fungal adhesive-column trap formation

traitmech:000681 · CLASS · PROPOSED

A morphological phenotype in which a fungus forms columns of serially arranged hyphal cells with adhesive surfaces that serve as nematode traps.

Trait evidence (2)

  • DOI:10.1016/j.isci.2020.101057
    Fungi with the AC device form a string of cells with adhesive surfaces

    Ji et al. (2020), Introduction, third paragraph; AC means adhesive column. Primary full-text XML at https://www.ebi.ac.uk/europepmc/webservices/rest/PMC7186526/fullTextXML and actual Figure 1 inspected. Figure 1C shows a column attributed to source-named Dactylellina cionopagum; Figure 1G shows nematode capture by multiple columns. This morphology differs from the network, knob and constricting-ring comparators. Gene-family expansion and expression correlations do not establish a causal protein requirement for column formation. The cited adhesion-gene disruption experiment concerns Arthrobotrys oligospora, not this column-forming organism. Supplemental Methods were not retrieved completely; no strain identity or universal culture condition is inferred from this paper.

  • DOI:10.1111/lam.12557
    Dactylellina cionopaga YMF1·01472, producing adhesive columns

    Su et al. (2016), scientific Abstract, final sentence, directly retrieved from NCBI XML for PMID:26928264 at https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=pubmed&id=26928264&retmode=xml. Abstract-only access: full Methods and figures were not retrieved. The abstract reports ammonia-associated trap induction in several fungi and names this culture as column-producing. The initial 11-bacterium assay and its detailed volatile-compound analysis concern A. oligospora, not eleven independent column-forming isolates. No universal ammonia requirement, dosage, effect size or molecular induction pathway is asserted. Strain provenance remains unresolved; this is qualified phenotype evidence, not a natural canonical exemplar.

Provenance

Identifier source
TraitMech local identifier
Definition source
DOI:10.1016/j.isci.2020.101057

kg-microbe context

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

Discussions and Knowledge Gaps (3)

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

Resolve a closer fungal trap-morphology parent.

CURATION TODO RESOLVED adhesive-column-scope-and-parent · raised by codex · 2026-10-08

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.

Phenotype METPO:1000059 is a broad parent. Existing mycelial growth traitmech:000074 explicitly concerns bacteria; hyphal anastomosis traitmech:000605 denotes fusion. Distinguish multicellular adhesive columns from unicellular knobs, interconnected net loops, nonconstricting rings and mechanically constricting rings. A generic hyphal branch, branched-shaped cell or nematophagous genus is not sufficient. Adhesive branch is not asserted as an exact synonym without resolving its usage boundaries. No exact synonyms, xrefs, SSSOM equivalences or organism-level disjointness are asserted. Neighboring scope exclusions are not unresolved exact groundings; their closer-parent questions remain open.

Resolution: Added fungal nematode-trap formation traitmech:000718 as the direct broader phenotype. The existing child definition entails specialized hyphal trap differentiation. This resolves only the parent gap; the historical scope contrasts, unasserted mappings, examples and separate mechanism questions remain applicable. Formation does not guarantee immediate capture. The column cell-count question is separately OPEN. Preserve the historical phenotype axiom and add METPO:1063400 SubClassOf METPO:1067100 on upstream adoption.

Resolve natural strain provenance and column-specific mechanisms.

KNOWLEDGE GAP OPEN adhesive-column-strains-and-mechanism · raised by codex · 2026-10-08

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.

Live NCBI https://eutils.ncbi.nlm.nih.gov/entrez/eutils/efetch.fcgi?db=taxonomy&id=47266 resolves Dactylellina cionopaga at species rank, with Monacrosporium cionopagum and Dactylella cionopaga synonyms. It does not identify YMF1.01472 as a strain accession or establish its origin. The 2020 paper's cionopagum spelling and experimental strain must be reconciled before a canonical example is added; do not conflate strains across these papers. Formation, adhesion, capture, penetration and digestion are separate endpoints; formation alone does not guarantee capture in every condition. Protein-resolved causal graphs require column-specific perturbation/complementation evidence and taxon-paired accessions. Sequence features and expression correlations are not validated phenotype predictors. No mechanism is transferred from nets, knobs or rings; mechanism is deferred, not claimed absent.

Reconcile serial-cell column scope with the supplement's broader cell-count description.

CURATION TODO OPEN adhesive-column-cell-count-scope · 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.

The current definition retains serially arranged cells, supported by Ji's Introduction. The newly inspected 2020 Transparent Methods, Fungal strains, PDF page 12, describes columns containing one or more cells. Preserve this source-level difference pending review of single-cell columns versus knobs; do not silently broaden the child or make cell number the sole discriminator. Both usages fit fungal nematode-trap formation, so this question does not reopen the resolved parent gap. The supplement names YMF1.00569 from Deqin soil, not the 2016 paper's YMF1.01472. That provenance does not establish identity between the strains or a canonical example. The earlier evidence notes record limited supplement access at initial curation; this follow-up adds the inspected page without claiming a complete supplement audit.

Evidence

Curation history

  1. · MINTED_TRAITMECH_ID · codex

    Added fungal adhesive-column trap formation with two primary DOI sources and contiguous source-checked snippets. Ignored-and-hidden main/worktree/open-PR checks support 000681 and v557 block 1063400-1063499. Kept strain provenance and protein mechanism unresolved, distinguishing morphology from sequence correlations and induction observations. Existing records unchanged. Timestamp is observed UTC.

  2. · REFINE_FUNGAL_TRAP_PARENT · codex

    Refined traitmech:000681 below fungal nematode-trap formation traitmech:000718 and resolved its temporary parent discussion by definition-based inference. Preserved child identity, definition, evidence, examples, mechanism gaps and earlier history. Added a separate source-backed cell-count scope question after inspecting the 2020 supplement; no identity broadening.

Recorded curation sessions

  • · claude-code
    • CREATE — Add fungal adhesive-column trap formation

      Added traitmech:000681 and companion proposal v557, reserving METPO:1063400-1063499 after ignored-and-hidden searches of 20 registered worktrees, CommunityMech and a complete five-open-PR exact-head snapshot including drafts. Two distinct primary DOI sources and contiguous snippets support serially arranged adhesive column traps. Read 2020 full-text XML and actual Figure 1; 2016 scientific abstract only. Supplemental Methods downloads incomplete, so strain provenance and a canonical exemplar are deferred; live NCBI species identity does not establish strain identity. No gene mechanism is inferred from sequence abundance or expression correlations. Existing YAML and previous history are unchanged. Guarded writer, proposal and focused tests accompany the record; validation and review results will be recorded in the PR.

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  • · codex
    • AUDIT — Correct session actor attribution without changing the trait

      Corrects history/records/fungal_adhesive_column_trap_formation/2026-10-08T135713Z-claude-code-9de31b.yaml: session.actors.name should be codex, not claude-code. The original command omitted --actor-name and therefore retained the scaffolder default. The original model gpt-5 and agent_tool codex were correct. This append-only audit preserves the original entry and changes no TraitRecord fields or biological claims. The add-trait skill already explicitly instructs passing and inspecting --actor-name (#1776), so no redundant skill change is needed.

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  • · codex
    • EDIT — Refine fungal trap morphology parent

      Refined the direct parent to traitmech:000718 and resolved only the parent-gap discussion by definition-based inference; preserved child identity, definition, evidence, examples, other mechanism gaps and previous history. Added a separate OPEN cell-count scope question from Ji 2020 Transparent Methods page 12; preserved the serial-cell definition and distinct strain identities.

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