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cell length

METPO:1000881 · CLASS · REVIEWED

A phenotype that inheres in a cell by virtue of its longer dimension when viewed on a plane.

Cell-length control by growth and division timing

DOI-backed graph linking growth rate, division-site placement, and the adder size-control principle to the observed cell-length phenotype.

Cell-length control by growth and division timing Interactive directed graph showing evidence-backed causal relationships for cell length.

Edge evidence

  • elongation rate contributes to cell length RO:0002326

    Elongation rate sets how rapidly a cell extends along its long axis between divisions.

    • DOI:10.1016/j.cub.2014.07.022 cell size is tightly controlled Supports growth/elongation rate as a determinant of cell size.
  • adder size control regulates cell length RO:0002211

    Adder size control sets the inter-division length increment that determines average cell length.

    • DOI:10.1016/j.cell.2014.11.022 cells grow by a fixed amount between divisions Supports the adder principle as the size-control rule producing the length distribution.
  • FtsZ ring (divisome) assembles at division-site placement

    FtsZ assembles at the future division site to initiate cytokinesis.

    • DOI:10.1038/nrmicro2671 FtsZ ring at the future division site Supports FtsZ-ring assembly as the proximate divisome event.
  • division-site placement causes cytokinesis biolink:causes

    Division-site placement directs constriction and cytokinesis.

    • DOI:10.1038/nrmicro2671 directs cell division Supports division-site placement as the trigger for cytokinesis.
  • cytokinesis resets cell length

    Cytokinesis halves the mother cell, resetting daughter cell length.

    • DOI:10.1016/j.cell.2014.11.022 cells grow by a fixed amount between divisions Supports division as the event that resets length each generation.
  • Rod complex (elongasome) mediates sidewall peptidoglycan synthesis

    The Rod complex/elongasome drives sidewall peptidoglycan synthesis.

    • DOI:10.3389/fcimb.2023.1205488 elongasome drives sidewall peptidoglycan synthesis necessary for rod shape and lengthening of the cell prior to division.
  • sidewall peptidoglycan synthesis contributes to cell length RO:0002326

    Sidewall PG synthesis lengthens the cell prior to division.

    • DOI:10.3389/fcimb.2023.1205488 sidewall peptidoglycan synthesis necessary for the lengthening of the cell prior to division.
  • Rod complex (elongasome) mediates elongation rate

    The Rod complex/elongasome mediates cell elongation.

    • DOI:10.1038/s42003-024-07279-y elongation is mediated by the Rod complex (the elongasome).
  • FtsA and ZipA (proto-ring tethers) attaches FtsZ ring (divisome)

    FtsA and ZipA tether FtsZ to the membrane forming the proto-ring.

    • DOI:10.1038/s41579-023-00942-x FtsZ membrane attachment depends on tethers FtsA and ZipA (the proto-ring).
  • FtsWI septal PG synthase drives septum synthesis

    FtsWI septal PG synthases drive septum synthesis.

    • DOI:10.1038/s41579-023-00942-x essential septal peptidoglycan synthases FtsW and FtsI (FtsWI) that drive septum synthesis.
  • septum synthesis contributes to cytokinesis RO:0002326

    Septum synthesis drives division constriction completing cytokinesis.

    • DOI:10.1038/s41579-023-00942-x inactivation of essential divisome proteins blocks division, altering cell length; septum synthesis drives division constriction.
  • Min system and nucleoid occlusion regulates division-site placement RO:0002211

    Min system and nucleoid occlusion determine division site placement via localized negative regulation of FtsZ polymerization.

    • DOI:10.1038/s41579-023-00942-x the Min system and nucleoid occlusion act as localized negative regulators of FtsZ polymerization and thus determine division site placement.

Provenance

Source
METPO (2025-11-25)
Definition source
DOI:10.1016/j.cub.2014.07.022

Parent traits (1)

Children (4)

kg-microbe context

Matched 1 kg-microbe node via direct_metpo.

  • METPO:1000881 [-1.413, -1.159, -3.315, +0.964, …]

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).

Deep research

Generated by just research-trait; source: research/traits/morphology/cell_length-deep-research-falcon.md

Unreviewed literature output — not curated TraitMech content Ontology identifiers suggested below have not been resolved against their ontologies, and some are known to be wrong. Check any CURIE against the source before using it. 
# Curation report: microbial cell length

## Trait record and scope

- **Trait label:** cell length
- **Trait identifier:** **METPO:1000881**
- **Category / kind / status:** MORPHOLOGY / CLASS / REVIEWED
- **Definition:** “A phenotype that inheres in a cell by virtue of its longer dimension when viewed on a plane.”
- **Parent:** METPO:1000059

### Recommended interpretation

For TraitMech, **cell length should mean the long-axis dimension of one segmented microbial cell**, normally measured in micrometres from microscopy. It is an instantaneous morphological state produced by the balance between envelope elongation and division. In rod-shaped bacteria, delaying cytokinesis while lateral wall growth continues generally increases length; activating constriction earlier tends to shorten cells.

