1 interacts with ZNFX-1
ZNFX-1 functions in perinuclear nuage for epigenetic regulation

file:worm/wago-1/wago-1-deep-research-falcon.md

Falcon deep research report for C. elegans wago-1 (Q21770)

WAGO-1 is a worm-specific Argonaute (WAGO clade) that binds 22G-RNAs and acts as a cytoplasmic/perinuclear post-transcriptional effector in germline genome surveillance, consistent with the slicer-independent (non-catalytic) nature of WAGO-clade Argonautes.

"the best-supported assignment is **WAGO-1 as primarily a cytoplasmic/perinuclear post-transcriptional effector** within the WAGO 22G-RNA surveillance pathway"
WAGO-1 is classified within the 22G-RNA-binding WAGO group, together with silencing WAGOs (PPW-2/WAGO-3, HRDE-1/WAGO-9) that target silenced germline genes, pseudogenes, and repetitive/transposable elements.

"**WAGO-1** is classified within the **22G-RNA-binding WAGO group/cluster**, together with related silencing WAGOs (including PPW-2/WAGO-3 and HRDE-1/WAGO-9) that preferentially target **silenced germline genes, pseudogenes, and repetitive/transposable elements**"
WAGO-clade Argonautes lack the catalytic residues required for Slicer activity, so WAGO-1-mediated silencing occurs via cleavage-independent mechanisms (e.g., recruitment of RNA decay/silencing factors), supporting removal of intrinsic RNA endonuclease activity.

"WAGO-family Argonautes were reported to **lack the catalytic residues required for Slicer activity**, implying WAGO-mediated silencing often occurs via **cleavage-independent mechanisms**"
22G-RNAs are ~22-nt secondary siRNAs with a strong 5' guanosine bias, produced by RNA-dependent RNA polymerases and loaded onto WAGOs without Dicer processing.

"RdRP-produced 22G-RNAs can be loaded onto WAGOs “**without Dicer**” processing"
Transposon 22G-RNAs are enriched in WAGO-1 immunoprecipitation, and 22G-RNA biogenesis depends on a core module including DRH-3 and RdRPs (RRF-1/EGO-1) and EKL-1.

"Gu et al. show **transposon 22G-RNAs** are enriched in **WAGO-1 immunoprecipitation** samples"
WAGO-1 localizes to perinuclear germ granules, specifically P granules; Chen et al. (2024) explicitly position P-granule-localized CSR-1 and WAGO-1 within germ granule subcompartments.

"Chen et al. (2024) explicitly list **“P granule localized CSR-1 and WAGO-1”** in the context of germ granule subcompartment architecture"
WAGO-1 acts downstream of piRNA targeting: piRNA binding initiates secondary WAGO 22G-RNA production, with heritable nuclear silencing executed mainly by HRDE-1 rather than WAGO-1.

"piRNA binding initiates secondary WAGO 22G-RNA production"

Suggested Experiments

Experiment: Identify nucleases recruited by WAGO-1 for target degradation using proximity labeling or co-IP followed by mass spectrometry

Hypothesis: WAGO-1 recruits specific endonucleases to P granules for target mRNA cleavage since it lacks intrinsic slicer activity

Experiment: Determine the complete catalog of WAGO-1 22G-RNA targets using CLIP-seq or similar approaches

Hypothesis: WAGO-1 targets a defined set of transposons, pseudogenes, and cryptic loci distinct from CSR-1 targets

Experiment: Test whether WAGO-1 has any role in chromatin-level silencing using ChIP-seq for silencing-associated histone marks in wago-1 mutants

Hypothesis: WAGO-1 may indirectly influence heterochromatin formation through its interaction with ZNFX-1 and nuclear Argonautes like HRDE-1

Deep Research

Falcon

(wago-1-deep-research-falcon.md)

Research report: *C. elegans* **wago-1** (UniProt Q21770; ORF R06C7.1) functional annotation Falcon Edison Scientific Literature 24 citations 1 artifacts 2026-05-31T17:39:34.494969

## Context ID: pqac-00000038 Figure 8e (page 13) provides a working model of the C. elegans germ granule subcompartments. It specifically labels the P granule ( (image/png)

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Research report: C. elegans wago-1 (UniProt Q21770; ORF R06C7.1) functional annotation

0) Target verification (mandatory)

The evidence base used here consistently refers to Caenorhabditis elegans WAGO-1, a worm-specific Argonaute (WAGO clade) that binds 22G-RNAs and functions in germline silencing pathways, matching the UniProt Q21770 description of an Argonaute-family protein with PAZ/PIWI architecture (seroussi2023acomprehensivesurvey pages 2-3, gu2009distinctargonautemediated22grna pages 1-2, chen2024germgranulecompartments pages 1-2).

1) Key concepts and definitions (current understanding)

1.1 Argonautes and WAGOs

Argonaute (AGO) proteins bind small RNAs and use them as guides to recognize complementary RNAs, enabling gene regulation and genome defense. In C. elegans, the AGO family is expanded and includes worm-specific Argonautes (WAGOs) that primarily act with endogenous secondary siRNAs (seroussi2023acomprehensivesurvey pages 2-3, seroussi2023acomprehensivesurvey pages 23-24).

WAGO-1 is classified within the 22G-RNA-binding WAGO group/cluster, together with related silencing WAGOs (including PPW-2/WAGO-3 and HRDE-1/WAGO-9) that preferentially target silenced germline genes, pseudogenes, and repetitive/transposable elements (seroussi2023acomprehensivesurvey pages 23-24).

1.2 22G-RNAs (secondary siRNAs)

22G-RNAs are ~22-nt small RNAs with a strong 5′ guanosine (5′G) bias; in C. elegans they are largely produced by RNA-dependent RNA polymerases (RdRPs) rather than Dicer, and can be generated as 5′ triphosphorylated RNAs (gu2009distinctargonautemediated22grna pages 1-2, seroussi2023acomprehensivesurvey pages 23-24).

Gu et al. established that RdRP-produced 22G-RNAs can be loaded onto WAGOs “without Dicer” processing (gu2009distinctargonautemediated22grna pages 1-2). Seroussi et al. further emphasize the triphosphorylated nature of 22G-RNAs and that WAGOs preferentially bind triphosphorylated nucleotides, supporting biochemical sorting of small RNAs to WAGOs (seroussi2023acomprehensivesurvey pages 23-24).

1.3 Germ granules (perinuclear condensates) and surveillance

Germ granules are perinuclear, RNA-rich, membrane-less condensates at the cytoplasmic face of germline nuclei. They are compartmentalized into multiple subdomains (e.g., P granules, Mutator foci, Z granules, SIMR foci, and newly described subcompartments) that organize small-RNA pathways (chen2024germgranulecompartments pages 1-2).

2) Molecular function of WAGO-1 (primary function, mechanism, substrates)

2.1 Primary function

The core function supported by evidence is that WAGO-1 is an Argonaute effector that binds secondary 22G-RNAs and mediates germline silencing / genome surveillance of targets including transposons, pseudogenes, and cryptic loci, as well as subsets of genes (gu2009distinctargonautemediated22grna pages 1-2, gu2009distinctargonautemediated22grna pages 7-8).

2.2 Small-RNA partners and their biogenesis module

WAGO-1 associates with 22G-RNAs: Gu et al. show transposon 22G-RNAs are enriched in WAGO-1 immunoprecipitation samples (gu2009distinctargonautemediated22grna pages 7-8). 22G-RNA biogenesis depends on a core module including DRH-3 and RdRPs (notably RRF-1 and/or EGO-1) and EKL-1 (gu2009distinctargonautemediated22grna pages 1-2, gu2009distinctargonautemediated22grna pages 7-8). Loss of these factors eliminates many 22G-RNAs and derepresses loci that normally have high 22G-RNA levels, linking the 22G-RNA system to silencing outputs (gu2009distinctargonautemediated22grna pages 7-8).

