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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 second most frequent autoantibody in NMO is MOG-IgG, which targets myelin oligodendrocyte glycoprotein (MOG). MOG is an integral membrane glycoprotein found on the surface of oligodendrocytes and the outermost surface of myelin sheaths. [1] Its function is not entirely known. [1]
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]
EAE can be induced in a number of species, including mice, rats, guinea pigs, rabbits and primates. The most commonly used antigens in rodents are spinal cord homogenate (SCH), purified myelin, myelin protein such as MBP, PLP, and MOG, or peptides of these proteins, all resulting in distinct models with different disease characteristics regarding both immunology and pathology.
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