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.
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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.
The gene irg-2 (ORF name C49G7.5; UniProt accession O16224) encodes Infection Response Protein 2 in Caenorhabditis elegans. It was originally identified as one of the most strongly pathogen-induced genes in genome-wide transcriptomic analyses of C. elegans exposed to the human pathogen Pseudomonas aeruginosa (troemel2006p38mapkregulates pages 8-9, troemel2006p38mapkregulates pages 7-8). The gene is classified as an immunity-linked gene (ILG), a group first named based on their upregulation following pathogen challenge (fanelli2023immunitylinkedgenesare pages 1-2). irg-2 belongs to the core host immune response gene set in C. elegans and is induced by exposure to diverse bacterial and fungal pathogens (simonsen2012strengthinnumbers pages 5-6).
A seminal study by Troemel et al. (2006) classified pathogen-responsive genes into five classes (A–E) based on their dependence on the PMK-1 p38 MAPK pathway for basal and induced expression. irg-2/C49G7.5 was designated a Class D gene, meaning it is induced by P. aeruginosa infection but does not require PMK-1 for either its basal expression on E. coli or its induction upon pathogen exposure (troemel2006p38mapkregulates pages 8-9, troemel2006p38mapkregulates pages 7-8). This classification indicated early on that irg-2 is regulated by an alternative, PMK-1-independent immune signaling mechanism. Approximately 75% of P. aeruginosa-induced genes were found to be independent of PMK-1, pointing to the existence of additional immune pathways (troemel2006p38mapkregulates pages 9-11, troemel2006p38mapkregulates pages 7-8).
The PMK-1-independent pathway regulating irg-2 was subsequently identified as the ZIP-2 pathway. ZIP-2 is a bZIP transcription factor that, together with its heterodimeric partner CEBP-2, activates transcription of immune effector genes including irg-1 and irg-2 in the intestine (vasquezrifo2020pseudomonasaeruginosacleaves pages 7-9, kniazeva2025translationelongationdefects pages 1-2). ZIP-2 functions as a sensor of translational elongation defects — a form of surveillance immunity. When pathogens such as P. aeruginosa deploy ribosome-targeting toxins (e.g., exotoxin A), host translational elongation is inhibited, triggering a +1 frameshift in the zip-2 mRNA that converts an upstream overlapping open reading frame (oORF) into a functional bZIP transcription factor (kniazeva2025translationelongationdefects pages 3-5, kniazeva2025translationelongationdefects pages 5-6). This mechanism enables rapid, transcription-independent immune activation; the zip-2 mRNA is already transcribed and being translated, so the frameshift produces the functional protein without the delays of new transcription, splicing, or ribosome recruitment (kniazeva2025translationelongationdefects pages 1-2).
irg-2 is strongly induced (over 100-fold) by P. aeruginosa carrying exotoxin A and by various translational elongation inhibitors including hygromycin B, anisomycin, blasticidin S, and fusidic acid (kniazeva2025translationelongationdefects pages 2-3, kniazeva2025translationelongationdefects pages 1-2). This induction requires ZIP-2, as it is abolished by zip-2 mutation or RNAi knockdown (kniazeva2025translationelongationdefects pages 1-2). The ZIP-2 pathway functions independently of the PMK-1/p38 MAPK pathway, consistent with the Class D designation of irg-2 (afridi2025therolesof pages 6-7).
irg-2 expression is also regulated by the TGF-β signaling pathway in C. elegans, mediated by the ligand DBL-1, the receptors DAF-4/SMA-6, and downstream SMAD transcription factors. This positions irg-2 within the broader core host immune response that includes C-type lectins and other immune effectors (simonsen2012strengthinnumbers pages 5-6).
