OLFML2A

UniProt ID: A0A8C9H4D2
Organism: Piliocolobus tephrosceles
Review Status: DRAFT
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Gene Description

OLFML2A (Olfactomedin-Like 2A) is a secreted glycoprotein belonging to the olfactomedin superfamily. The protein contains a C-terminal olfactomedin-like domain (IPR003112) that adopts a five-bladed beta-propeller fold and mediates protein-protein interactions. OLFML2A is secreted into the extracellular space where it functions as a non-enzymatic, matricellular regulatory protein involved in cell-extracellular matrix communication, cell adhesion, and modulation of cell migration and proliferation. In human studies, OLFML2A acts downstream of the AP-1 (c-Fos/c-Jun) transcription factor and influences integrin, HGF, and NGF signaling pathways. The protein is broadly conserved across mammals, and its domain architecture and secreted localization are strongly supported by sequence analysis and homology to characterized olfactomedin family members.

Existing Annotations Review

GO Term Evidence Action Reason
GO:0005576 extracellular region
IEA
GO_REF:0000044
ACCEPT
Summary: OLFML2A is predicted to be a secreted protein based on UniProt subcellular location annotation (ARBA evidence) and olfactomedin family membership. Olfactomedin family proteins characteristically carry N-terminal signal peptides and function in the extracellular space as matricellular glycoproteins. The IEA annotation to extracellular region is well-supported by domain and family context and is consistent with the known biology of OLFML-family proteins.
Reason: Secreted localization is strongly supported by the olfactomedin domain architecture, UniProt keyword annotation, and family-wide conservation of extracellular function. IEA based on subcellular location vocabulary mapping is appropriate.
GO:0007165 signal transduction
IEA
GO_REF:0000118
MARK AS OVER ANNOTATED
Summary: TreeGrafter infers signal transduction based on PANTHER family membership. While human OLFML2A has been shown to influence several signaling pathways (AP-1, integrin, HGF, NGF) in cancer cell line studies, the protein itself is not a signal transduction molecule in the conventional sense. It is a secreted ECM glycoprotein that modulates signaling indirectly through protein-protein interactions in the extracellular matrix. The term GO:0007165 (signal transduction) is overly broad and implies a more direct signaling role than is supported by evidence.
Reason: OLFML2A is primarily an extracellular matrix-associated glycoprotein. Its influence on signaling pathways is indirect, mediated through ECM interactions, and has been demonstrated mainly in cancer models via perturbation studies. Annotating it to the broad term signal transduction overstates its role and does not accurately capture its matricellular function.

Core Functions

OLFML2A is a secreted glycoprotein that functions as a matricellular regulator in the extracellular space. It mediates protein-protein interactions through its olfactomedin-like domain and contributes to extracellular matrix organization, cell adhesion, and modulation of cell migration. No enzymatic activity has been demonstrated.

Supporting Evidence:
  • GO_REF:0000044
    Secreted localization inferred from UniProt subcellular location vocabulary mapping.

References

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External Prediction Reviews

These computational predictions are reviewed separately from the GOA annotation set used for this review. The assessments below are from this project and do not constitute official GO annotations or endorsement by GO/UniProt. They are not included in the existing annotation review above.

ProtNLM2 External predictions

View prediction review YAML · A0A8C9H4D2-protnlm-predictions-review.yaml · Review status: COMPLETE

The OLFML2A subfamily assignment and experimentally grounded mouse Olfml2a annotations support inferred extracellular matrix localization and involvement in matrix organization. These are ortholog-based gene-product inferences; secretion and function of the deposited 439-residue primate sequence have not been demonstrated.

Source documents: genes/9PRIM/A0A8C9H4D2/A0A8C9H4D2-uniprot.txt · genes/9PRIM/A0A8C9H4D2/A0A8C9H4D2-goa.tsv · publications/PMID_15836428.md · genes/9PRIM/A0A8C9H4D2/A0A8C9H4D2-prediction-evidence/Q8BHP7-uniprot.txt · genes/9PRIM/A0A8C9H4D2/A0A8C9H4D2-prediction-evidence/Q8BHP7-matrix-organization-quickgo.json · publications/PMID_18757743.md

Review score: 2 = concordant with evidence; 1 = uncertain; 0 = discordant with evidence. This is an assessment score, not a model probability.

