Lexicon · NucLex for innovators
Molecular target
Fully specified name: Molecular target (concept)
A molecular entity selected as the focus of an interaction, measurement, or intervention.
- Scope note
- Identity, expression, accessibility, and biological role need separate evidence.
- Synonyms
- None recorded as true synonyms in this context.
- Monograph
- Molecular targeting (planned; brief only)
- External mappings
- None recorded. In W0 no mapping to SNOMED CT® or any external authority is asserted for this entry. A future mapping record will carry source system, identifier, version, relation type, evidence, author, confidence where meaningful, and review state.
- Formal status
- Editorial entry only. It is not part of any released ontology and a prose edit here changes no formal definition.
Draft. This entry is an unreviewed draft. Its sources have not been checked by a named person and no domain reviewer has approved it. Treat every claim as provisional.
Notes
A molecular target is whatever a molecule, a measurement, or a treatment is aimed at: a receptor, an enzyme, a transporter, an antigen, a nucleic acid, or another defined molecular entity. The word "target" describes a role chosen by an investigator, not an intrinsic property. The same protein is a drug target in one study, a biomarker in another, and an incidental finding in a third.
Four questions about a target are often answered as if they were one. Identity asks which molecular entity is meant, including isoforms and modified forms. Expression asks whether, where, and how much of it is present in a given tissue or cell population. Accessibility asks whether a circulating agent can reach it, which depends on blood supply, tissue barriers, and whether the target sits on the cell surface or inside the cell. Biological role asks what the target does and whether binding to it changes anything. A target can be identified and highly expressed yet inaccessible, or accessible yet biologically inert for the purpose at hand.
Gene names, protein names, and clinical shorthand for a target frequently differ, and a physician, a molecular biologist, and a pharmacologist may each use a different one. NucLex treats these as names for one concept where that equivalence has been checked, and records identity, expression, accessibility, and role as separately evidenced statements.