A 2023 study by Fanelli et al. demonstrated that irg-2 is robustly activated when Golgi function is disrupted through knockdown of the ADP-ribosylation factor arf-1 or the coatomer component copa-1 (fanelli2023immunitylinkedgenesare pages 7-9, fanelli2023immunitylinkedgenesare pages 5-7). This activation occurs independently of direct pathogen exposure and is linked to changes in phosphatidylcholine (PC) levels in secretory organelle membranes. Low PC limits ARF-1 function at the Golgi, providing a mechanistic link between lipid metabolism perturbations and ILG activation (fanelli2023immunitylinkedgenesare pages 5-7, fanelli2023immunitylinkedgenesare pages 1-2). This finding helps explain the longstanding observation that ILGs are upregulated both by pathogen attack and by metabolic stress — both converge on disruption of secretory pathway function.
The monounsaturated fatty acid oleate, synthesized by the stearoyl-CoA desaturases FAT-6 and FAT-7, is required for pathogen-induced induction of irg-2. Anderson et al. (2019) showed that the fold induction of irg-2 during P. aeruginosa infection was significantly attenuated in fat-6(tm331);fat-7(wa36) double-mutant animals compared to wild-type (anderson2019thefattyacid pages 6-8). This requirement is specific to oleate and not downstream polyunsaturated fatty acids.
The splicing factor RNP-6 (ortholog of mammalian PUF60) functions as a negative regulator of irg-2 expression. Knockdown of rnp-6 by RNAi significantly elevates irg-2 levels (p<0.0001) under non-infected conditions (kew2020evolutionarilyconservedregulation pages 8-10, kew2020evolutionarilyconservedregulation pages 6-8). RNP-6 suppresses immunity through inhibition of PMK-1 MAPK signaling activity and represents an evolutionarily conserved mechanism balancing immune activation with longevity (kew2020evolutionarilyconservedregulation pages 1-2, kew2020evolutionarilyconservedregulation pages 10-12).
irg-2 is classified as a Class III post-heat stress (post-HS) responsive gene, upregulated specifically during the recovery phase after hormetic heat stress rather than during the acute stress itself (xu2023reprogrammingofthe pages 5-6, xu2023reprogrammingofthe pages 3-5). The endoribonuclease ENDU-2 binds directly to the irg-2 promoter and facilitates RNA polymerase II recruitment, promoting irg-2 transcription after heat stress. This involves cooperation with the SWI/SNF chromatin remodeling complex (xu2023reprogrammingofthe pages 7-9, xu2023reprogrammingofthe pages 11-12, xu2023reprogrammingofthe pages 6-7). RNAi knockdown of irg-2 abolished the beneficial effects of hormetic heat stress, including resistance to subsequent heat and cadmium stress (xu2023reprogrammingofthe pages 5-6).
The following table summarizes the key regulatory pathways controlling irg-2:
| Pathway/Regulator | Effect on irg-2 Expression | Stimulus/Context | Key Reference |
|---|---|---|---|
| ZIP-2 bZIP transcription factor | Positive regulator; required for induction of irg-2 downstream of translational inhibition | Activated during Pseudomonas aeruginosa infection and by translation-elongation defects/ribosome damage caused by bacterial toxins | Vasquez-Rifo et al. 2020; Kniazeva & Ruvkun 2025 (vasquezrifo2020pseudomonasaeruginosacleaves pages 7-9, kniazeva2025translationelongationdefects pages 1-2, kniazeva2025translationelongationdefects pages 3-5, kniazeva2025translationelongationdefects pages 5-6) |
| PMK-1 p38 MAPK | Largely independent; irg-2/C49G7.5 is a Class D pathogen-response gene not requiring PMK-1 for induction | P. aeruginosa infection; induced despite PMK-1 loss, indicating alternative immune signaling | Troemel et al. 2006 (troemel2006p38mapkregulates pages 8-9, troemel2006p38mapkregulates pages 7-8) |
