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Copilot AI commented Dec 16, 2025

Adds a new cell type representing skeletal cells at the murine rib periosteal surface that exhibit hybrid osteochondral properties during injury repair, co-expressing both cartilage (Sox9, Col2a1) and bone (Runx2, Col1a1) markers.

Changes

  • Term ID: CL_9900000 (temporary ID range)
  • Parent: skeletogenic cell (CL_0007001)
  • Location: periosteum (UBERON_0002515) via part_of relationship
  • Taxon: Mus musculus (NCBITaxon_10090)
  • Reference: PMID:30983567
  • Contributor: ORCID 0009-0000-8480-9277

Implementation

Added declaration at line 3294 and full term definition at lines 35476-35485 in src/ontology/cl-edit.owl, following standard CL formatting with all required metadata annotations.

Original prompt

This section details on the original issue you should resolve

<issue_title>[NTR] hybrid osteochondral skeletal cell</issue_title>
<issue_description>Please check that the term does not already exist by using the ontology search tool OLS:
https://www.ebi.ac.uk/ols4/ontologies/cl

Preferred term label
hybrid osteochondral skeletal cell

Synonyms (add reference(s), please)

Definition (free text, with reference(s), please. PubMed ID format is PMID:XXXXXX)

A skeletal cell at the periosteal surface of the murine rib that displays hybrid osteochondral properties, emerging within the large callus that bridges segmental rib defects. It derives from a Sox9-expressing periosteal skeletal stem/progenitor subpopulation that constitutes only a small fraction of uninjured rib periosteum. After injury, these cells populate the callus and co-express cartilage and bone regulators Sox9 and Runx2, as well as matrix genes Col2a1 and Col1a1, while exhibiting dual chondrocyte/osteoblast properties.

PMID: 30983567

Parent cell type term (check the hierarchy here https://www.ebi.ac.uk/ols4/ontologies/cl)
skeletal cell

Anatomical structure where the cell type is found (check Uberon for anatomical structures: https://www.ebi.ac.uk/ols4/ontologies/uberon)
periosteum

Your ORCID
https://orcid.org/0009-0000-8480-9277

Additional notes or concerns
This cell has been identified in mice

</issue_description>

Comments on the Issue (you are @copilot in this section)


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Copilot AI changed the title [WIP] Add hybrid osteochondral skeletal cell term Add CL_9900000: hybrid osteochondral skeletal cell Dec 16, 2025
Copilot AI requested a review from Caroline-99 December 16, 2025 14:41
@Caroline-99 Caroline-99 marked this pull request as ready for review January 7, 2026 13:14
@Caroline-99 Caroline-99 requested review from RiveraAndrea83 and removed request for Caroline-99 January 7, 2026 13:14
@Caroline-99
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#gogoeditdiff

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github-actions bot commented Jan 8, 2026

Here's a diff of how these changes impact the classified ontology (on -base file):

Ontology comparison

Left

  • Ontology IRI: http://purl.obolibrary.org/obo/cl/cl-base.owl
  • Version IRI: http://purl.obolibrary.org/obo/cl/releases/2026-01-08/cl-base.owl
  • Loaded from: file:/__w/cell-ontology/cell-ontology/src/ontology/cl-base-master.owl/cl-base.owl

Right

  • Ontology IRI: http://purl.obolibrary.org/obo/cl/cl-base.owl
  • Version IRI: http://purl.obolibrary.org/obo/cl/releases/2026-01-08/cl-base.owl
  • Loaded from: file:/__w/cell-ontology/cell-ontology/src/ontology/cl-base-pr.owl/cl-base.owl

Ontology imports

Ontology annotations

UBERON_0002515 http://purl.obolibrary.org/obo/UBERON_0002515

Added

hybrid osteochondral skeletal cell http://purl.obolibrary.org/obo/CL_9900000

Added

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github-actions bot commented Jan 8, 2026

Here's a diff of your edit file (unreasoned)

Ontology comparison

Left

  • Ontology IRI: http://purl.obolibrary.org/obo/cl.owl
  • Version IRI: None
  • Loaded from: file:/__w/cell-ontology/cell-ontology/master/src/ontology/cl-edit.owl

Right

  • Ontology IRI: http://purl.obolibrary.org/obo/cl.owl
  • Version IRI: None
  • Loaded from: file:/__w/cell-ontology/cell-ontology/branch/src/ontology/cl-edit.owl

Ontology imports

Ontology annotations

hybrid osteochondral skeletal cell http://purl.obolibrary.org/obo/CL_9900000

Added

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[NTR] hybrid osteochondral skeletal cell

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