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Similarities between decapod and insect neuropeptidomes.

Jan A Veenstra1

  • 1Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (CNRS UMR5287), University of Bordeaux , Pessac , France.

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Summary

Decapod crustaceans possess highly conserved neuropeptidomes, challenging previous assumptions of species-specific differences. This study identified novel neuropeptides and suggests conserved receptor functions between insects and crustaceans.

Keywords:
Agatoxin-like peptideAndrogenic insulin-like peptideCalcitoninCrustacean female sex hormoneEvolutionNeuroparsinNeuropeptidePDHReceptor

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Area of Science:

  • Comparative genomics and transcriptomics
  • Crustacean neurobiology
  • Neuropeptide research

Background:

  • Neuropeptides regulate crucial physiological and behavioral processes.
  • Transcriptome sequencing in decapod crustaceans suggested significant interspecies neuropeptide differences.
  • The conservation of neuropeptide genes across decapod species requires further investigation.

Purpose of the Study:

  • To investigate the conservation of neuropeptide repertoires across seven decapod crustacean species.
  • To identify novel neuropeptides and neurohormones within these species.
  • To compare decapod neuropeptidomes with those of insects for evolutionary insights.

Main Methods:

  • Utilized BLAST+ for identifying neuropeptide and neurohormone-coding short reads in public archives.
  • Employed the Trinity assembler to construct complete neuropeptide precursor sequences.
  • Analyzed transcriptomic data from seven decapod species: crabs, shrimp, lobster, prawn, and crayfish.

Main Results:

  • Revealed remarkably conserved neuropeptidomes across the seven analyzed decapod species.
  • Identified a novel neuropeptide, elongated pigment-dispersing hormone (ePDH), and a potential precursor, Hyrg.
  • Confirmed the presence of most neuropeptides, even when precursors were not fully assembled.

Conclusions:

  • Decapod crustacean neuropeptidomes are highly conserved, contrary to previous suggestions of extensive differences.
  • The findings facilitate the prediction of decapod neuropeptide receptors based on deorphanized insect receptors.
  • Strong similarities between insect and decapod neuropeptidomes highlight conserved signaling pathways.