2.3 Enzymatic activity (slicer vs non-slicer)

WAGO-family Argonautes were reported to lack the catalytic residues required for Slicer activity, implying WAGO-mediated silencing often occurs via cleavage-independent mechanisms (e.g., recruiting other RNA decay/silencing factors) rather than direct endonucleolytic cleavage by the Argonaute itself (gu2009distinctargonautemediated22grna pages 10-11). Consistent with this, Gu et al. connect at least one WAGO surveillance pathway to nonsense-mediated decay (NMD) components, supporting a model where WAGO-1 can act in post-transcriptional surveillance/decay systems (gu2009distinctargonautemediated22grna pages 1-2).

2.4 Post-transcriptional vs nuclear silencing

Evidence distinguishes cytoplasmic/post-transcriptional WAGO function from nuclear silencing by specialized nuclear Argonautes. WAGO-1 is consistently described as a cytoplasmic/perinuclear germ-granule Argonaute (P-granule localized) (chen2024germgranulecompartments pages 1-2, gu2009distinctargonautemediated22grna pages 1-2). Nuclear co-transcriptional or heritable silencing is typically associated with nuclear WAGOs such as HRDE-1 (WAGO-9) and NRDE-3 (WAGO-12) (gu2009distinctargonautemediated22grna pages 10-11, weiser2019multigenerationalregulationof pages 3-4). Thus, the best-supported assignment is WAGO-1 as primarily a cytoplasmic/perinuclear post-transcriptional effector within the WAGO 22G-RNA surveillance pathway (chen2026decodingargonautespecificity pages 47-49, gu2009distinctargonautemediated22grna pages 1-2).

3) Subcellular localization and where WAGO-1 acts

3.1 P-granule / perinuclear localization

Multiple sources place WAGO-1 at perinuclear germ granules, particularly P granules:
- Gu et al. report WAGO-1 localizes to P granules (germ-line nuage) (gu2009distinctargonautemediated22grna pages 1-2).
- Chen et al. (2024) explicitly list “P granule localized CSR-1 and WAGO-1” in the context of germ granule subcompartment architecture (chen2024germgranulecompartments pages 1-2), visually supported by their working model figure depicting WAGO-1 in the P granule (chen2024germgranulecompartments media dae02d2e).
- Price et al. refer to WAGO-1 as a perinuclear WAGO implicated in robust RNAi responses (price2023c.elegansgerm pages 11-12).

4) Pathways and biological processes involving WAGO-1

4.1 Genome surveillance and repression of non-self / repetitive elements

Gu et al. describe WAGO-1 as part of a germline 22G-RNA genome surveillance pathway, mediating silencing of transposons and other aberrant/cryptic loci (gu2009distinctargonautemediated22grna pages 1-2, gu2009distinctargonautemediated22grna pages 7-8). This establishes WAGO-1 as a key effector in protecting germline genome integrity.

4.2 piRNA-triggered secondary 22G-RNA amplification (PRG-1 → WAGO pathway)

Modern transcriptome-wide analyses support that piRNA binding initiates secondary WAGO 22G-RNA production and that the spatial pattern of these secondary 22G-RNAs is linked to piRNA targeting:
- Wu et al. (RNA 2023) report that piRNAs preferentially bind coding sequences (CDS) and that secondary WAGO 22G-RNAs are preferentially produced at the CDS, consistent with production being initiated by piRNA targeting (wu2023transcriptomewideanalysesof pages 9-10, wu2023transcriptomewideanalysesof pages 8-9).
- These analyses operationalize “WAGO targets” using WAGO-1 (or WAGO-9) IP enrichment of 22G-RNAs, linking WAGO-1-associated 22G-RNAs to the piRNA surveillance outcome (wu2023transcriptomewideanalysesof pages 10-11).

4.3 Self vs non-self protection interplay with CSR-1

Wu et al. (RNA 2023) describe distinct mechanisms by which CSR-1 antagonizes the piRNA→WAGO silencing axis: CSR-1 suppresses piRNA binding transcript-wide but suppresses downstream WAGO 22G-RNA accumulation locally at CSR-1 targeting sites (wu2023transcriptomewideanalysesof pages 8-9, wu2023transcriptomewideanalysesof pages 10-11). This provides a mechanistic framework for how “self” transcripts avoid inappropriate WAGO-class silencing.

5) Recent developments (prioritizing 2023–2024)

5.1 Systematic Argonaute resource and WAGO-1 functional context (2023)

Seroussi et al. (eLife, Feb 2023) performed a systematic in vivo analysis of essentially all C. elegans Argonautes using CRISPR tagging and AGO-complex small RNA sequencing. They place WAGO-1 in the WAGO clade/cluster and connect WAGO-class AGOs (including WAGO-1) to silencing of coding genes, pseudogenes, transposons, and cryptic loci, including examples of “WAGO-1-associated 22G-RNAs” targeting another ago gene (wago-5) (seroussi2023acomprehensivesurvey pages 2-3). They also report a technical insight: N-terminal GFP::3xFLAG tagging perturbed WAGO-1 function in some assays, motivating alternative tagging strategies for functional work (seroussi2023acomprehensivesurvey pages 2-3).

5.2 Germ granule organization and specialized 22G-RNA production (2024)

Chen et al. (Nature Communications, Jul 2024) describe germ-granule subcompartmentation and identify a new subcompartment (E granule) organizing RdRP machinery; in this framework, they explicitly position WAGO-1 in P granules as one of the local Argonautes coordinating small-RNA pathway organization (chen2024germgranulecompartments pages 1-2, chen2024germgranulecompartments media dae02d2e). This reinforces the spatial model that Argonautes and RdRP modules are compartmentalized to shape 22G-RNA outputs.

5.3 Germ granules and RNAi robustness across generations (2023)

Price et al. (Nature Communications, Sep 2023) link perinuclear germ-granule architecture to RNA surveillance. They describe redundancy among silencing pathways (including perinuclear WAGO-1) and report that exogenous RNAi can be intact or enhanced over generations even when perinuclear granule organization is disrupted (eggd-1 mutants), supporting robust functional buffering among Argonautes/pathways (price2023c.elegansgerm pages 11-12).

5.4 Transgenerational memory assays intersecting WAGO-1-associated 22G-RNAs (2024)

Bedet et al. (microPublication Biology, May 2024) analyze small RNAs and transgenerational silencing memory in the context of chromatin factor SET-2 and explicitly refer to HRDE-1- and WAGO-1-associated 22G-RNAs in germline silencing contexts (bedet2024thec.elegans pages 1-3, bedet2024thec.elegans pages 3-5). Their assay provides recent quantitative readouts of multigenerational silencing memory where WAGO-1-associated 22G-RNA target sets are enriched among altered genes (bedet2024thec.elegans pages 3-5).

