Lexicon · NucLex for innovators
Subcellular location
Fully specified name: Subcellular location (concept)
The location of an entity within or associated with a cell.
- Scope note
- Record biological context and supporting method.
- 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
Subcellular location describes where within a cell, or on which side of its membrane, an entity is found: at the plasma membrane facing outward, in the cytoplasm, in a vesicle, in the nucleus, in a mitochondrion, or secreted into the surrounding space. For a molecular target the location governs whether a circulating agent can bind it and what happens next. A surface receptor may be reached directly; a target inside the cell requires the agent to cross the membrane or be carried in.
Location is not fixed. Many receptors sit on the surface, bind a ligand, are internalized, and are then recycled or degraded. A statement about location is therefore true of a cell type under particular conditions at a particular moment, and the record should say which.
For nuclear medicine the question has a physical side. Different kinds of radiation travel different distances in tissue. Whether a radionuclide decays outside a cell, at its surface, in the cytoplasm, or near the nucleus can change the energy deposited in the most radiation-sensitive parts of the cell. Location statements thus feed both targeting and dosimetry, though this entry makes no quantitative claim about either.
Evidence is method-dependent. Microscopy, fractionation, and database annotation give different kinds of support, and some annotations are predictions rather than observations. NucLex records the method with the location so that an inferred annotation is not mistaken for a measured one.