Abstract
Human IgA is comprised of two subclasses, IgA1 and IgA2. Monomeric IgA (mIgA), polymeric IgA (pIgA), and secretory IgA (SIgA) are the main molecular forms of IgA. The production of IgA rivals all other immunoglobulin isotypes. The large quantities of IgA reflect the fundamental roles it plays in immune defense, protecting vulnerable mucosal surfaces against invading pathogens. SIgA dominates mucosal surfaces, whereas IgA in circulation is predominately monomeric. All forms of IgA are glycosylated, and the glycans significantly influence its various roles, including antigen binding and the antibody effector functions, mediated by the Fab and Fc portions, respectively. In contrast to its protective role, the aberrant glycosylation of IgA1 has been implicated in the pathogenesis of autoimmune diseases, such as IgA nephropathy (IgAN) and IgA vasculitis with nephritis (IgAVN). Furthermore, detailed characterization of IgA glycosylation, including its diverse range of heterogeneity, is of emerging interest. We provide an overview of the glycosylation observed for each subclass and molecular form of IgA as well as the range of heterogeneity for each site of glycosylation. In many ways, the role of IgA glycosylation is in its early stages of being elucidated. This chapter provides an overview of the current knowledge and research directions.
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Abbreviations
- C1GalT1:
-
Core 1 β1,3-galactosyltransferase
- dIgA:
-
Dimeric IgA
- EBV:
-
Epstein–Barr virus
- ECD:
-
Electron capture dissociation
- ETD:
-
Electron transfer dissociation
- FcRL4:
-
Fc receptor-like 4
- Gal:
-
Galactose
- GalNAc:
-
N-acetylgalactosamine
- GalNAc-T:
-
GalNAc-transferase
- Gd-IgA1:
-
Galactose-deficient IgA1
- HC:
-
Heavy chain
- HR:
-
Hinge region
- Ig:
-
Immunoglobulin
- IgAN:
-
IgA nephropathy
- IgAV:
-
IgA vasculitis
- IgAVN:
-
IgA vasculitis with nephritis
- LC:
-
Light chain
- MBL:
-
Mannose-binding lectin
- mIgA:
-
Monomeric IgA
- MS:
-
Mass spectrometry
- pIgA:
-
Polymeric IgA
- RA:
-
Rheumatoid arthritis
- SA:
-
Sialic acid
- SC:
-
Secretory component
- SIgA:
-
Secretory IgA
- SLE:
-
Systemic lupus erythematosus
- TG2:
-
Transglutaminase 2
- V:
-
Variable
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The authors express their appreciation to the colleagues and collaborators as well as to all volunteers participating in the cited studies. The authors apologize to their colleagues in the field whose work is not adequately discussed or cited in this review due to the space limitations.
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The authors of this study were supported in part by NIH grants AR069516, DK106341, CD122194, GM098539, DK078244, and DK082753 and by a gift from the IGA Nephropathy Foundation of America.
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MBR and JN are co-founders and co-owners of and consultants for Reliant Glycosciences, LLC. MBR and JN are co-inventors on US patent application 14/318,082 (assigned to UAB Research Foundation). ALH and CR declare no conflict of interest.
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Hansen, A.L., Reily, C., Novak, J., Renfrow, M.B. (2021). Immunoglobulin A Glycosylation and Its Role in Disease. In: Pezer, M. (eds) Antibody Glycosylation. Experientia Supplementum, vol 112. Springer, Cham. https://doi.org/10.1007/978-3-030-76912-3_14
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