6) Current applications and real-world implementations

Genetic/omics definition of silencing targets using WAGO-1 IP: Wu et al. define “WAGO targets” as genes whose mapped 22G-RNAs show >2-fold enrichment in WAGO-1 IP vs input, a practical operationalization used to separate WAGO-targeted genes from CSR-1 targets in genome-scale analyses (wu2023transcriptomewideanalysesof pages 10-11).
Transgene/foreign sequence silencing paradigms: In the GFP::CDK-1 transgene context, Wu et al. describe that foreign GFP segments produce high levels of WAGO 22G-RNAs, consistent with WAGO-mediated non-self recognition; this is widely used conceptually and experimentally to study germline transgene silencing (wu2023transcriptomewideanalysesof pages 10-11).
RNAi assays (dsRNA feeding) and perinuclear granule manipulation: Price et al. provide a dsRNA feeding RNAi framework (HT115 bacteria on NGM with ampicillin and IPTG; synchronization by bleaching; imaging after 2–3 days) and interpret exogenous RNAi outcomes through the lens of redundant Argonaute pathways that include perinuclear WAGO-1 (price2023c.elegansgerm pages 11-12).
Community resources for localization/function studies: Seroussi et al. demonstrate large-scale CRISPR tagging (GFP::3xFLAG and alternatives like 3xFLAG-only for WAGO-1) coupled to confocal imaging, Western blots, small-RNA cloning from AGO complexes, and phenotyping—methods broadly reused for functional annotation of AGOs including WAGO-1 (seroussi2023acomprehensivesurvey pages 2-3).

7) Expert synthesis and analysis (authoritative perspective)

7.1 Functional positioning of WAGO-1

Across foundational (Gu 2009) and recent mapping (Seroussi 2023; Chen 2024; Price 2023) work, WAGO-1 is best understood as a perinuclear/P-granule Argonaute that implements 22G-RNA-guided post-transcriptional genome surveillance, especially against repetitive or otherwise “non-self” elements and selected silenced genes (gu2009distinctargonautemediated22grna pages 1-2, chen2024germgranulecompartments pages 1-2, seroussi2023acomprehensivesurvey pages 2-3).

7.2 Relationship to transgenerational inheritance

Direct heritable nuclear silencing is most strongly attributed to nuclear Argonautes like HRDE-1/NRDE-3 (weiser2019multigenerationalregulationof pages 3-4, gu2009distinctargonautemediated22grna pages 10-11). However, WAGO-1-associated 22G-RNAs appear in contexts where multigenerational silencing memory is assayed and interpreted (bedet2024thec.elegans pages 1-3, bedet2024thec.elegans pages 3-5). A cautious conclusion supported by the available evidence is:
- WAGO-1 contributes to germline silencing states that can be propagated, but the most definitive “executor” of chromatin-linked, heritable silencing is generally HRDE-1 rather than WAGO-1 (weiser2019multigenerationalregulationof pages 3-4, kasper2014homelandsecurityin pages 6-7).

8) Relevant statistics and quantitative findings

8.1 WAGO target set definitions and sizes (2023)

Wu et al. define WAGO targets as genes with >2-fold enrichment of 22G-RNAs in WAGO-1 IP (or WAGO-9 IP) vs input, yielding n = 3,644 WAGO targets (wu2023transcriptomewideanalysesof pages 10-11). CSR-1 targets (for comparison) were n = 15,821 using analogous criteria (wu2023transcriptomewideanalysesof pages 10-11).

8.2 Transgenerational silencing memory (2024)

Bedet et al. cite dsRNA-induced silencing persisting 9–12 generations in related contexts and report their own multigenerational GFP-silencing readouts:
- F10: WT 1 GFP− / 191 GFP+ vs set-2(syb2085) 61 GFP− / 317 GFP+ (χ² = 30.3; p = 3.66×10⁻8) (bedet2024thec.elegans pages 3-5).
- F12: WT 0 GFP− / 112 GFP+ vs set-2(syb2085) 8 GFP− / 119 GFP+ (χ² = 7.29; p = 0.007) (bedet2024thec.elegans pages 3-5).
These data are interpreted in part using enrichment for HRDE-1- and WAGO-1-associated 22G-RNA targets among genes whose 22G-RNAs increase in set-2 mutants (bedet2024thec.elegans pages 1-3, bedet2024thec.elegans pages 3-5).

8.3 Small-RNA changes linked to WAGO-1-associated target sets (2024)

Bedet et al. identify 241 (syb2085) and 421 (bn129) protein-coding genes with increased 22G-RNAs in set-2 mutants; among genes enriched for HRDE-1/WAGO-1-associated 22G-RNAs, 12–26% are paradoxically upregulated in set-2(bn129) germlines (bedet2024thec.elegans pages 3-5).

8.4 WAGO-1-associated “count” in cluster analysis (2023)

Seroussi et al. present a WAGO-1 label “WAGO-1(2122)” in the context of AGO clustering based on sRNA distributions, consistent with a large WAGO-1-associated set (e.g., targets or loci) in their global survey (seroussi2023acomprehensivesurvey pages 14-15). (The excerpted text does not define the unit explicitly; interpretation should be confirmed in the full figure legend.)

9) Limitations of this report

Some important details (e.g., exact WAGO-1 catalytic motif status from sequence, full interactome, complete phenotypic spectrum in wago-1 nulls, and fine-grained quantitative localization from 2023–2024 microscopy) are likely present in full texts/figures beyond the excerpts retrieved here, and/or in later preprints not prioritized for 2023–2024. This report therefore focuses on claims directly supported by retrieved evidence.

10) Key recent references (URLs and publication dates)

Seroussi U. et al. eLife (Feb 2023). “A comprehensive survey of C. elegans argonaute proteins…” https://doi.org/10.7554/eLife.83853 (seroussi2023acomprehensivesurvey pages 2-3, seroussi2023acomprehensivesurvey pages 23-24)
Wu W.-S. et al. RNA (Feb 2023). “Transcriptome-wide analyses of piRNA binding sites…” https://doi.org/10.1261/rna.079441.122 (wu2023transcriptomewideanalysesof pages 9-10, wu2023transcriptomewideanalysesof pages 10-11)
Price I.F. et al. Nature Communications (Sep 2023). “C. elegans germ granules sculpt both germline and somatic RNAome” https://doi.org/10.1038/s41467-023-41556-4 (price2023c.elegansgerm pages 11-12)
Chen X. et al. Nature Communications (Jul 2024). “Germ granule compartments coordinate specialized small RNA production” https://doi.org/10.1038/s41467-024-50027-3 (chen2024germgranulecompartments pages 1-2, chen2024germgranulecompartments media dae02d2e)
Bedet C. et al. microPublication Biology (May 2024). “SET-2 is not required for transgenerational memory of silencing” https://doi.org/10.17912/micropub.biology.001143 (bedet2024thec.elegans pages 1-3, bedet2024thec.elegans pages 3-5)

Figure evidence (germ granule localization model): Chen et al. 2024 working model depicts WAGO-1 localized within the P granule subcompartment (chen2024germgranulecompartments media dae02d2e).

