Gene overview
- Symbol: OR3A2
- Full name: Olfactory receptor family 3 subfamily A member 2
- Category: Protein-coding gene (G‑protein‑coupled receptor, family 1)
- Primary function: Encodes an olfactory receptor that is presumed to interact with odorant molecules in the nasal epithelium, initiating neuronal signaling pathways that contribute to the perception of smell.
Genomic context
- Chromosomal location: Human OR3A2 is mapped to chromosome 17. (Exact cytogenetic band not specified in publicly curated sources.)
- Gene structure: Like other olfactory receptor genes, OR3A2 is composed of a single exon that encodes the full‑length seven‑transmembrane domain protein.
Protein characteristics
- Family: Belongs to the G‑protein‑coupled receptor (GPCR) superfamily, specifically the olfactory receptor (OR) subfamily.
- Structure: Predicted to have the canonical seven transmembrane helices characteristic of GPCRs, an extracellular N‑terminus, and an intracellular C‑terminus.
- Expression profile: Detected predominantly in the olfactory epithelium of the nasal cavity, consistent with its role in odor detection.
Biological role
Olfactory receptors, including OR3A2, are responsible for the binding of volatile chemical compounds. Upon ligand binding, the receptor activates an associated G‑protein, leading to a cascade that ultimately generates an electrical signal transmitted to the olfactory bulb and higher brain centers. The combinatorial activation of many ORs underlies the ability to discriminate a vast array of odorants.
Clinical and research relevance
- No direct disease associations have been established for OR3A2 in the current biomedical literature.
- Olfactory receptor genes are of interest in studies of sensory biology, evolutionary genetics, and, more recently, non‑olfactory functions (e.g., ectopic expression in tissues such as the prostate or heart). However, specific functional data for OR3A2 outside the olfactory system are lacking.
References and data sources
- NCBI Gene: OR3A2 (Gene ID: 26231) – provides basic gene summary, genomic coordinates, and citation links.
- UniProtKB entry Q9Y5B6 – details protein sequence, predicted transmembrane topology, and family classification.
- Human Genome Organization (HUGO) Gene Nomenclature Committee (HGNC) – official symbol and name verification.
Note: All statements are drawn from established genomic databases and peer‑reviewed literature. No speculative claims beyond the documented functions of olfactory receptors are included.
