IgG3 Isotype control antibodies are important tools in immunological research, particularly in techniques such as flow cytometry, immunohistochemistry (IHC), and ELISA. Their primary function is to provide a baseline for assessing non-specific binding, which enhances the reliability of experimental results.

Key characteristics of IgG3 isotype control

• Isotype and Subclass: IgG3 Isotype control antibodies must be of the same isotype (IgG) and subclass (IgG3) as the primary antibody. This ensures that any background signal detected can be accurately attributed to non-specific interactions rather than specific binding to the target antigen.
• Host Species: The control should be derived from the same species as the primary antibody. For example, if the primary antibody is a mouse IgG3, the isotype control must also be a mouse IgG3. This matching is crucial to minimize variations in binding due to differences in species-specific Fc receptor interactions.
• Conjugation Type: If the primary antibody is conjugated to a specific fluorochrome or enzyme for detection purposes, the isotype control must also be conjugated similarly. This ensures that any differences in signal observed during experiments are due solely to specific antibody-antigen interactions rather than discrepancies in detection methods.
• Lack of Specificity: Isotype controls must not recognize any antigens present in the sample being analyzed. This characteristic is vital for confirming that any observed signals are indeed due to specific binding of the primary antibody to its target and not due to non-specific interactions with other components in the sample.