References

(seroussi2023acomprehensivesurvey pages 2-3): Uri Seroussi, Andrew Lugowski, Lina Wadi, Robert X Lao, Alexandra R Willis, Winnie Zhao, Adam E Sundby, Amanda G Charlesworth, Aaron W Reinke, and Julie M Claycomb. A comprehensive survey of c. elegans argonaute proteins reveals organism-wide gene regulatory networks and functions. eLife, Feb 2023. URL: https://doi.org/10.7554/elife.83853, doi:10.7554/elife.83853. This article has 125 citations and is from a domain leading peer-reviewed journal.
(gu2009distinctargonautemediated22grna pages 1-2): Weifeng Gu, Masaki Shirayama, Darryl Conte, Jessica Vasale, Pedro J. Batista, Julie M. Claycomb, James J. Moresco, Elaine M. Youngman, Jennifer Keys, Matthew J. Stoltz, Chun-Chieh G. Chen, Daniel A. Chaves, Shenghua Duan, Kristin D. Kasschau, Noah Fahlgren, John R. Yates, Shohei Mitani, James C. Carrington, and Craig C. Mello. Distinct argonaute-mediated 22g-rna pathways direct genome surveillance in the c. elegans germline. Molecular cell, 36 2:231-44, Oct 2009. URL: https://doi.org/10.1016/j.molcel.2009.09.020, doi:10.1016/j.molcel.2009.09.020. This article has 628 citations and is from a highest quality peer-reviewed journal.
(chen2024germgranulecompartments pages 1-2): Xiangyang Chen, Ke Wang, Farees Ud Din Mufti, Demin Xu, Chengming Zhu, Xinya Huang, Chenming Zeng, Qile Jin, Xiaona Huang, Yong-hong Yan, Meng-qiu Dong, Xuezhu Feng, Yunyu Shi, Scott Kennedy, and Shouhong Guang. Germ granule compartments coordinate specialized small rna production. Nature Communications, Jul 2024. URL: https://doi.org/10.1038/s41467-024-50027-3, doi:10.1038/s41467-024-50027-3. This article has 28 citations and is from a highest quality peer-reviewed journal.
(seroussi2023acomprehensivesurvey pages 23-24): Uri Seroussi, Andrew Lugowski, Lina Wadi, Robert X Lao, Alexandra R Willis, Winnie Zhao, Adam E Sundby, Amanda G Charlesworth, Aaron W Reinke, and Julie M Claycomb. A comprehensive survey of c. elegans argonaute proteins reveals organism-wide gene regulatory networks and functions. eLife, Feb 2023. URL: https://doi.org/10.7554/elife.83853, doi:10.7554/elife.83853. This article has 125 citations and is from a domain leading peer-reviewed journal.
(gu2009distinctargonautemediated22grna pages 7-8): Weifeng Gu, Masaki Shirayama, Darryl Conte, Jessica Vasale, Pedro J. Batista, Julie M. Claycomb, James J. Moresco, Elaine M. Youngman, Jennifer Keys, Matthew J. Stoltz, Chun-Chieh G. Chen, Daniel A. Chaves, Shenghua Duan, Kristin D. Kasschau, Noah Fahlgren, John R. Yates, Shohei Mitani, James C. Carrington, and Craig C. Mello. Distinct argonaute-mediated 22g-rna pathways direct genome surveillance in the c. elegans germline. Molecular cell, 36 2:231-44, Oct 2009. URL: https://doi.org/10.1016/j.molcel.2009.09.020, doi:10.1016/j.molcel.2009.09.020. This article has 628 citations and is from a highest quality peer-reviewed journal.
(gu2009distinctargonautemediated22grna pages 10-11): Weifeng Gu, Masaki Shirayama, Darryl Conte, Jessica Vasale, Pedro J. Batista, Julie M. Claycomb, James J. Moresco, Elaine M. Youngman, Jennifer Keys, Matthew J. Stoltz, Chun-Chieh G. Chen, Daniel A. Chaves, Shenghua Duan, Kristin D. Kasschau, Noah Fahlgren, John R. Yates, Shohei Mitani, James C. Carrington, and Craig C. Mello. Distinct argonaute-mediated 22g-rna pathways direct genome surveillance in the c. elegans germline. Molecular cell, 36 2:231-44, Oct 2009. URL: https://doi.org/10.1016/j.molcel.2009.09.020, doi:10.1016/j.molcel.2009.09.020. This article has 628 citations and is from a highest quality peer-reviewed journal.
(weiser2019multigenerationalregulationof pages 3-4): Natasha E. Weiser and John K. Kim. Multigenerational regulation of the caenorhabditis elegans chromatin landscape by germline small rnas. Annual review of genetics, 53:289-311, Dec 2019. URL: https://doi.org/10.1146/annurev-genet-112618-043505, doi:10.1146/annurev-genet-112618-043505. This article has 48 citations and is from a domain leading peer-reviewed journal.
(chen2026decodingargonautespecificity pages 47-49): Shihui Chen and C. Phillips. Decoding argonaute specificity: insights from c. elegans and beyond. RNA, 32:290-310, Dec 2026. URL: https://doi.org/10.1261/rna.080816.125, doi:10.1261/rna.080816.125. This article has 1 citations and is from a domain leading peer-reviewed journal.
(chen2024germgranulecompartments media dae02d2e): Xiangyang Chen, Ke Wang, Farees Ud Din Mufti, Demin Xu, Chengming Zhu, Xinya Huang, Chenming Zeng, Qile Jin, Xiaona Huang, Yong-hong Yan, Meng-qiu Dong, Xuezhu Feng, Yunyu Shi, Scott Kennedy, and Shouhong Guang. Germ granule compartments coordinate specialized small rna production. Nature Communications, Jul 2024. URL: https://doi.org/10.1038/s41467-024-50027-3, doi:10.1038/s41467-024-50027-3. This article has 28 citations and is from a highest quality peer-reviewed journal.
(price2023c.elegansgerm pages 11-12): Ian F. Price, Jillian A. Wagner, Benjamin Pastore, Hannah L. Hertz, and Wen Tang. C. elegans germ granules sculpt both germline and somatic rnaome. Nature Communications, Sep 2023. URL: https://doi.org/10.1038/s41467-023-41556-4, doi:10.1038/s41467-023-41556-4. This article has 31 citations and is from a highest quality peer-reviewed journal.
(wu2023transcriptomewideanalysesof pages 9-10): Wei-Sheng Wu, Jordan S. Brown, Sheng-Cian Shiue, Chi-Jung Chung, Dong-En Lee, Donglei Zhang, and Heng-Chi Lee. Transcriptome-wide analyses of pirna binding sites suggest distinct mechanisms regulate pirna binding and silencing in c. elegans. RNA, 29:557-569, Feb 2023. URL: https://doi.org/10.1261/rna.079441.122, doi:10.1261/rna.079441.122. This article has 9 citations and is from a domain leading peer-reviewed journal.
(wu2023transcriptomewideanalysesof pages 8-9): Wei-Sheng Wu, Jordan S. Brown, Sheng-Cian Shiue, Chi-Jung Chung, Dong-En Lee, Donglei Zhang, and Heng-Chi Lee. Transcriptome-wide analyses of pirna binding sites suggest distinct mechanisms regulate pirna binding and silencing in c. elegans. RNA, 29:557-569, Feb 2023. URL: https://doi.org/10.1261/rna.079441.122, doi:10.1261/rna.079441.122. This article has 9 citations and is from a domain leading peer-reviewed journal.
(wu2023transcriptomewideanalysesof pages 10-11): Wei-Sheng Wu, Jordan S. Brown, Sheng-Cian Shiue, Chi-Jung Chung, Dong-En Lee, Donglei Zhang, and Heng-Chi Lee. Transcriptome-wide analyses of pirna binding sites suggest distinct mechanisms regulate pirna binding and silencing in c. elegans. RNA, 29:557-569, Feb 2023. URL: https://doi.org/10.1261/rna.079441.122, doi:10.1261/rna.079441.122. This article has 9 citations and is from a domain leading peer-reviewed journal.
(bedet2024thec.elegans pages 1-3): Cécile Bedet, Piergiuseppe Quarato, Francesca Palladino, Germano Cecere, and Valérie J Robert. The c. elegans set1 histone methyltransferase set-2 is not required for transgenerational memory of silencing. microPublication Biology, May 2024. URL: https://doi.org/10.17912/micropub.biology.001143, doi:10.17912/micropub.biology.001143. This article has 1 citations.
(bedet2024thec.elegans pages 3-5): Cécile Bedet, Piergiuseppe Quarato, Francesca Palladino, Germano Cecere, and Valérie J Robert. The c. elegans set1 histone methyltransferase set-2 is not required for transgenerational memory of silencing. microPublication Biology, May 2024. URL: https://doi.org/10.17912/micropub.biology.001143, doi:10.17912/micropub.biology.001143. This article has 1 citations.
(kasper2014homelandsecurityin pages 6-7): Dionna M Kasper, Kathryn E Gardner, and Valerie Reinke. Homeland security in the c. elegans germ line. Epigenetics, 9:62-74, Jan 2014. URL: https://doi.org/10.4161/epi.26647, doi:10.4161/epi.26647. This article has 35 citations and is from a peer-reviewed journal.
(seroussi2023acomprehensivesurvey pages 14-15): Uri Seroussi, Andrew Lugowski, Lina Wadi, Robert X Lao, Alexandra R Willis, Winnie Zhao, Adam E Sundby, Amanda G Charlesworth, Aaron W Reinke, and Julie M Claycomb. A comprehensive survey of c. elegans argonaute proteins reveals organism-wide gene regulatory networks and functions. eLife, Feb 2023. URL: https://doi.org/10.7554/elife.83853, doi:10.7554/elife.83853. This article has 125 citations and is from a domain leading peer-reviewed journal.

