fyna Antibody
Description
Definition and Antigen Structure
The Fya antigen is one of six Duffy antigens (Fy a, Fy b, Fy3, Fy4, Fy5, Fy6) encoded by the FY gene on chromosome 1q22-q23. It is expressed as a glycoprotein with seven transmembrane domains, functioning as a receptor for cytokines and the malaria parasite Plasmodium vivax. The Fya antigen differs from Fyb by a single amino acid substitution (Gly42 → Asp42), resulting from a G→A polymorphism at position 125 of the FY gene .
| Antigen Property | Fya | Fyb |
|---|---|---|
| Frequency in Caucasians | 66% | 83% |
| Frequency in Blacks | 10% | 23% |
| Frequency in Asians | 99% | 18.5% |
Transfusion Reactions
Anti-Fya antibodies (IgG) are implicated in hemolytic transfusion reactions, particularly in individuals with the Fy(a-b-) phenotype (common in 68% of African-Americans) . These antibodies bind to donor red cells, leading to agglutination and hemolysis.
Hemolytic Disease of the Newborn (HDN)
Maternal anti-Fya antibodies can cross the placenta, causing mild HDN in Fy(a+) infants. Fetal-maternal incompatibility is rare but documented in clinical cases .
Blocking Phenomenon
A case study reported a false-negative Fya typing due to maternal anti-Fya antibodies blocking the Fya antigen on fetal red cells. This highlights the importance of using murine monoclonal antibodies (e.g., MIMA-19) and advanced techniques like flow cytometry to confirm Fya status .
Epitope Mapping and Antibody Specificity
Anti-Fya antibodies target the Gly42 residue, a key determinant of Fya specificity. Pepscan analysis of murine monoclonal antibodies (e.g., MIMA-19) revealed linear epitopes in the extracellular N-terminal domain of the Duffy glycoprotein .
| Antibody | Epitope | Domain |
|---|---|---|
| MIMA-19 | Gly42 | ECD1 |
| MIMA-107 | QLDFEDV (19–25) | ECD1 |
| MIMA-108 | LDF (19–21) | ECD1 |
Malaria Resistance
The Fya antigen confers resistance to P. vivax invasion. Studies in the Brazilian Amazon showed individuals with the Fya+ phenotype (Fya+b−) had a 30–80% reduced risk of clinical vivax malaria . This protective effect is linked to weaker binding of the P. vivax Duffy binding protein (PvDBP) to Fya-expressing cells .
Monoclonal Antibodies
Murine anti-Fya antibodies (e.g., MIMA-19) are used in diagnostic assays and research to detect Fya antigens. Their specificity has been validated in blocking assays and flow cytometry .
Therapeutic Potential
Antibody-conjugated nanoparticles targeting Duffy antigens are under exploration for targeted drug delivery and imaging in inflammatory diseases .
Product Specs
Constituents: 50% Glycerol, 0.01M PBS, pH 7.4
Target Background
- Our findings demonstrate that activation and reduction of Fyn kinase in oligodendrocytes increase and decrease sheath number per cell, respectively. PMID: 23806617
- Yes kinase plays a pivotal role in epiboly and indicates that Yes kinase participates in signaling by focal adhesion kinase during early development. PMID: 15572145
- Fyn kinase plays a crucial role in epiboly during zebrafish development, potentially through its effects on calcium signaling. PMID: 16112104
- Fyn, and potentially other Src family members, are activated by dephosphorylation of the C-terminal tyrosine at fertilization PMID: 16698010
- Our investigation into signaling pathways in early development involved comparing the phosphoproteome of wild-type embryos with Fyn/Yes knockdown embryos that exhibit specific convergence and extension cell movement defects PMID: 18550893
