Case report Anti-myelin oligodendrocyte glycoprotein (MOG) antibodies in a Japanese boy with recurrent optic neuritis

Background: Myelin oligodendrocyte glycoprotein (MOG) localizes on the outermost surface of the myelin sheath and oligodendrocytes in the central nervous system (CNS). Autoantibodies against MOG are reportedly found in patients with spectrum of inflammatory demyelinating diseases of the CNS, including acute disseminated encephalomyelitis, multiple sclerosis, and neuromyelitis optica. In addition, recent studies have emphasized an association between anti-MOG antibodies and optic neuritis. Patient: We present the first case report of a 7-year-old Japanese boy who was positive for anti-MOG antibodies. He experienced four episodes of unilateral optic neuritis and one seizure event. Magnetic resonance imaging revealed T2-hyperintense lesions in the subcortical white matter and midbrain. Although he fulfilled the diagnostic criteria for multiple sclerosis, recombinant interferon beta did not prevent recurrence. Established cell-based immunoassays revealed that he was positive for anti-MOG antibodies and negative for anti-aquaporin 4 antibodies. Conclusions: Our case report supports the relationship between anti-MOG antibodies and recurrent optic neuritis. Additional studies are needed to establish the clinical significance of anti-MOG antibodies for diagnosis, treatment, and prognosis.