📥 Input Chicken Antibody Sequence
DNA or Amino Acid
Load Landmark Preset:
📊 V(D)J Alignment & Boundary Results
Paste a sequence or click a benchmark preset above to align against the Chicken VBASE3 reference catalog.
📖 Chicken Stratum 3 Class I Reference Catalog (Trimmed to Cys104)
100% Repertoire Confirmed
| Gene ID | Locus | Chain | Class | CDR1 (IMGT) | CDR2 (IMGT) | RSS Heptamer | Cys104 Mature Sequence |
|---|
🔗 Canonical Joining (J) & Diversity (D) Segments
| Segment ID | Type | Chain | Synthesis Boundary Motif | Coding Amino Acid Sequence |
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🔬 Landmark Avian & Transgenic Clones
Verified Synthesis Boundaries
🏛️ Avian Immunogenetics & Therapeutic Engineering Notes
Avian Antibody Diversification & The Single Rearranging V-Gene Paradigm:
Birds, specifically the domestic chicken (Gallus gallus), employ a fundamentally distinct genetic mechanism to generate antibody diversity compared to mammals. While mammals utilize combinatorial V(D)J rearrangement among hundreds of functional germline genes, chickens possess only a single functional rearranging heavy chain gene (IGHV1-1) and a single functional rearranging light chain gene (IGLV1-1) (Reynaud et al., 1987, 1989).
Key Structural & Immunogenetic Hallmarks in VBASE3:
- Somatic Gene Conversion in the Bursa of Fabricius: Following initial V-D-J recombination of the single functional genes, repertoire diversification occurs primarily in the bursa through non-reciprocal homologous recombination (gene conversion). Upstream clusters of donor pseudogenes (approximately ~220 heavy and ~25 lambda pseudogenes) act as sequence donors, transferring short nucleotide blocks into the active V-exon.
- The OmniChicken Platform: Transgenic chickens engineered with human or diversified variable repertoires (OmniChicken) have become leading platforms for generating antibodies against highly conserved mammalian drug targets, which are non-immunogenic in rodents due to immune tolerance.
- DT40 In Vitro Directed Evolution: The avian DT40 bursal lymphoma line maintains an active somatic gene conversion and hypermutation machinery in culture, making it an indispensable tool for cell-based directed evolution and antibody affinity maturation.
- Avian IgY Diagnostic Advantages: Chicken yolk antibodies (IgY) lack a mammalian-style hinge region and do not bind to human rheumatoid factor (RF), human anti-mouse antibodies (HAMA), or mammalian complement component C1q, completely avoiding false-positive background in clinical immunoassays.
- Strict IMGT Synthesis Boundaries: Canonical synthesis endpoints (
TVSSfor heavy andTVLfor lambda) ensure zero constant region bleed-through in recombinant synthesis. - 100% Stratum 3 Class I Compliance: Both primary functional rearranging V-genes (IGHV1-1 and IGLV1-1) are trimmed strictly to Cys104 without trailing junctional residues.