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Myelin gangliosides in vertebrates
Journal of Neurochemistry
|September 1, 1982
Summary
Brain myelin ganglioside patterns vary across 16 vertebrate species. Mammals primarily feature GM1 gangliosides, while birds show GM1 and GM4, and fish/amphibians have low concentrations.
Area of Science:
- Neuroscience
- Biochemistry
- Evolutionary Biology
Background:
- Gangliosides are crucial glycosphingolipids in vertebrate myelin.
- Understanding their phylogenetic distribution offers insights into myelin evolution and function.
Purpose of the Study:
- To conduct a phylogenetic survey of brain myelin ganglioside patterns and concentrations.
- To compare ganglioside profiles across diverse vertebrate species.
Main Methods:
- Purification of myelin from the brains of 16 vertebrate species.
- Isolation and quantification of gangliosides using sialic acid measurements.
- Analysis of ganglioside composition, focusing on GM1 and GM4.
Main Results:
- Ganglioside concentrations varied widely, from 25 µg/100 mg myelin (goldfish) to 395 µg/100 mg (turkey).
- Mammals predominantly showed GM1, with GM4 varying (20-25% in rhesus monkeys and humans, <10% in others).
- Fish and amphibians had low ganglioside content with little GM1 and no GM4; alligators showed high concentrations with di- and trisialo gangliosides.
Conclusions:
- Vertebrate brain myelin ganglioside composition exhibits significant phylogenetic variation.
- GM1 is the dominant ganglioside in mammals, suggesting a conserved role.
- Distinct ganglioside profiles in fish, amphibians, birds, and reptiles highlight evolutionary adaptations in myelin composition.