Indicators
Along with the immunoglobulin G4 subclass (IgG4), the IgG3 subtype makes up a minor part of circulating antibodies in healthy individuals. The core hinge sequence contains approximately four times the number of amino acids as the other subclasses; allotypes of IgG3 can have up to 62 hinge residues and up to four interchain disulfide bonds. The increased hinge size for IgG3 increases the separation between the Fc (constant fragment) tail and Fab (antigen binding fragment) arms of antibodies of this subclass. This enhances the relative flexibility of the molecule, which may modulate antigen-binding capacity and immune complex formation, and may increase the affinity for binding to both Fc receptors and complement component C1q.
Indicators
Along with the immunoglobulin G3 subclass (IgG3), the IgG4 subtype makes up a minor part of circulating antibodies in healthy individuals. The IgG4 core hinge sequence contains 12 amino acids and two interchain disulfide bonds.This subtype has moderate affinity for binding Fc receptors and does not bind complement component C1q. The production of IgG4 can be stimulated following repeated or long-term exposure to antigen. Elevated levels are found in various diseases and infections and can be indicative of an fibroinflammatory syndrome known as IgG4-related disease.
Indicators
The major immunoglobulin secreted during a primary immune response. IgM binds with low affinity but high avidity (multiple binding sites) because it not only occurs as monomers but also as pentamers and hexamers.
Partner
Invivoscribe lists ILEX MEDICAL LTD. in its distributor directory for Israel.
Partner
Pillar Biosciences lists Illumina in its distributor directory for Global.
Partner
DiaSys lists ILS Danmark in its distributor directory for Denmark.
Tests
The determination of the amount of immunoglobulin G subclass 2 present in a sample.
For professionals
Tests
The determination of the ratio of immunoglobulin G to creatinine in a biological specimen.
For professionals
Tests
The determination of the amount of immunoglobulin heavy constant gamma 2 present in a sample.
For professionals
Article
Research record from Front Pediatr, 2026-04-28. PMID 42130802.
Article
Research record from Int J Mol Sci, 2026-02-27. PMID 41828470.
Article
Research record from Enferm Infecc Microbiol Clin (Engl Ed), 2026-05-22. PMID 42173031.