| TGF-β/DBL-1 pathway | Positive regulator of irg-2 as part of core host immune response | Pathogen-responsive immune transcriptional program; linked to DBL-1, DAF-4/SMA-6, and SMAD signaling | Simonsen et al. 2012 review summarizing primary studies (simonsen2012strengthinnumbers pages 5-6) |
| ENDU-2 | Positive regulator; promotes irg-2 transcription by binding its promoter and facilitating Pol II recruitment | Post-heat-stress recovery / heat hormesis; irg-2 is a Class III post-heat-stress responsive gene | Xu et al. 2023 (xu2023reprogrammingofthe pages 7-9, xu2023reprogrammingofthe pages 9-11, xu2023reprogrammingofthe pages 11-12, xu2023reprogrammingofthe pages 5-6, xu2023reprogrammingofthe pages 6-7, xu2023reprogrammingofthe pages 3-5) |
| RNP-6/PUF60 splicing factor | Negative/suppressive regulator; loss of RNP-6 elevates irg-2 expression | Basal immune homeostasis and infection-responsive splicing/PMK-1-linked immune regulation | Kew et al. 2020 (kew2020evolutionarilyconservedregulation pages 8-10, kew2020evolutionarilyconservedregulation pages 6-8, kew2020evolutionarilyconservedregulation pages 1-2, kew2020evolutionarilyconservedregulation pages 10-12) |
| Oleate / fat-6 / fat-7 | Required for full pathogen-induced irg-2 induction; deficiency attenuates induction | P. aeruginosa infection; oleate biosynthesis supports immune effector induction | Anderson et al. 2019 (anderson2019thefattyacid pages 6-8) |
| ARF-1 / Golgi membrane stress pathway | irg-2 is activated when ARF-1 or Golgi trafficking is disrupted | Membrane lipid imbalance, compromised Golgi/secretory function, or increased secretory load; arf-1 or copa-1 knockdown robustly activates irg-2 | Fanelli et al. 2023 (fanelli2023immunitylinkedgenesare pages 7-9, fanelli2023immunitylinkedgenesare pages 5-7, fanelli2023immunitylinkedgenesare pages 1-2) |
Table: This table summarizes the main signaling pathways and cellular stress mechanisms reported to control irg-2 expression in C. elegans. It highlights where evidence supports positive regulation, negative regulation, or pathway independence, which is useful for interpreting irg-2 as an infection- and stress-responsive gene.
irg-2 is predominantly expressed in the intestine of C. elegans, consistent with the intestine's central role as the primary site of pathogen encounter and innate immune activation in this organism (kim2018signalinginthe pages 14-16, xu2023reprogrammingofthe pages 5-6). The intestinal epithelium is the tissue where P. aeruginosa toxins exert their translational inhibition effects, and where the ZIP-2 surveillance pathway operates (vasquezrifo2020pseudomonasaeruginosacleaves pages 7-9, balasubramaniam2025unzippingthedefense pages 15-16). An irg-2p::mCherry transcriptional reporter has been used to monitor its expression pattern, confirming dominant intestinal expression, particularly among post-heat-stress responsive genes (xu2023reprogrammingofthe pages 5-6).
At the subcellular level, functional studies indicate that IRG-2 protein operates within or in association with the secretory pathway. RNAi knockdown of irg-2 causes increased puncta size and aggregation of secreted GFP reporters (ssGFP) in both body wall muscle cells and intestinal cells, phenocopying the effects of arf-1 RNAi knockdown (fanelli2023immunitylinkedgenesare pages 9-12). These findings suggest that IRG-2 functions at the level of Golgi/ER trafficking and protein secretion.
The precise biochemical function of IRG-2 remains incompletely characterized. Unlike many well-annotated immune effectors in C. elegans (e.g., C-type lectins, CUB-domain proteins, lysozymes, or ShK toxin-like proteins), IRG-2 lacks clearly recognizable domains associated with antimicrobial peptide function. It is categorized in the "STRESS RESPONSE: Pathogen: unassigned" WormCat category (fanelli2023immunitylinkedgenesare pages 13-14). No enzymatic activity has been assigned to the protein.
