Monoclonal Antibody (mAb)
Definition
An antibody produced by a single hybridoma clone, so that every molecule in the preparation is identical, targets the same epitope, and has the same affinity. Monoclonal antibodies give consistent, batch-independent performance in forensic assay kits.
- Source
- Single hybridoma clone
- Specificity
- Targets one epitope with uniform affinity
- Consistency
- Batch-independent performance
- Contrast with
- Polyclonal antibodies (mixed epitope targets)
Common questions
Why is batch-to-batch consistency important for a forensic assay kit specifically?+
Forensic results must be reproducible across laboratories, examiners, and time, sometimes years apart for a retrial or appeal. A monoclonal antibody's uniform composition means a kit manufactured today behaves the same as one made previously, which supports validation studies and long-term reliability of the assay.
What is the main trade-off of using a monoclonal antibody instead of a polyclonal one?+
Because a monoclonal antibody binds a single epitope, a mutation or structural variation at that specific site in the target antigen can cause a false negative that a polyclonal mixture, binding multiple epitopes, would likely still detect. Assay developers weigh this specificity-versus-cross-reactivity trade-off when choosing which antibody type to use.
Related terms
- Cross-Reactivity
- The capacity of an antibody raised against one analyte to bind structurally related compounds. In RIA, cross-reactivity is the main driver of...
- Affinity
- The binding strength of a single antigen-binding site for one epitope, expressed as the equilibrium dissociation constant (Kd). A lower Kd indicates...
- Complementarity-Determining Regions (CDRs)
- Six hypervariable loops, three in the heavy-chain variable domain and three in the light-chain variable domain, that together form the antigen-binding site....
- DNA Barcoding
- Species identification using a short, standardised region of the mitochondrial genome. For animals, the primary barcode marker is a 648-base-pair segment of...
- ELISA (Enzyme-Linked Immunosorbent Assay)
- A plate-based immunoassay format in which a target antigen is captured by an antibody bound to a solid surface, detected by a...
- Fab Fragment
- The antigen-binding fragment of an antibody, consisting of one complete light chain paired with the variable and first constant domain of a...
- Fc Region
- The crystallisable fragment of an antibody, formed by the paired constant domains of the two heavy chains. The Fc region mediates effector...
- Immunochromatographic Strip (Lateral-Flow Assay)
- A single-use membrane device in which sample migrates by capillary action past a conjugate pad containing labelled antibody and a test line...
- Precipitin Test
- A serological method in which an antiserum specific to one species' proteins is mixed with an extract of an unknown specimen. Formation...
Explained in these topics
- Antibody Structure, Classes, and Specificity
- Modern Immunological and Molecular Approaches to Species IdentificationAn antibody produced by a single clone of B-cells (a hybridoma), directed against a single epitope. Monoclonal antibodies offer consistent specificity across b...