Artifacts

## Context ID: pqac-00000038 Figure 8e (page 13) provides a working model of the C. elegans germ granule subcompartments. It specifically labels the P granule (

Citations

seroussi2023acomprehensivesurvey pages 23-24
chen2024germgranulecompartments pages 1-2
wu2023transcriptomewideanalysesof pages 10-11
seroussi2023acomprehensivesurvey pages 2-3
seroussi2023acomprehensivesurvey pages 14-15
weiser2019multigenerationalregulationof pages 3-4
chen2026decodingargonautespecificity pages 47-49
wu2023transcriptomewideanalysesof pages 9-10
wu2023transcriptomewideanalysesof pages 8-9
kasper2014homelandsecurityin pages 6-7
https://doi.org/10.7554/eLife.83853
https://doi.org/10.1261/rna.079441.122
https://doi.org/10.1038/s41467-023-41556-4
https://doi.org/10.1038/s41467-024-50027-3
https://doi.org/10.17912/micropub.biology.001143
https://doi.org/10.7554/elife.83853,
https://doi.org/10.1016/j.molcel.2009.09.020,
https://doi.org/10.1038/s41467-024-50027-3,
https://doi.org/10.1146/annurev-genet-112618-043505,
https://doi.org/10.1261/rna.080816.125,
https://doi.org/10.1038/s41467-023-41556-4,
https://doi.org/10.1261/rna.079441.122,
https://doi.org/10.17912/micropub.biology.001143,
https://doi.org/10.4161/epi.26647,

