Isotype Subclass Determination
Isotype Subclass Determination - Related Videos
05:04
Viral Antigen Microarray Assay to Detect Antibody Isotypes in Serum Against Viral Antigen
0 Views •
2025
In this video, we demonstrate the process for detecting antibody isotypes in multiple human serum samples using a microarray slide printed with antigenic subtypes of influenza virus strains.
09:05
Determining the Phagocytic Activity of Clinical Antibody Samples
0 Views •
Cited by 33 •
2011
We present a high-throughput flow cytometric assay to determine the phagocytic activity of antigen-specific antibodies from clinical samples, utilizing fluorescent antigen-coated beads and a monocytic cell line expressing multiple Fc receptors—providing receptor usage and phagocytic activity determinations in a standardized and reproducible fashion for any antigen of interest.
07:54
Purification of Tubulin with Controlled Posttranslational Modifications and Isotypes from Limited Sources by Polymerization-Depolymerization Cycles
0 Views •
Cited by 6 •
2020
This protocol describes tubulin purification from small/medium-scale sources such as cultured cells or single mouse brains, using polymerization and depolymerization cycles. The purified tubulin is enriched in specific isotypes or has specific posttranslational modifications and can be used in in vitro reconstitution assays to study microtubule dynamics and interactions.
02:53
Determining Order of Reaction
0 Views •
2020
Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
01:51
Determination
0 Views •
2025
During embryogenesis, cells become progressively committed to different fates through a two-step process: specification followed by determination. Specification is demonstrated by removing a segment of an early embryo, “neutrally” culturing the tissue in vitro—for example, in a petri dish with simple medium—and then observing the derivatives. If the cultured region gives rise to cell types that it would normally generate in the embryo, this means that it is specified. In contrast, determination...
FAQs
The method relies on differences in the constant regions of antibody heavy chains, which distinguish classes such as IgM and IgA from the IgG subclasses. Detection reagents or profiling systems are selected for subclass-selective binding, allowing measurements to separate antibody categories within an antigen-specific response rather than treating all antibodies as one group.
Biological isotype switching changes which immunoglobulin heavy-chain constant-region genes are expressed through recombination. Isotype subclass determination can therefore reveal the antibody expression pattern produced during an immune response. Comparing these patterns helps investigators examine how immune activity changes in response to infection, vaccination, or therapeutic intervention.
Different isotypes and IgG subclasses provide a more resolved view of humoral immunity than a single aggregate measurement. Their distribution can help distinguish recent or ongoing immune activity and support investigations of downstream functions, including complement activation and Fc-receptor interactions. This broader profile is useful when evaluating the quality as well as presence of an antibody response.
A typical workflow begins by selecting an antigen-specific immunoassay, flow-cytometry approach, or another antibody-profiling method. The sample is then assessed with detection reagents that bind selectively to the relevant isotype or subclass, and the resulting signals are measured and compared. The final profile indicates which antibody categories are present in the antigen-specific response.
Investigators can apply the analysis to characterize humoral responses associated with pathogens, vaccines, or therapies. Measuring the pattern of antibody classes and subclasses helps distinguish recent or ongoing immune activity and shows how an intervention shapes antibody expression. These results provide context for comparing immune responses across experimental conditions without relying on a single antibody measurement.
Subclass measurements provide an entry point for examining functional consequences linked to antibody constant regions. In immunology and infection research, the results can inform studies of complement activation, Fc-receptor interactions, and protective immunity. Linking the measured profile with these research questions helps investigators assess how antibody composition may relate to broader immune activity.