Evolution and Comparative Physiology of Luqin-Type Neuropeptide Signaling

Frontiers in Neuroscience
Luis Alfonso Yañez-Guerra, Maurice R Elphick

Abstract

Luqin is a neuropeptide that was discovered and named on account of its expression in left upper quadrant cells of the abdominal ganglion in the mollusc Aplysia californica. Subsequently, luqin-type peptides were identified as cardio-excitatory neuropeptides in other molluscs and a cognate receptor was discovered in the pond snail Lymnaea stagnalis. Phylogenetic analyses have revealed that orthologs of molluscan luqin-type neuropeptides occur in other phyla; these include neuropeptides in ecdysozoans (arthropods, nematodes) that have a C-terminal RYamide motif (RYamides) and neuropeptides in ambulacrarians (echinoderms, hemichordates) that have a C-terminal RWamide motif (RWamides). Furthermore, precursors of luqin-type neuropeptides typically have a conserved C-terminal motif containing two cysteine residues, although the functional significance of this is unknown. Consistent with the orthology of the neuropeptides and their precursors, phylogenetic and pharmacological studies have revealed that orthologous G-protein coupled receptors (GPCRs) mediate effects of luqin-type neuropeptides in spiralians, ecdysozoans, and ambulacrarians. Luqin-type signaling originated in a common ancestor of the Bilateria as a paralog of tachykini...Continue Reading

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Citations

Jul 18, 2021·Molecular Biology and Evolution·Daniel ThielGáspár Jékely

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Datasets Mentioned

BETA
HQ709383

Methods Mentioned

BETA
amidation
PCR

Software Mentioned

IQ
aLRT
tree
MUSCLE
SH
BMGE

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