spore shaped

METPO:1000682 · CLASS · REVIEWED

A cell shape in which an organism or differentiated cell has an endospore-like morphology, reflecting a dormant spore body with specialized protective layers.

Spore-shape endospore layer mechanism

Evidence-backed causal sketch linking spore-shaped morphology to forespore engulfment, cortex formation, coat assembly, and dehydrated spore-core maturation.

Spore-shape endospore layer mechanism Interactive directed graph showing evidence-backed causal relationships for spore shaped.

Edge evidence

  • forespore engulfment establishes mature spore body

    Engulfment establishes the forespore as a distinct spore body.

    • DOI:10.1146/annurev.genet.30.1.297 two-cell-chamber sporangium Supports spore morphogenesis through compartmental development.
  • cortex formation builds layer of mature spore body

    Cortex formation builds a specialized spore structural layer.

    • DOI:10.1038/nrmicro2921 spore surface layers Supports specialized spore layers as components of mature morphology.
  • coat assembly builds layer of mature spore body

    Coat assembly builds the multilayered external spore structure.

    • DOI:10.1038/nrmicro2921 mechanisms of coat assembly Supports coat assembly as a morphogenetic process.
  • dehydrated spore core contributes to mature spore body RO:0002326

    Core dehydration contributes to mature spore architecture and resistance.

    • DOI:10.1111/j.1365-2672.2005.02736.x resistance of spores of Bacillus species Supports spore core properties as part of resistant spore morphology.
  • mature spore body manifests as spore shaped METPO:2007400

    Mature spore-body architecture manifests the spore-shaped trait.

    • DOI:10.1038/nrmicro2921 highly resistant dormant cell type known as the spore Supports the trait endpoint.
  • Spo0A phosphorylation positively regulates sporulation initiation

    Phosphorylation of the master regulator Spo0A initiates sporulation.

    • DOI:10.1126/sciadv.adq0791 Spo0A is the master regulator governing entry into sporulation; sporulation initiates upon phosphorylation of Spo0A (generalized across endospore formers).
  • starvation positively regulates sporulation initiation

    Starvation triggers entry into the sporulation differentiation program.

    • DOI:10.1126/sciadv.adq0791 Starvation triggers bacterial spore formation, a committed differentiation program.
  • sporulation initiation leads to forespore engulfment

    Sporulation initiation leads to forespore engulfment.

    • DOI:10.1126/sciadv.adq0791 Sporulation is a committed differentiation program proceeding through forespore engulfment.
  • SpoIVA anchors spore coat

    SpoIVA anchors/tethers coat material to the spore surface (outer forespore membrane).

    • DOI:10.1038/nrmicro2921 SpoIVA functions to anchor coat material to the spore surface; required to tether the coat to the outer forespore membrane (conserved role).
  • SpoVM required for spore encasement

    SpoVM is required for the morphological transition that encases the forespore.

    • DOI:10.1038/nrmicro2921 SpoVM and SpoVID are required for the morphological transition from a single scaffold cap to a full spherical shell that encases the forespore.
  • SpoVID required for spore encasement

    SpoVID is required for spore encasement; mutants block formation of a full coat shell.

    • DOI:10.1038/nrmicro2921 SpoVID is explicitly required for spore encasement; spoVID mutants block formation of a full coat shell.
  • CotE required for assembly of outer coat

    CotE is required for assembly of the spore outer coat.

    • DOI:10.1038/nrmicro2921 SafA is necessary for inner coat assembly and CotE for outer coat assembly.
  • SafA required for assembly of inner coat

    SafA is required for assembly of the spore inner coat.

    • DOI:10.1038/nrmicro2921 SafA is necessary for inner coat assembly; SafA and CotE are respectively required for the deposition of the inner and outer coat.

Provenance

Source
METPO (2025-11-25)
Author
Anthea Guo
Definition source
DOI:10.1038/nrmicro2921

Parent traits (1)

Synonyms (1)

  • spore-shaped RELATED_SYNONYM · metpo.owl

kg-microbe context

Matched 1 kg-microbe node via direct_metpo.

  • METPO:1000682 [-1.729, -2.644, -1.494, +0.751, …]

512-dim DeepWalkSkipGramEnsmallen embedding from kg-microbe (2026-04-25).

Nearest neighbors in embedding space

Top-8 cosine-similar METPO traits from the 2026-04-25 deepwalk (512-D).

Curation history

  1. · SEEDED_FROM_METPO · seed_from_metpo

    imported from data/raw/metpo.owl (CLASS)

  2. · CURATED_WITH_LITERATURE · codex

    Added DOI-backed definition and causal graph for forespore engulfment, cortex formation, coat assembly, dehydrated spore core, and mature spore-body morphology.

  3. · GROUND_CAUSAL_PREDICATES · claude

    Grounded 1 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (RO:0002326×1).

  4. · GROUND_CAUSAL_PREDICATES · claude

    Grounded 1 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (METPO:2007400×1).

  5. · ENRICH_CAUSAL_GRAPH · claude

    Added 8 evidence-backed generic edges (12 new nodes) from the deep-research report.

  6. · GROUND_CAUSAL_NODES · claude

    Grounded 1 causal-node grounding field(s) via mappings/node_grounding.tsv (GO:0031160×1).

  7. · GROUND_CAUSAL_NODES · claude

    Grounded 4 causal-node grounding field(s) via mappings/node_grounding.tsv (UniProtKB:A0A2K8N6W1×1, UniProtKB:A0A0B5ANC0×1, UniProtKB:D5WPR1×1, UniProtKB:A0A0N1QUA1×1).