PeerJ. 2021 Jul 14;9:e11799. doi: 10.7717/peerj.11799. eCollection 2021.
Ambulacrarian insulin-related peptides and their putative receptors suggest how insulin and similar peptides may have evolved from insulin-like growth factor.
PeerJ
Jan A Veenstra
Affiliations
Affiliations
- INCIA UMR 5287 CNRS, Université de Bordeaux, Pessac, Gironde, France.
PMID: 34316411
PMCID: PMC8286064 DOI: 10.7717/peerj.11799
Abstract
BACKGROUND: Some insulin/IGF-related peptides (irps) stimulate a receptor tyrosine kinase (RTK) that transfers the extracellular hormonal signal into an intracellular response. Other irps, such as relaxin, do not use an RTK, but a G-protein coupled receptor (GPCR). This is unusual since evolutionarily related hormones typically either use the same or paralogous receptors. In arthropods three different irps, i.e. arthropod IGF, gonadulin and
METHODOLOGY: Genes encoding irps as well as their putative receptors were identified in genomes and transcriptomes from echinoderms and hemichordates.
RESULTS: A similar triplet of genes coding for irps also occurs in some ambulacrarians. Two of these are orthologs of arthropod IGF and dilp7 and the third is likely a gonadulin ortholog. In echinoderms, two novel irps emerged, gonad stimulating substance (GSS) and multinsulin, likely from gene duplications of the IGF and dilp7-like genes respectively. The structures of GSS diverged considerably from IGF, which would suggest they use different receptors from IGF, but no novel irp receptors evolved. If IGF and GSS use different receptors, and the evolution of GSS from a gene duplication of IGF is not associated with the appearance of a novel receptor, while irps are known to use two different types of receptors, the ancestor of GSS and IGF might have acted on both types of receptors while one or both of its descendants act on only one. There are three ambulacrarian GPCRs that have amino acid sequences suggestive of being irp GPCRs, two of these are orthologs of the gonadulin and dilp7 receptors. This suggests that the third might be an IGF receptor, and that by deduction, GSS only acts on the RTK. The evolution of GSS from IGF may represent a pattern, where IGF gene duplications lead to novel genes coding for shorter peptides that activate an RTK. It is likely this is how insulin and the insect neuroendocrine irps evolved independently from IGF.
CONCLUSION: The local gene triplication described from arthropods that yielded three genes encoding irps was already present in the last common ancestor of protostomes and deuterostomes. It seems plausible that irps, such as those produced by neuroendocrine cells in the brain of insects and echinoderm GSS evolved independently from IGF and, thus, are not true orthologs, but the result of convergent evolution.
©2021 Veenstra.
Keywords: Dilp7; Evolution; GPCR; Gonadulin; IGF; Insulin; Multinsulin; Octinsulin; Receptor tyrosine kinase; Relaxin
Conflict of interest statement
The author declares that he has no competing interests.
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