Summary.
The lancelet (amphioxus), a cephalochordate, is the closest invertebrate relative to vertebrates, with a simple vertebrate-like body plan and a prototypical genome. We have determined D-aspartic acid (D-Asp) and major free L-amino acids (L-AAs) content in the nervous system (neural tube) of the European amphioxus Branchiostoma lanceolatum, and have compared these values with those of molluscs and human brain. The B. lanceolatum neural tube contains relatively high amounts of L-Glu, L-Asp, L-Ala and L-Gly. Thus, the amphioxus neural tube has in common with the molluscan and human nervous systems the presence of appreciable amounts of L-Glu and L-Asp, which suggests that they are the most common neurotransmitters among these phylogenetically distant animal groups. The relatively high concentration of L-Ala in amphioxus is consistent with that found in molluscs and the low concentration of taurine is consistent with that described in the human brain.
The D-Asp concentration, very high in the molluscan nervous system, was rather low in amphioxus, although a little higher than the extremely low amounts observed in the human brain. Our data on free amino acids composition is in agreement with the intermediate phylogenetic position of cephalochordates, in terms of the evolutionary transition from simple to complex neural systems.
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D’Aniello, S., Garcia-Fernàndez, J. D-Aspartic acid and L-amino acids in the neural system of the amphioxus Branchiostoma lanceolatum . Amino Acids 32, 21–26 (2007). https://doi.org/10.1007/s00726-006-0347-5
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DOI: https://doi.org/10.1007/s00726-006-0347-5