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Serum anti-myelin oligodendrocyte glycoprotein antibodies are present in up to half of patients with an acquired demyelinating syndrome and have been described in association with a range of phenotypic presentations, including acute disseminated encephalomyelitis, optic neuritis, transverse myelitis, and neuromyelitis optica. [2]
Alternatively spliced human mRNA of the MOG gene form at least nine isoforms. [12] The crystal structure of myelin oligodendrocyte glycoprotein was determined by x-ray diffraction at a resolution of 1.45 Angstroms, using protein from the Norway rat. This protein is 139 residues long, and is a member of the immunoglobulin superfamily. [13]
The anti-mog spectrum in children is equally variated: Out of a sample of 41 children with MOG-antibodies 29 had clinical NMOSD (17 relapsing), 8 had ADEM (4 relapsing with ADEM-ON), 3 had a single clinical event CIS, and 1 had a relapsing tumefactive disorder. Longitudinal myelitis was evident on MRI in 76[percent].
The MOG-related NMO can be radiologically identified by the conus involvement. Myelin-oligodendrocyte glycoprotein antibody–positive patients were more likely to have conus involvement on spinal magnetic resonance imaging. [31]
Myelin-associated glycoprotein (MAG, Siglec-4) is a type 1 transmembrane protein glycoprotein localized in periaxonal Schwann cell and oligodendrocyte membranes, where it plays a role in glial-axonal interactions.
As of 2019, the correlation between CRION and MOG antibody-associated encephalomyelitis is so high that now CRION is considered the most common phenotype related to myelin oligodendrocyte glycoprotein antibodies (MOG-IgG). [9] As of 2021, some reports point out a second kind of CRION due to anti-phospholipid antibodies. [10]
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