TraitMech

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nematode-attracting activity

traitmech:000721 · CLASS · PROPOSED

A physiological capability of a microorganism to elicit directed movement of nematodes toward itself or substances it produces.

Trait evidence (2)

  • DOI:10.7554/eLife.20023
    C. elegans and other nematodes were attracted to volatile compounds produced by A. oligospora.

    Hsueh et al. 2017, PMID:28098555, scientific abstract; native VERIFIED and direct original XML match, not an editorial digest. The producer is Arthrobotrys oligospora CBS 115.81. The 2 h assay physically separates fungal material from nematodes and compares fungal volatiles with medium controls. Actual Figure 1B/D inspected: adult responses are stronger than L1/dauer responses, and not every tested nematode species is attracted. Figure 1D, not the capture image 1E, supplies the multispecies behavioral comparison. Sodium azide retains arrivals; it is not microbial killing evidence. No universal host range, evolutionary adaptation or exact pheromone mimicry is inferred.

  • DOI:10.1038/ismej.2015.134
    We showed that C. elegans is attracted to L. paracasei grown on citrate or yuzu media.

    Choi et al. 2016, online 2015, PMID:26241504, Discussion opening paragraph; native NOT_IN_ABSTRACT and direct publisher HTML match. Lactobacillus paracasei YSM0385-bearing plugs on the lid are compared with matched bacteria-free medium in a 1 h adult C. elegans N2 assay. Citrate medium includes glucose plus citrate. Actual Figures 1-4 and HTML Table 1 inspected; the table's wild co-occurrence observations alone do not establish attraction. Sodium azide retains arrivals, not bacterial toxicity. Wild isolate Y091 is only Lactobacillus sp., not an inferred L. paracasei assignment. Field recruitment, microbial benefit and nematode fitness benefit are not adopted.

Provenance

Identifier source
TraitMech local identifier
Definition source
DOI:10.7554/eLife.20023

Parent traits (1)

kg-microbe context

No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.

Discussions and Knowledge Gaps (2)

Open questions attached to this trait. Seeded by just knowledge-gap-scan and curated; see the corpus-wide index.

Refine the hierarchy while preserving the microbial actor and nematode movement endpoint.

CURATION TODO OPEN nematode-attraction-scope-and-hierarchy · raised by codex · 2026-10-13

Not yet attached to a section of this record — a curator sets attaches_to (e.g. causal_graphs#some_edge) so the gap shows beside the mechanism it concerns.

This is the microorganism's attracting capability, not its own chemotaxis or a nematode's sensory trait. Passive retention, co-occurrence, trapping, paralysis, killing or consumption alone are insufficient; attraction need not imply any of those outcomes. Neither infection nor predatory intent is required. Phenotype METPO:1000059 is the conservative parent; the trap-formation, fungal-nematophagy and lethal-nematicidal records are related, not equivalents or necessary parents. Pinned/current METPO annotations and templates yielded no exact active or deprecated counterpart in the documented screen. v597 proposes the missing class. No exact synonyms, xrefs or organism-level disjointness are asserted.

Resolve source discrepancies and strain provenance before adding canonical taxa or microbial mechanisms.

KNOWLEDGE GAP OPEN nematode-attraction-source-and-mechanism-limits · raised by codex · 2026-10-13

Not yet attached to a section of this record — a curator sets attaches_to (e.g. causal_graphs#some_edge) so the gap shows beside the mechanism it concerns.

Hsueh's five-compound exclusivity caption conflicts with a 2-methyl-1-butanol medium-control signal in its source workbook; no exclusive chemical signature is adopted. The published review exchange questions sex-pheromone mimicry and adaptation; host neuronal genetics do not establish fungal genes. Choi's host odr-10 allele is ky32 in Methods/captions but ky10 in Results; no correction is inferred. Its shared supplement link yields a colony-count image, not a separately verified S2 diacetyl calibration. Choi's typeset PDF and complete raw statistics were not audited. Strain provenance and authority taxonomy remain unchecked for canonical-example purposes. No shared microbial mechanism, proteins or causal graph is asserted. Source hashes, native outcomes, bounded notice checks and inspection limits are retained in the source verification sidecar.

Curation history

  1. · MINTED_TRAITMECH_ID · codex

    Added a microbial nematode-attracting capability with two DOI-backed primary studies and directly matched snippets. Retained host/stage, growth-medium and source discrepancies; distinguished attraction from microbial taxis, trapping, killing and feeding. Reserved 000721, v597 and 1067400-1067499 after ignored/hidden current-copy, retained-history and open/draft PR checks with numeric false positives adjudicated. No exact active METPO counterpart was identified in the inspected scope. Other records remain unchanged. Timestamp is observed acceptance after source and allocation assessment, not the later file write.

Recorded curation sessions

  • · codex
    • CREATE — Add nematode-attracting activity

      Added one PROPOSED microbial attracting capability with two primary DOI-backed snippets. Hsueh supplies definition authority; Choi supplies separate primary support. Native canary outcomes VERIFIED and NOT_IN_ABSTRACT remain distinct from exact direct-source matches. Retained host/stage, medium, allele, supplementary-source and mechanism limitations in notes and two OPEN discussions. No canonical taxa, exact xrefs, synonyms, proteins or graph asserted. Ignored/hidden current-copy and retained-history novelty and remote open/draft reservation checks found no same-scope owner or competing allocation after numerical false-positive adjudication. v597 reserves 1067400-1067499 for local 000721. The record timestamp is observed acceptance; this history records the later CREATE. Other records and protected spore germination are unchanged.

    Read this curation session