Do not treat the following as exact synonyms:

1. **Cell size:** may mean volume, area, mass, or an instrument-dependent proxy. Many foundational papers report “size,” so their use as direct evidence for length needs a rod-shaped-organism or length-specific measurement qualifier.
2. **Cell width:** a separate orthogonal dimension. Under nutrient perturbations, *Bacillus subtilis* length varied from **3.5–12.7 µm**, whereas width varied only **0.92–1.16 µm**, illustrating why size and length should not be conflated (ojkic2021bacterialcellshape pages 1-2).
3. **Filamentation:** failure or delay of septation while growth continues. It may represent an extremely long multinucleate cell, but microscopy must exclude unresolved septa.
4. **Chains:** multiple daughter-cell bodies connected because separation failed. Deletion of *ftsE* in *Caulobacter* produces chained bodies with thin connections, not simply longer individual cells (meier2017ftsexmediatedregulationof pages 1-2).
5. **Hypha, stalk, or multicellular trichome length:** lengths of appendages or multicellular structures, not METPO:1000881 unless individual-cell boundaries are measured separately. The 2024 *Arthrospira* phenotype is principally filament/trichome length (lee2024comprehensiveunderstandingof pages 1-2).
6. **Population-average length:** an assay summary rather than an intrinsic state of every cell. Curations should preserve whether evidence came from single-cell distributions, means, or bulk proxies.

## Current mechanistic model

The most defensible core graph is:

**nutrient/metabolic state → division regulators → FtsZ/Z-ring or divisome activity → division timing/frequency → cell length**, operating alongside **MreB/elongasome-directed peptidoglycan synthesis → longitudinal expansion → cell length**.

FtsZ polymerizes at midcell to recruit the divisome, whereas MreB organizes lateral peptidoglycan insertion through proteins such as PBP2 and RodA. Blocking FtsZ inhibits division and produces filamentation; blocking MreB commonly disrupts rod shape rather than yielding a simple length-only phenotype (lee2023theuniquenterminal pages 1-2). This distinction supports separate graph branches for **division timing** and **elongation/shape maintenance**.

## Candidate nodes grouped by type

### Trait and morphology nodes

- **cell length — METPO:1000881**
- cell width — candidate label only unless the project already has a reviewed METPO term
- cell size, cell volume, cell mass — label-only neighboring traits; do not merge
- filamentous-cell morphology — label-only pending verified ontology mapping
- cell chaining, hyphal length, stalk length, trichome length — boundary-case nodes

### Biological processes and structures

Use verified ontology mappings during implementation; conservative candidates include:

- **cell division — GO:0051301**
- **peptidoglycan biosynthetic process — GO:0009252**
- **cell-cycle process — GO:0022402**
- cytokinesis; Z-ring assembly; septum formation; divisome assembly; constriction; cell separation; lateral cell-wall elongation; chromosome segregation — retain as labels if exact GO mappings are not checked
- Z-ring, divisome, elongasome/Rod complex, cytoplasmic membrane, division site, cell pole, lateral cell wall

### Genes, proteins, and complexes

- **FtsZ:** tubulin-like GTPase; Z-ring scaffold
- **SepF, FtsA:** membrane anchors for FtsZ, with strong taxon dependence
- **MinC, MinD, MinE/MinJ:** spatial regulators of FtsZ positioning; architecture differs among taxa
- **UgtP:** *B. subtilis* glucosyltransferase and nutrient-dependent FtsZ antagonist
- **OpgH:** *E. coli* inner-membrane glucosyltransferase and FtsZ antagonist
- **ClpP/Clp chaperones:** conditional UgtP proteolysis machinery
- **MreB, MreC, MreD, RodA, PBP2:** elongasome/Rod-complex components

Showing the first 60 of 287 lines of findings; the linked file also carries the run's front matter and the prompt it was given — read the full report.

Curation history

  1. · SEEDED_FROM_METPO · seed_from_metpo

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

  2. · CURATED_CAUSAL_GRAPH · claude

    Added DOI-backed causal graph linking elongation rate, adder size control, FtsZ-divisome division-site placement, and cytokinesis to cell length.

  3. · GROUND_CAUSAL_PREDICATES · claude

    Grounded 2 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (RO:0002326×1, RO:0002211×1).

  4. · RENAME_PREDICATE_LABELS · claude

    Renamed 1 causal-edge predicate label(s) to align with existing groundings: triggers → causes ×1.

  5. · GROUND_CAUSAL_PREDICATES · claude

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

  6. · GROUND_CAUSAL_NODES · claude

    Grounded 1 causal-node grounding field(s) via mappings/node_grounding.tsv (GO:0000910×1).

  7. · ENRICH_CAUSAL_GRAPH · claude

    Added 7 evidence-backed generic edges (6 new nodes) from the deep-research report.

  8. · GROUND_CAUSAL_PREDICATES · claude

    Grounded 3 causal-edge predicate_id field(s) via mappings/predicate_grounding.tsv (RO:0002326×2, RO:0002211×1).