Services

Anti-Isotype Antibody Preparation Service

Inquiry

Within a single immune response an animal produces a mixture of antibody classes — IgG, IgA, IgM, IgE and IgD — and IgG itself is divided into subclasses that differ only slightly from one another. Antibodies that recognize one class or subclass while ignoring the others are essential for defining and standardizing other antibodies, yet producing them is difficult precisely because the targets are so similar.

The difficulty is cross-reactivity. The isotypes share most of their sequence, so a useful reagent must be directed at the small region that distinguishes them, and must then be tested against the other isotypes to confirm that it does not react with them. An antibody that binds IgG but also reacts with IgM, or that cannot tell one IgG subclass from another, fails at the task it was made for.

We prepare isotype- and subclass-specific antibodies using careful antigen selection and cross-reactivity screening, starting from purified antibody, mixed serum, or a recombinantly expressed target as the project requires.

What the Service Covers

Isotype-specific antibodies – reagents that recognize one antibody class, such as IgG, IgA, IgM, IgE, or IgD, while avoiding the others.
Subclass-specific antibodies – reagents that distinguish subclasses within a class, where the sequence differences are smallest.
Cross-reactivity screening – testing candidates against the related isotypes and subclasses to confirm the required specificity.
Flexible starting material – working from a purified single isotype, from mixed serum, or from a recombinantly expressed target.

What Makes Isotype Specificity Difficult

The reagents must resolve targets that are, by design, almost identical.

Challenge	Why it matters
High sequence similarity	Isotypes and subclasses share most of their sequence, leaving only a small distinguishing region to target
Abundance differences	A minor isotype can be masked by a more abundant one, so screening must be specific enough to detect the low-abundance target
Cross-reactivity	A reagent that reacts with a related isotype gives false signal; confirming the absence of cross-reactivity is part of the deliverable

Workflow

Define the target isotype – specify the class or subclass to be recognized and the isotypes it must not react with.
Select the starting material and antigen – use purified isotype, mixed serum, or a recombinant target, and design the immunogen around the distinguishing region.
Generate candidates – produce a panel of antibodies by the appropriate route.
Screen for cross-reactivity – test each candidate against the related isotypes and subclasses and retain only those with the required selectivity.
Deliver – supply the antibody with the cross-reactivity data that document its specificity.

Applications

Reagent characterization – defining and standardizing other antibodies by class and subclass.
Detection and secondary reagents – detecting a specific antibody class in a sample without interference from others.
Immunoassay development – class- or subclass-specific reagents for assays that must resolve antibody populations.
Immune response studies – following the distribution of isotypes and subclasses over the course of a response.

Why Work With Us

An isotype-specific antibody is only valuable if its specificity is proven, so we build cross-reactivity screening into the project rather than treating it as an afterthought. We design the immunogen around the region that distinguishes the target, test candidates against the isotypes they must ignore, and document the result so the reagent's selectivity is supported by data and not just assumed.

The service is for research only, not for clinical use.