However, the functional evidence from Fanelli et al. (2023) provides important insight. Rather than acting as a conventional antimicrobial effector that directly kills or neutralizes pathogens, IRG-2 appears to function in supporting and protecting the secretory pathway during conditions of membrane stress or immune activation. When irg-2 is knocked down, secreted protein reporters aggregate and pool abnormally, and the accumulation of a pathogen-responsive CUB-domain fusion protein is disrupted (fanelli2023immunitylinkedgenesare pages 9-12, fanelli2023immunitylinkedgenesare pages 13-14). The authors propose that IRG-2 may function as part of a "multi-membrane" stress response encompassing both the ER and the Golgi in trafficking, helping to counteract stress on secretory function that occurs after both pathogen exposure and broad membrane lipid disruption (fanelli2023immunitylinkedgenesare pages 12-13, fanelli2023immunitylinkedgenesare pages 13-14).
This model is consistent with the observation that pathogen responses depend heavily on ER stress pathways to manage the increased demands of immune protein trafficking and secretion (fanelli2023immunitylinkedgenesare pages 12-13). Thus, IRG-2 may be classified as a secretory pathway support factor that is coordinately upregulated during immune activation to ensure efficient production and delivery of antimicrobial effectors.
irg-2 expression is induced by live P. aeruginosa (strain PA14) and by the attenuated gacA mutant strain of PA14, but not by dead P. aeruginosa (kim2018signalinginthe pages 51-52, kim2018signalinginthe pages 46-51). This pattern indicates that irg-2 responds to active bacterial factors — likely virulence effectors such as toxins that inhibit translation — rather than to conserved microbial structural components (pathogen-associated molecular patterns). This is consistent with the surveillance immunity model whereby the host detects the effects of pathogen virulence factors (e.g., translational inhibition) rather than the pathogen molecules themselves (vasquezrifo2020pseudomonasaeruginosacleaves pages 7-9, kniazeva2025translationelongationdefects pages 1-2).
Beyond its role in pathogen defense, irg-2 plays a functional role in heat hormesis — the phenomenon whereby brief heat stress during early adulthood extends lifespan and improves stress resistance in C. elegans. As a Class III post-HS gene, irg-2 is essential for the protective effects of hormetic heat stress. Its transcriptional activation after heat stress is mediated by ENDU-2 and requires chromatin remodeling via the SWI/SNF complex (xu2023reprogrammingofthe pages 11-12, xu2023reprogrammingofthe pages 6-7). Failure to induce irg-2 after heat stress eliminates the beneficial hormetic effects (xu2023reprogrammingofthe pages 5-6).
The requirement for oleate in irg-2 induction (anderson2019thefattyacid pages 6-8) and the activation of irg-2 by membrane lipid perturbations affecting Golgi function (fanelli2023immunitylinkedgenesare pages 7-9, fanelli2023immunitylinkedgenesare pages 5-7) place this gene at the intersection of metabolism and immunity — a concept now termed immunometabolism. These connections suggest that irg-2 expression may serve as an integrating readout of both metabolic state and immune challenge.
irg-2 (C49G7.5) encodes a pathogen-responsive, immunity-linked protein in C. elegans that is principally regulated by the ZIP-2 bZIP transcription factor pathway in response to translational elongation defects caused by pathogen-derived toxins. It is induced independently of the canonical PMK-1 p38 MAPK pathway and is additionally regulated by the TGF-β/DBL-1 pathway, the ARF-1/Golgi membrane stress pathway, the ENDU-2-mediated post-heat stress pathway, and is negatively modulated by the splicing factor RNP-6/PUF60. The protein is predominantly expressed in intestinal epithelial cells and functions within the secretory pathway, where it appears to support protein trafficking and secretion during conditions of immune activation or membrane stress. While IRG-2 lacks recognizable antimicrobial domains, its loss compromises secretory function, suggesting it facilitates the efficient delivery of immune effectors during pathogen challenge. Its involvement in both pathogen defense and heat hormesis illustrates the integrated nature of stress and immune responses in C. elegans.
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