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pt point mutation in plp gene results in hyperexpression of MOG in hypomyelinated rabbit
1Department of Neurochemistry, Medical Research Centre, Polish Academy of Science, Warsaw, Poland.
Abstract:
Myelin/oligodendrocyte glycoprotein (MOG) is a minor myelin protein that belongs to the immunoglobulin gene superfamily and evokes demyelination based on immunological response. Localized preferentially at the external surfaces of myelin sheaths, it is one of the primarily target autoantigens in experimental autoimmune encephalomyelitis (EAE), an animal model for multiple sclerosis. Elevated MOG content has been found in the myelin fraction of the rabbits affected by the mild form of paralytic tremor (pt) disease, evoked by natural, point mutation in exon 2 of plp gene. A single T-->A transversion results in substitution of histidine36 by glutamine in PLP and it's splicing variant DM-20 molecules. The affected animals, although strictly controlled for pt trait, differ significantly in their phenotypes, distinguished by the severity of neurological symptoms. It was shown that the degree of CNS hypomyelination and deficiency of PLP/DM-20 correlates well with the severity of neurological symptoms and is highest in the most strongly affected animals. Variety of phenotypes generated from pt genotype together with previously observed MOG hyperexpression suggested possible contribution of immunological component to the pt disease. Present studies indicate that MOG expression depends both on the phenotype and the age of affected rabbits and most probably mirrors retardation in myelinogenesis process caused by pt mutation.
Insights
Myelin/oligodendrocyte glycoprotein (MOG) hyperexpression in rabbits with a PLP gene mutation suggests an immune response contributes to varying neurological symptoms and hypomyelination in paralytic tremor disease.
Area of Science:
- Neuroimmunology
- Molecular Genetics
- Animal Models of Neurological Disease
Background:
- Myelin/oligodendrocyte glycoprotein (MOG) is a key autoantigen in demyelinating diseases like multiple sclerosis.
- The paralytic tremor (pt) disease in rabbits is linked to a mutation in the proteolipid protein (PLP) gene, affecting PLP and DM-20.
- Varied disease severity in pt rabbits suggests additional factors beyond the primary mutation.
Purpose of the Study:
- To investigate the role of MOG in the pathogenesis of paralytic tremor (pt) disease.
- To explore the relationship between MOG expression, phenotype severity, and myelin defects in pt rabbits.
- To determine if an immunological component contributes to the varied neurological presentations in pt rabbits.
Main Methods:
- Analysis of MOG content in myelin fractions of affected rabbits.
- Correlation of MOG expression levels with neurological symptom severity and CNS hypomyelination.
- Assessment of MOG expression in relation to rabbit age and phenotype.
Main Results:
- Elevated MOG levels were observed in rabbits with paralytic tremor (pt) disease.
- MOG expression correlated with both the phenotype and age of the affected rabbits.
- Increased MOG expression appears to mirror delayed myelinogenesis caused by the pt mutation.
Conclusions:
- The findings suggest an immunological contribution to paralytic tremor (pt) disease, potentially involving MOG.
- MOG hyperexpression may serve as an indicator of myelinogenesis retardation in pt rabbits.
- Further research is warranted to elucidate the precise mechanisms of MOG involvement in this neurological condition.