Appearance of Myelin proteins during vertebrate evolution - PubMed (original) (raw)
Appearance of Myelin proteins during vertebrate evolution
T V Waehneldt et al. Neurochem Int. 1986.
Abstract
Myelin, defined as an arrangement of spirally fused unit membranes, is an acquisition of vertebrates and first appeared during evolution in Gnathostomata. In all species studied PNS and CNS myelins contain the myelin-associated glycoprotein (MAG) and the myelin basic protein (MBP). Throughout phylogeny PNS myelin is characterized by the major P(0) glycoprotein which is called IP in fishes. The PNS myelin proteins did not evolve further except for the addition of P(2) protein from reptiles onward. In Elasmobranchii and Chondrostei, PNS and CNS myelin proteins are similar. CNS myelin of actinopterygian fishes possesses a 36,000 Da protein (36K) in addition to P(0)-like IP glycoproteins. In tetrapod CNS myelin, P(0) is replaced by the proteolipid protein (PLP) and the Wolfgram protein (WP). Of particular interest in a transitional phylogenetic sense are the lungfish Protopterus, carrying glycosylated PLP (g-PLP) but no P(0), 36K or WP, and the bichir Polypterus, showing simultaneous presence of P(0), 36K and PLP. These results indicate that myelin proteins could be valuable molecular markers in establishing vertebrate phylogenetic relationships and in reconstructing the fish-tetrapod transition.
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