📄 View Raw YAML

id: Q21770
gene_symbol: wago-1
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:6239
  label: Caenorhabditis elegans
description: WAGO-1 (Worm-specific Argonaute 1) is a member of the WAGO subfamily
  of Argonaute proteins that functions as a key effector in the endogenous small interfering
  RNA (endo-siRNA) pathway in the C. elegans germline. WAGO-1 binds 22G-RNAs, which
  are RNA-dependent RNA polymerase-derived secondary siRNAs characterized by their
  22-nucleotide length and 5'-guanosine. Unlike canonical Argonaute proteins, WAGO
  subfamily members lack conserved metal-binding residues required for catalytic slicer
  activity and likely function through recruitment of other nucleases for target degradation.
  WAGO-1 localizes to P granules (germline nuage structures) where it functions in
  a genome surveillance system to silence transposons, pseudogenes, and cryptic loci.
  WAGO-1 acts downstream of the primary Argonaute PRG-1 in the piRNA pathway, where
  piRNA-triggered 22G-RNA production leads to loading of these secondary siRNAs into
  WAGO-1 and HRDE-1. WAGO-1 interacts with the Vasa homolog RDE-12 and the zinc-finger
  helicase ZNFX-1 as part of the RNA silencing machinery. The protein is enriched
  in sperm and oocytes and is essential for germline integrity and transposon control.
existing_annotations:
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: IBA annotation based on phylogenetic inference from other Argonaute family
      members. While some Argonaute proteins do localize to the nucleus, the primary
      literature for WAGO-1 specifically demonstrates cytoplasmic P granule localization
      in the germline (PMID:19800275, PMID:24684931). UniProt annotation describes
      WAGO-1 subcellular location as "Cytoplasmic granule" with no nuclear localization
      reported.
    action: REMOVE
    reason: WAGO-1 has been experimentally characterized as localizing to cytoplasmic
      P granules (PMID:19800275). The nuclear annotation appears to be an over-generalization
      from other Argonaute family members. WAGO-1 functions in cytoplasmic post-transcriptional
      gene silencing and there is no direct evidence for nuclear localization in C.
      elegans.
    supported_by:
    - reference_id: PMID:19800275
      supporting_text: We show that, in the germline, one system is dependent on worm-specific
        AGOs, including WAGO-1, which localizes to germline nuage structures called
        P granules
    - reference_id: PMID:24684931
      supporting_text: RDE-12 colocalizes with WAGO-1 in germline P granules and in
        cytoplasmic and perinuclear foci in somatic cells
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        the best-supported assignment is **WAGO-1 as primarily a cytoplasmic/perinuclear post-transcriptional effector** within the WAGO 22G-RNA surveillance pathway
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: IBA annotation for cytoplasmic localization is broadly consistent with
      experimental evidence showing WAGO-1 in cytoplasmic P granules. However, the
      more specific term GO:0043186 (P granule) is preferable as it captures the precise
      subcellular localization.
    action: ACCEPT
    reason: Cytoplasmic localization is accurate - WAGO-1 localizes to cytoplasmic
      P granules (PMID:19800275, PMID:24684931). This is a valid parent term for the
      more specific P granule localization. Retaining as it provides broader context.
    supported_by:
    - reference_id: PMID:19800275
      supporting_text: We show that, in the germline, one system is dependent on worm-specific
        AGOs, including WAGO-1, which localizes to germline nuage structures called
        P granules
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        WAGO-1 is consistently described as a **cytoplasmic/perinuclear germ-granule Argonaute** (P-granule localized)
- term:
    id: GO:0004521
    label: RNA endonuclease activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: This annotation is phylogenetically inferred from slicer-competent Argonaute
      proteins. However, WAGO subfamily Argonautes specifically lack the conserved
      metal-binding residues (DDH/DDX catalytic tetrad) required for endonuclease
      activity. UniProt explicitly notes that WAGO subfamily members lack conserved
      metal-binding residues and probably do not cleave target mRNAs directly (PMID:17110334).
    action: REMOVE
    reason: WAGO-1 lacks the catalytic tetrad required for RNA endonuclease (slicer)
      activity. This is a known distinguishing feature of the WAGO subfamily. The
      protein likely recruits other endonucleases for target degradation rather than
      performing cleavage itself. This annotation is an over-annotation based on ancestral
      function that has been lost in this subfamily.
    supported_by:
    - reference_id: PMID:17110334
      supporting_text: these AGO proteins lack key residues required for mRNA cleavage
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        WAGO-family Argonautes were reported to **lack the catalytic residues required for Slicer activity**, implying WAGO-mediated silencing often occurs via **cleavage-independent mechanisms**
- term:
    id: GO:0035194
    label: regulatory ncRNA-mediated post-transcriptional gene silencing
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: WAGO-1 is a central effector in the 22G-RNA pathway, which is a form
      of endo-siRNA-mediated gene silencing. The protein binds 22G-RNAs and mediates
      silencing of transposons, pseudogenes, and aberrant transcripts in the germline
      (PMID:19800275). This is a core function of WAGO-1.
    action: ACCEPT
    reason: This annotation accurately captures WAGO-1's primary biological function.
      WAGO-1 participates in a regulatory ncRNA-mediated silencing pathway using endogenous
      22G-RNAs. Experimental evidence from PMID:19800275 demonstrates this function
      directly.
    supported_by:
    - reference_id: PMID:19800275
      supporting_text: WAGO-1 silences certain genes, transposons, pseudogenes, and
        cryptic loci
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        WAGO-1 is an Argonaute effector** that binds **secondary 22G-RNAs** and mediates **germline silencing / genome surveillance** of targets including **transposons, pseudogenes, and cryptic loci**
- term:
    id: GO:0016442
    label: RISC complex
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: As an Argonaute protein that binds small RNAs and mediates gene silencing,
      WAGO-1 functions as part of an RNA-induced silencing complex. While the worm-specific
      WAGO-1-containing complex may have distinct features, RISC complex is an appropriate
      general term for Argonaute-containing silencing effector complexes.
    action: ACCEPT
    reason: WAGO-1 is the core Argonaute component of a small RNA-mediated silencing
      complex. It associates with 22G-RNAs and interacts with RDE-12 (PMID:24684931)
      and ZNFX-1 (PMID:29775580) as part of the silencing machinery. RISC complex
      appropriately describes this functional complex.
    supported_by:
    - reference_id: PMID:24684931
      supporting_text: RDE-12 forms an RNase-resistant (target mRNA-independent) complex
        with WAGO-1
    - reference_id: PMID:17110334
      supporting_text: several other AGO proteins interact with amplified siRNAs to
        mediate downstream silencing
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        RdRP-produced 22G-RNAs can be loaded onto WAGOs “**without Dicer**” processing
- term:
    id: GO:0036464
    label: cytoplasmic ribonucleoprotein granule
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: P granules are a type of cytoplasmic ribonucleoprotein granule. WAGO-1
      has been directly demonstrated to localize to P granules (PMID:19800275). This
      term is appropriate as a parent term, though the more specific GO:0043186 (P
      granule) is also annotated with experimental evidence.
    action: ACCEPT
    reason: This is a valid broader annotation. P granules are cytoplasmic ribonucleoprotein
      granules, and WAGO-1 localizes to P granules (PMID:19800275, PMID:24684931).
      The IBA annotation is consistent with experimental data.
    supported_by:
    - reference_id: PMID:19800275
      supporting_text: We show that, in the germline, one system is dependent on worm-specific
        AGOs, including WAGO-1, which localizes to germline nuage structures called
        P granules
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        Germ granules are **perinuclear, RNA-rich, membrane-less condensates** at the cytoplasmic face of germline nuclei
- term:
    id: GO:0035198
    label: miRNA binding
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: This annotation is phylogenetically inferred from miRNA-binding Argonautes.
      However, WAGO-1 specifically binds 22G-RNAs (endogenous siRNAs), not miRNAs.
      The 22G-RNA pathway is distinct from the miRNA pathway in C. elegans. WAGO-1
      binds secondary siRNAs produced by RNA-dependent RNA polymerases, which are
      structurally and functionally distinct from miRNAs.
    action: MODIFY
    reason: WAGO-1 binds 22G-RNAs (endogenous siRNAs), not miRNAs. The miRNA binding
      annotation is an over-generalization from other Argonaute family members. The
      appropriate term is siRNA binding (GO:0035197), which accurately describes binding
      to the 21-23 nt small interfering RNAs that WAGO-1 associates with.
    proposed_replacement_terms:
    - id: GO:0035197
      label: siRNA binding
    supported_by:
    - reference_id: PMID:17110334
      supporting_text: several other AGO proteins interact with amplified siRNAs to
        mediate downstream silencing
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        WAGO-1 associates with **22G-RNAs**: Gu et al. show **transposon 22G-RNAs** are enriched in **WAGO-1 immunoprecipitation** samples
- term:
    id: GO:0003727
    label: single-stranded RNA binding
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: Argonaute proteins bind single-stranded guide RNAs. WAGO-1 binds 22G-RNAs
      in their single-stranded form after processing. This is a valid general molecular
      function annotation for an Argonaute protein.
    action: ACCEPT
    reason: WAGO-1 binds single-stranded 22G-RNAs as guide RNAs for target recognition.
      This is a core molecular function of Argonaute proteins. The annotation is appropriate
      though more specific terms like siRNA binding would also be accurate.
    supported_by:
    - reference_id: PMID:17110334
      supporting_text: Argonaute (AGO) proteins interact with small RNAs to mediate
        gene silencing
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        **22G-RNAs** are ~22-nt small RNAs with a strong **5′ guanosine (5′G) bias**
- term:
    id: GO:0003676
    label: nucleic acid binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  review:
    summary: IEA annotation based on InterPro domains (PAZ and Piwi domains). This
      is a very broad term that is subsumed by more specific RNA binding annotations.
      While technically correct, it provides little informative value given the more
      specific annotations.
    action: ACCEPT
    reason: This is a valid but very general annotation based on domain composition.
      The PAZ and Piwi domains are nucleic acid binding domains. More specific annotations
      (RNA binding, siRNA binding) are also present and more informative.
- term:
    id: GO:0003723
    label: RNA binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000002
  review:
    summary: IEA annotation based on InterPro PAZ domain (IPR003100). WAGO-1 contains
      PAZ and Piwi domains characteristic of Argonaute proteins that bind small RNAs.
      This is a valid general annotation.
    action: ACCEPT
    reason: WAGO-1 binds 22G-RNAs through its PAZ and Piwi domains. RNA binding is
      a core molecular function. This annotation is appropriate as a broader classification
      of the siRNA binding activity.
- term:
    id: GO:0031047
    label: regulatory ncRNA-mediated gene silencing
  evidence_type: IEA
  original_reference_id: GO_REF:0000043
  review:
    summary: IEA annotation based on UniProtKB keyword mapping (RNA-mediated gene
      silencing). This term encompasses both transcriptional and post-transcriptional
      silencing. WAGO-1 primarily functions in post-transcriptional silencing (GO:0035194),
      which is a child term already annotated.
    action: ACCEPT
    reason: This is a valid parent term for the more specific post-transcriptional
      silencing annotation. WAGO-1 is involved in regulatory ncRNA-mediated gene silencing
      using 22G-RNAs. Both this term and the more specific GO:0035194 are appropriate.
    supported_by:
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        Gu et al. describe WAGO-1 as part of a **germline 22G-RNA genome surveillance pathway**, mediating silencing of **transposons and other aberrant/cryptic loci**
- term:
    id: GO:0017151
    label: DEAD/H-box RNA helicase binding
  evidence_type: IPI
  original_reference_id: PMID:24684931
  review:
    summary: This annotation is based on the physical interaction between WAGO-1 and
      RDE-12, a Vasa homolog DEAD-box RNA helicase. PMID:24684931 identified RDE-12
