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• W3090400462 abstract "Abstract Background Nervous systems originated before the split of Proto- and Deuterostomia, more than 600 million years ago. Four animal phyla (Cnidaria, Placozoa, Ctenophora, Porifera) diverged before this split and studying these phyla could give us important information on the evolution of the nervous system. Here, we have annotated the neuropeptide preprohormone genes of twenty species belonging to the subclass Hexacorallia or Ceriantharia (Anthozoa: Cnidaria), using thirty-seven publicly accessible genome or transcriptome databases. Studying hexacorals is important, because they are versatile laboratory models for development (e.g., Nematostella vectensis ) and symbiosis (e.g., Exaiptasia diaphana ) and also are prominent reef-builders. Results We found that each hexacoral or ceriantharian species contains five to ten neuropeptide preprohormone genes. Many of these preprohormones contain multiple copies of immature neuropeptides, which can be up to 50 copies of identical or similar neuropeptide sequences. We also discovered preprohormones that only contained one neuropeptide sequence positioned directly after the signal sequence. Examples of them are neuropeptides that terminate with the sequence RWamide (the Antho-RWamides). Most neuropeptide sequences are N-terminally protected by pyroglutamyl (pQ) or one or more prolyl residues, while they are C-terminally protected by an amide group. Previously, we isolated and sequenced small neuropeptides from hexacorals that were N-terminally protected by an unusual L-3-phenyllactyl group. In our current analysis, we found that these N-phenyllactyl-peptides are derived from N-phenylalanyl-peptides located directly after the signal sequence of the preprohormone. The N-phenyllactyl- peptides appear to be confined to the hexacorallian order Actiniaria and do not occur in other cnidarians. On the other hand, (1) the neuropeptide Antho-RFamide (pQGRFamide); (2) peptides with the C-terminal sequence GLWamide; and (3) tetrapeptides with the X 1 PRX 2 amide consensus sequence (most frequently GPRGamide) are ubiquitous in Hexacorallia. Conclusions We found GRFamide, GLWamide, and X 1 PRX 2 amide peptides in all tested Hexacorallia. Previously, we discovered these three neuropeptide classes also in Cubozoa, Scyphozoa, and Staurozoa, indicating that these neuropeptides originated in the common cnidarian ancestor and are evolutionarily ancient. In addition to these ubiquitous neuropeptides, other neuropeptides appear to be confined to specific cnidarian orders or subclasses." @default.
• W3090400462 created "2020-10-08" @default.
• W3090400462 creator A5014536777 @default.
• W3090400462 creator A5043006822 @default.
• W3090400462 date "2020-09-29" @default.
• W3090400462 modified "2023-10-10" @default.
• W3090400462 title "A comparative genomics study of neuropeptide genes in the cnidarian subclasses Hexacorallia and Ceriantharia" @default.
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• W3090400462 doi "https://doi.org/10.1186/s12864-020-06945-9" @default.
• W3090400462 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7523074" @default.
• W3090400462 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32993486" @default.
• W3090400462 hasPublicationYear "2020" @default.
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