GO:0031012 extracellular matrix GO_CC
COR — Correct novel prediction Review score: 2/2
Prediction method: ProtNLM2 · Version: UniProt 2024_06 pilot
Review rationale: The primate target and mouse photomedin-1 (Olfml2a; Q8BHP7) share the OLFML2A PANTHER subfamily PTHR23192:SF29. Mouse photomedin-1 was experimentally secreted as a disulfide-bonded dimer; the photomedins bound chondroitin sulphate-E and heparin, supporting association with extracellular glycosaminoglycans (PMID:15836428). This supports an inferred matrix-associated location for the OLFML2A gene product rather than transferring a generic olfactomedin-domain property. The 439-residue primate record lacks an annotated signal peptide, so secretion of that deposited sequence is not demonstrated; the assignment relies on conserved ortholog biology, not on an observed targeting signal in this record. Matrix association is absent from the cached target annotations, making COR appropriate for this explicitly inferred localization. Matrix organization is assessed separately using the mouse experimental process annotation.
Supporting Evidence:
  • file:9PRIM/A0A8C9H4D2/A0A8C9H4D2-uniprot.txt: "ID A0A8C9H4D2_9PRIM Unreviewed; 439 AA. ... DR InterPro; IPR003112; Olfac-like_dom. ... DR PANTHER; PTHR23192:SF29; OLFACTOMEDIN-LIKE PROTEIN 2A; 1. ... FT DOMAIN 181..439 ... FT /note="Olfactomedin-like""
  • PMID:15836428: "preferentially bound to chondroitin sulphate-E and heparin"
  • file:9PRIM/A0A8C9H4D2/A0A8C9H4D2-prediction-evidence/Q8BHP7-uniprot.txt: "ID OLM2A_MOUSE Reviewed; 681 AA. ... DE AltName: Full=Photomedin-1; ... GN Name=Olfml2a; ... CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:15836428}. ... DR GO; GO:0031012; C:extracellular matrix; IDA:MGI. ... DR GO; GO:0007165; P:signal transduction; IBA:GO_Central. ... DR PANTHER; PTHR23192:SF29; OLFACTOMEDIN-LIKE PROTEIN 2A; 1. ... FT SIGNAL 1..32 ... FT DOMAIN 423..681 ... FT /note="Olfactomedin-like""
GO:0030198 extracellular matrix organization GO_BP
COR — Correct novel prediction Review score: 2/2
Prediction method: ProtNLM2 · Version: UniProt 2024_06 pilot
Review rationale: Mouse photomedin-1 (Olfml2a; Q8BHP7) has an MGI IDA annotation to extracellular matrix organization, with the relation acts_upstream_of_or_within. The QuickGO record identifies PMID:18757743 as its source: a study that includes functional ECM-assembly assays. This is distinct from the secretion and glycosaminoglycan-binding evidence in PMID:15836428. The experimentally grounded curated process annotation, together with the matching OLFML2A PANTHER subfamily PTHR23192:SF29, supports transfer of a broad involvement in matrix organization to the primate gene product. COR denotes this ortholog-based inference, not a demonstrated matrix-remodeling mechanism or an assay of the deposited 439-residue sequence. The process is absent from the cached target annotations.
Supporting Evidence:
  • file:9PRIM/A0A8C9H4D2/A0A8C9H4D2-uniprot.txt: "ID A0A8C9H4D2_9PRIM Unreviewed; 439 AA. ... DR InterPro; IPR003112; Olfac-like_dom. ... DR PANTHER; PTHR23192:SF29; OLFACTOMEDIN-LIKE PROTEIN 2A; 1. ... FT DOMAIN 181..439 ... FT /note="Olfactomedin-like""
  • PMID:15836428: "preferentially bound to chondroitin sulphate-E and heparin"
  • file:9PRIM/A0A8C9H4D2/A0A8C9H4D2-prediction-evidence/Q8BHP7-uniprot.txt: "ID OLM2A_MOUSE Reviewed; 681 AA. ... DE AltName: Full=Photomedin-1; ... GN Name=Olfml2a; ... CC -!- SUBCELLULAR LOCATION: Secreted {ECO:0000269|PubMed:15836428}. ... DR GO; GO:0030198; P:extracellular matrix organization; IDA:MGI. ... DR GO; GO:0007165; P:signal transduction; IBA:GO_Central. ... DR PANTHER; PTHR23192:SF29; OLFACTOMEDIN-LIKE PROTEIN 2A; 1. ... FT SIGNAL 1..32 ... FT DOMAIN 423..681 ... FT /note="Olfactomedin-like""
  • file:9PRIM/A0A8C9H4D2/A0A8C9H4D2-prediction-evidence/Q8BHP7-matrix-organization-quickgo.json: ""geneProductId": "UniProtKB:Q8BHP7", "qualifier": "acts_upstream_of_or_within", "goId": "GO:0030198", "goName": null, "goEvidence": "IDA" ... "reference": "PMID:18757743" ... "assignedBy": "MGI" ... "symbol": "Olfml2a""
  • PMID:18757743: "These assays screened the candidate proteins for ECM-assembling activities"

Deep Research

Falcon

(A0A8C9H4D2-deep-research-falcon.md)

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