      as a robust interaction partner of WAGO-1 through immunoprecipitation studies.
      RDE-12 is required for secondary siRNA production and colocalizes with WAGO-1
      in P granules.
    action: ACCEPT
    reason: This is a well-supported experimental annotation. PMID:24684931 directly
      demonstrated physical interaction between WAGO-1 and RDE-12 (P90897), a DEAD-box
      RNA helicase. This interaction is functionally important for RNAi and endo-siRNA
      pathways.
    supported_by:
    - reference_id: PMID:24684931
      supporting_text: These studies identified a robust association between WAGO-1
        and a conserved Vasa ATPase-related protein RDE-12
    - reference_id: PMID:24684931
      supporting_text: RDE-12 colocalizes with WAGO-1 in germline P granules and in
        cytoplasmic and perinuclear foci in somatic cells
- term:
    id: GO:0043186
    label: P granule
  evidence_type: IDA
  original_reference_id: PMID:19800275
  review:
    summary: This is a direct experimental annotation showing WAGO-1 localization
      to P granules. PMID:19800275 demonstrated that WAGO-1 localizes to germline
      nuage structures called P granules. This is a key finding that establishes the
      subcellular context for WAGO-1 function in germline gene silencing.
    action: ACCEPT
    reason: Direct experimental evidence (IDA) demonstrating P granule localization.
      This is a core cellular component annotation supported by primary literature.
      P granule localization is essential for WAGO-1's function in germline surveillance.
    supported_by:
    - reference_id: PMID:19800275
      supporting_text: We show that, in the germline, one system is dependent on worm-specific
        AGOs, including WAGO-1, which localizes to germline nuage structures called
        P granules
    - reference_id: PMID:24684931
      supporting_text: RDE-12 colocalizes with WAGO-1 in germline P granules and in
        cytoplasmic and perinuclear foci in somatic cells
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        Chen et al. (2024) explicitly list **“P granule localized CSR-1 and WAGO-1”** in the context of germ granule subcompartment architecture
- term:
    id: GO:0035197
    label: siRNA binding
  evidence_type: IDA
  original_reference_id: PMID:19800275
  review:
    summary: WAGO-1 specifically binds 22G-RNAs, which are endogenous siRNAs. This
      binding activity is central to WAGO-1's function and is directly demonstrated
      in PMID:19800275.
    action: NEW
    reason: WAGO-1 binds 22G-RNAs (endogenous siRNAs). This is a more accurate molecular
      function annotation than miRNA binding, which was incorrectly inferred phylogenetically.
      22G-RNAs are siRNAs by definition - 22 nucleotide small RNAs processed by RdRP.
    supported_by:
    - reference_id: PMID:17110334
      supporting_text: several other AGO proteins interact with amplified siRNAs to
        mediate downstream silencing
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        **WAGO-1** is classified within the **22G-RNA-binding WAGO group/cluster**
- term:
    id: GO:0010526
    label: transposable element silencing
  evidence_type: IMP
  original_reference_id: PMID:19800275
  review:
    summary: WAGO-1 functions in silencing transposons as part of the germline genome
      surveillance system. This is a key biological process function demonstrated
      in PMID:19800275.
    action: NEW
    reason: Transposon silencing is a primary function of the WAGO-1 22G-RNA pathway
      in the germline. This should be annotated as a core biological process function.
    supported_by:
    - reference_id: PMID:19800275
      supporting_text: WAGO-1 silences certain genes, transposons, pseudogenes, and
        cryptic loci
    - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
      supporting_text: |-
        together with related silencing WAGOs (including PPW-2/WAGO-3 and HRDE-1/WAGO-9) that preferentially target **silenced germline genes, pseudogenes, and repetitive/transposable elements**
references:
- id: GO_REF:0000002
  title: Gene Ontology annotation through association of InterPro records with GO
    terms
  findings:
  - statement: InterPro PAZ domain (IPR003100) predicts RNA binding
  - statement: InterPro Piwi domain (IPR003165) predicts nucleic acid binding
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings:
  - statement: Phylogenetic inference from Argonaute family members
  - statement: Some inferred functions may not apply to WAGO subfamily due to loss
      of catalytic residues
- id: GO_REF:0000043
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
  findings:
  - statement: RNA-mediated gene silencing keyword mapped to GO terms
- id: PMID:19800275
  title: Distinct argonaute-mediated 22G-RNA pathways direct genome surveillance in
    the C. elegans germline.
  findings:
  - statement: WAGO-1 localizes to P granules in the germline
    supporting_text: We show that, in the germline, one system is dependent on worm-specific
      AGOs, including WAGO-1, which localizes to germline nuage structures called
      P granules
  - statement: WAGO-1 binds 22G-RNAs (secondary siRNAs)
    supporting_text: Endogenous small RNAs (endo-siRNAs) interact with Argonaute (AGO)
      proteins to mediate sequence-specific regulation of diverse biological processes
  - statement: WAGO-1 silences transposons, pseudogenes, and cryptic loci
    supporting_text: WAGO-1 silences certain genes, transposons, pseudogenes, and
      cryptic loci
  - statement: WAGO-1 is part of a genome surveillance system distinct from CSR-1
      pathway
    supporting_text: We show that, in the germline, one system is dependent on worm-specific
      AGOs, including WAGO-1
  - statement: DRH-3 is required for 22G-RNA biogenesis
    supporting_text: DRH-3 is a core component of RNA-dependent RNA polymerase (RdRP)
      complexes essential for several distinct 22G-RNA systems
- id: PMID:24684931
  title: The Vasa Homolog RDE-12 engages target mRNA and multiple argonaute proteins
    to promote RNAi in C. elegans.
  findings:
  - statement: WAGO-1 physically interacts with RDE-12 (Vasa homolog DEAD-box helicase)
    supporting_text: These studies identified a robust association between WAGO-1
      and a conserved Vasa ATPase-related protein RDE-12
  - statement: RDE-12 colocalizes with WAGO-1 in P granules
    supporting_text: RDE-12 colocalizes with WAGO-1 in germline P granules and in
      cytoplasmic and perinuclear foci in somatic cells
  - statement: RDE-12 is required for secondary siRNA production
    supporting_text: rde-12 mutants are deficient in RNAi, including viral suppression,
      and fail to produce amplified secondary siRNAs and certain endogenous siRNAs
      (endo-siRNAs)
  - statement: RDE-12 forms RNase-resistant complex with WAGO-1
    supporting_text: RDE-12 forms an RNase-resistant (target mRNA-independent) complex
      with WAGO-1
- id: PMID:17110334
  title: Analysis of the C. elegans Argonaute family reveals that distinct Argonautes
    act sequentially during RNAi.
  findings:
  - statement: WAGO subfamily Argonautes lack conserved metal-binding residues
    supporting_text: these AGO proteins lack key residues required for mRNA cleavage
  - statement: WAGO proteins probably do not cleave target mRNAs directly
    supporting_text: these AGO proteins lack key residues required for mRNA cleavage
  - statement: Distinct Argonautes act sequentially in RNAi pathway
    supporting_text: functionally and structurally distinct AGOs act sequentially
      to direct gene silencing
- id: PMID:29775580
  title: ZNFX-1 Functions within Perinuclear Nuage to Balance Epigenetic Signals.
  full_text_unavailable: true
  findings:
  - statement: WAGO-1 interacts with ZNFX-1
  - statement: ZNFX-1 functions in perinuclear nuage for epigenetic regulation
- id: file:worm/wago-1/wago-1-deep-research-falcon.md
  title: Falcon deep research report for C. elegans wago-1 (Q21770)
  findings:
  - statement: |-
      WAGO-1 is a worm-specific Argonaute (WAGO clade) that binds 22G-RNAs and acts as a
      cytoplasmic/perinuclear post-transcriptional effector in germline genome surveillance,
      consistent with the slicer-independent (non-catalytic) nature of WAGO-clade Argonautes.
    supporting_text: |-
      the best-supported assignment is **WAGO-1 as primarily a cytoplasmic/perinuclear post-transcriptional effector** within the WAGO 22G-RNA surveillance pathway
    reference_section_type: OTHER
  - statement: |-
      WAGO-1 is classified within the 22G-RNA-binding WAGO group, together with silencing WAGOs
      (PPW-2/WAGO-3, HRDE-1/WAGO-9) that target silenced germline genes, pseudogenes, and
      repetitive/transposable elements.
    supporting_text: |-
      **WAGO-1** is classified within the **22G-RNA-binding WAGO group/cluster**, together with related silencing WAGOs (including PPW-2/WAGO-3 and HRDE-1/WAGO-9) that preferentially target **silenced germline genes, pseudogenes, and repetitive/transposable elements**
    reference_section_type: OTHER
  - statement: |-
      WAGO-clade Argonautes lack the catalytic residues required for Slicer activity, so
      WAGO-1-mediated silencing occurs via cleavage-independent mechanisms (e.g., recruitment
      of RNA decay/silencing factors), supporting removal of intrinsic RNA endonuclease activity.
    supporting_text: |-
      WAGO-family Argonautes were reported to **lack the catalytic residues required for Slicer activity**, implying WAGO-mediated silencing often occurs via **cleavage-independent mechanisms**
    reference_section_type: OTHER
  - statement: |-
      22G-RNAs are ~22-nt secondary siRNAs with a strong 5' guanosine bias, produced by
      RNA-dependent RNA polymerases and loaded onto WAGOs without Dicer processing.
    supporting_text: |-
      RdRP-produced 22G-RNAs can be loaded onto WAGOs “**without Dicer**” processing
    reference_section_type: OTHER
  - statement: |-
      Transposon 22G-RNAs are enriched in WAGO-1 immunoprecipitation, and 22G-RNA biogenesis
      depends on a core module including DRH-3 and RdRPs (RRF-1/EGO-1) and EKL-1.
    supporting_text: |-
      Gu et al. show **transposon 22G-RNAs** are enriched in **WAGO-1 immunoprecipitation** samples
    reference_section_type: OTHER
  - statement: |-
      WAGO-1 localizes to perinuclear germ granules, specifically P granules; Chen et al. (2024)
      explicitly position P-granule-localized CSR-1 and WAGO-1 within germ granule subcompartments.
    supporting_text: |-
      Chen et al. (2024) explicitly list **“P granule localized CSR-1 and WAGO-1”** in the context of germ granule subcompartment architecture
    reference_section_type: OTHER
  - statement: |-
      WAGO-1 acts downstream of piRNA targeting: piRNA binding initiates secondary WAGO 22G-RNA
      production, with heritable nuclear silencing executed mainly by HRDE-1 rather than WAGO-1.
    supporting_text: |-
      piRNA binding initiates secondary WAGO 22G-RNA production
    reference_section_type: OTHER
core_functions:
- description: WAGO-1 binds 22G-RNAs (endogenous siRNAs) and functions as a core effector
    in post-transcriptional gene silencing of transposons and aberrant transcripts
    in the C. elegans germline.
  molecular_function:
    id: GO:0035197
    label: siRNA binding
  directly_involved_in:
  - id: GO:0035194
    label: regulatory ncRNA-mediated post-transcriptional gene silencing
  - id: GO:0010526
    label: transposable element silencing
  locations:
  - id: GO:0043186
    label: P granule
  in_complex:
    id: GO:0016442
    label: RISC complex
  supported_by:
  - reference_id: PMID:19800275
    supporting_text: WAGO-1 silences certain genes, transposons, pseudogenes, and
      cryptic loci
  - reference_id: file:worm/wago-1/wago-1-deep-research-falcon.md
    supporting_text: |-
      The core function supported by evidence is that **WAGO-1 is an Argonaute effector** that binds **secondary 22G-RNAs** and mediates **germline silencing / genome surveillance** of targets including **transposons, pseudogenes, and cryptic loci**
proposed_new_terms: []
suggested_questions:
- question: What is the mechanism by which WAGO-1, lacking endonuclease activity,
    achieves target mRNA degradation? Does it recruit specific nucleases?
- question: How is the balance between WAGO-1 (silencing) and CSR-1 (protecting) pathways
    maintained for genome surveillance in the germline?
- question: Does WAGO-1 have any transcriptional silencing functions in addition to
    post-transcriptional silencing?
suggested_experiments:
- description: Identify nucleases recruited by WAGO-1 for target degradation using
    proximity labeling or co-IP followed by mass spectrometry
  hypothesis: WAGO-1 recruits specific endonucleases to P granules for target mRNA
    cleavage since it lacks intrinsic slicer activity
- description: Determine the complete catalog of WAGO-1 22G-RNA targets using CLIP-seq
    or similar approaches
  hypothesis: WAGO-1 targets a defined set of transposons, pseudogenes, and cryptic
    loci distinct from CSR-1 targets
- description: Test whether WAGO-1 has any role in chromatin-level silencing using
    ChIP-seq for silencing-associated histone marks in wago-1 mutants
  hypothesis: WAGO-1 may indirectly influence heterochromatin formation through its
    interaction with ZNFX-1 and nuclear Argonautes like HRDE-1
tags:
- caeel-p-granules

