OnCo

FYN (Tyrosine-protein kinase Fyn) is a protein kinase, an enzyme that switches other proteins on by adding phosphate groups. The public catalogues list it as a drug target, and an approved or late-stage drug is recorded against it. Tied to Non-Hodgkin lymphoma, Leukaemia, Myeloproliferative neoplasms and 2 more. This dossier gathers the 0 products (0 approved), 0 trials, 0 pathways and 0 resistance routes in the corpus that involve it, with external identifiers so it can be joined to UniProt, ChEMBL, Open Targets and the rest of biology.

Biology

Non-receptor tyrosine-protein kinase that plays a role in many biological processes including regulation of cell growth and survival, cell adhesion, integrin-mediated signalling, cytoskeletal remodeling, cell motility, immune response and axon guidance. Inactive FYN is phosphorylated on its C-terminal tail within the catalytic domain. Following activation by PKA, the protein subsequently associates with PTK2/FAK1, allowing PTK2/FAK1 phosphorylation, activation and targeting to focal adhesions. Involved in the regulation of cell adhesion and motility through phosphorylation of CTNNB1 (beta-catenin) and CTNND1 (delta-catenin). Regulates cytoskeletal remodeling by phosphorylating several proteins including the actin regulator WAS and the microtubule-associated proteins MAP2 and MAPT. Promotes cell survival by phosphorylating AGAP2/PIKE-A and preventing its apoptotic cleavage. Location: Cytoplasm; Nucleus; Cell membrane; Perikaryon (UniProt). Locus 6q21 (HGNC).

Where it is found
  • Non-Hodgkin lymphoma: Open Targets association 0.69 with non-Hodgkin lymphoma (MONDO_0018908)
  • Leukaemia: Open Targets association 0.62 with leukaemia (MONDO_0005059)
  • Myeloproliferative neoplasms: Open Targets association 0.61 with myeloproliferative neoplasm (MONDO_0020076)
  • Chronic myeloid leukaemia: Open Targets association 0.60 with chronic myelogenous leukaemia, BCR-ABL1 positive (MONDO_0011996)
  • Acute lymphoblastic leukaemia: Open Targets association 0.56 with acute lymphoblastic leukaemia (MONDO_0004967)
Class: kinase · Gene: FYN · Facts checked 2026-09-23 · Target page

External identifiers

Built from HGNC, Ensembl, UniProt and ChEMBL ids

Products by modality and phase

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Resistance routes

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No pathway diagram carries this target as a node.

Companion diagnostics

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Preclinical models

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Literature

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Query for this target: (TITLE:"FYN" OR ABSTRACT:"FYN" OR TITLE:"FYN proto-oncogene, Src family tyrosine kinase" OR ABSTRACT:"FYN proto-oncogene, Src family tyrosine kinase" OR TITLE:"Tyrosine-protein kinase Fyn" OR ABSTRACT:"Tyrosine-protein kinase Fyn" OR TITLE:"MGC45350" OR ABSTRACT:"MGC45350") AND (cancer OR tumor OR tumour OR oncology OR carcinoma OR lymphoma OR leukemia OR leukaemia OR myeloma OR sarcoma OR melanoma OR glioma). Results are unfiltered search hits about FYN, not a curated reading list.

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The dossier as machine-readable JSON: identifiers from HGNC, Ensembl, UniProt and ChEMBL, products with status, trials, pathways, hotspots, open questions and assays. The full entity record is in the open API at /api/v1/entities/fyn.json. Licence CC BY-NC 4.0.