Can f 1, also known as canis familiaris allergen 1, is a lipocalin protein that serves as a major allergen produced by domestic dogs (Canis lupus familiaris). It is secreted primarily in the tongue epithelial tissue of dogs and is present in saliva, dander, urine, and other skin secretions. The protein shares homology with the human tear‑film lipocalin LCN1 [Wikipedia].
Biochemical Characteristics
- Family: Lipocalin (small extracellular transport proteins characterized by an eight‑stranded β‑barrel fold).
- Structure: Crystal structures, such as PDB entry 7DRU, reveal a typical lipocalin fold with an internal hydrophobic cavity that can bind small ligands [RCB].
- Molecular Weight: Approximately 18–19 kDa.
- Gene: Encoded by the Can f 1 gene located on canine chromosome 9; several isoforms have been described, reflecting genetic variability among dog breeds [NCBI].
Immunological Role
Can f 1 is recognized by IgE antibodies in sensitized individuals and is responsible for a substantial proportion of dog‑related allergic reactions. It can cross‑react with the human lipocalin LCN1 and, to a lesser extent, with cat allergen Fel d 7, potentially broadening its clinical impact [Wikipedia][Allergy Defender].
Clinical Relevance
- Diagnosis: Component‑resolved diagnostics (CRD) often include Can f 1 measurement via ImmunoCAP or ELISA assays to confirm dog allergy and assess sensitization severity.
- Symptoms: Exposure can trigger rhinoconjunctivitis, asthma exacerbations, and atopic dermatitis in predisposed patients.
- Therapeutic Implications: Knowledge of specific sensitization to Can f 1 informs allergen‑specific immunotherapy (ASIT) strategies and may guide avoidance recommendations.
Research Highlights
- The recombinant form of Can f 1 has been cloned and expressed, facilitating detailed immunological studies and the development of standardized diagnostic reagents [Konieczny et al., 1997].
- Population studies have examined genetic variability of Can f 1 among dog breeds, revealing breed‑specific expression patterns that may influence allergenicity [Breitenbuecher et al., 2016].
References
- Wikipedia contributors. “Can f 1.” Wikipedia, The Free Encyclopedia. Retrieved via r.jina.ai.
- Konieczny A et al. (1997). “The major dog allergens, Can f 1 and Can f 2, are salivary lipocalin proteins…” Immunology 92(4):577‑586. PMID: 9497502.
- Jensen‑Jarolim E et al. (2016). “Structural similarities of human and mammalian lipocalins…” Allergy 71(3):286‑294. PMID: 26497994.
- Breitenbuecher C et al. (2016). “Protein expression and genetic variability of canine Can f 1 in golden and Labrador retriever service dogs.” Canine Genetics and Epidemiology 3:3. DOI: 10.1186/s40575-016-0031-3.
- RCSB PDB entry 7DRU – “Crystal Structure of the Dog Lipocalin Allergen Can f 1”.
This summary reflects current encyclopedic knowledge; no speculative information is included.
