Rare diseases · Sign or symptom
Increased circulating IgG subclass concentration
HP:0032296
What it means
An elevation of circulating IgG level predominantly related to an elevation of one of the four IgG subclasses.
The four subclasses, IgG1, IgG2, IgG3, and IgG4, which are highly conserved, differ in their constant region, particularly in their hinges and upper CH2 domains. These regions are involved in binding to both IgG-Fc receptors (Fc-gammaR) and C1q. As a result, the different subclasses have different effector functions,
Part of the broader category
Tracking symptoms like this for someone? Eleplan keeps symptoms, diagnoses, medications and every specialist in one plan.
Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.