wago-1

Gene Description

Existing Annotations Review

Core Functions

WAGO-1 binds 22G-RNAs (endogenous siRNAs) and functions as a core effector in post-transcriptional gene silencing of transposons and aberrant transcripts in the C. elegans germline.

References

Suggested Questions for Experts

Suggested Experiments

Tags

Deep Research

Falcon

Research report: C. elegans wago-1 (UniProt Q21770; ORF R06C7.1) functional annotation

0) Target verification (mandatory)

1) Key concepts and definitions (current understanding)

1.1 Argonautes and WAGOs

1.2 22G-RNAs (secondary siRNAs)

1.3 Germ granules (perinuclear condensates) and surveillance

2) Molecular function of WAGO-1 (primary function, mechanism, substrates)

2.1 Primary function

2.2 Small-RNA partners and their biogenesis module

2.3 Enzymatic activity (slicer vs non-slicer)

2.4 Post-transcriptional vs nuclear silencing

3) Subcellular localization and where WAGO-1 acts

3.1 P-granule / perinuclear localization

4) Pathways and biological processes involving WAGO-1

4.1 Genome surveillance and repression of non-self / repetitive elements

4.2 piRNA-triggered secondary 22G-RNA amplification (PRG-1 → WAGO pathway)

4.3 Self vs non-self protection interplay with CSR-1

5) Recent developments (prioritizing 2023–2024)

5.1 Systematic Argonaute resource and WAGO-1 functional context (2023)

5.2 Germ granule organization and specialized 22G-RNA production (2024)

5.3 Germ granules and RNAi robustness across generations (2023)

5.4 Transgenerational memory assays intersecting WAGO-1-associated 22G-RNAs (2024)

6) Current applications and real-world implementations

7) Expert synthesis and analysis (authoritative perspective)

7.1 Functional positioning of WAGO-1

7.2 Relationship to transgenerational inheritance

8) Relevant statistics and quantitative findings

8.1 WAGO target set definitions and sizes (2023)

8.2 Transgenerational silencing memory (2024)

8.3 Small-RNA changes linked to WAGO-1-associated target sets (2024)

8.4 WAGO-1-associated “count” in cluster analysis (2023)

9) Limitations of this report

10) Key recent references (URLs and publication dates)

Artifacts

Citations

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