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Molecular evolution of GPCRs: Secretin/secretin receptors
Janice K V Tam; Leo T O Lee; Jun Jin; Billy K C Chow

In mammals, secretin is a 27-amino acid peptide that was first studied in 1902 by Bayliss and Starling from the extracts of the jejunal mucosa for its ability to stimulate pancreatic secretion. To date, secretin has only been identified in tetrapods, with the earliest diverged secretin found in frogs. Despite being the first hormone discovered, secretin's evolutionary origin remains enigmatic, it shows moderate sequence identity in nonmammalian tetrapods but is highly conserved in mammals. Current hypotheses suggest that although secretin has already emerged before the divergence of osteichthyans, it was lost in fish and retained only in land vertebrates. Nevertheless, the cognate receptor of secretin has been identified in both actinopterygian fish (zebrafish) and sarcopterygian fish (lungfish). However, the zebrafish secretin receptor was shown to be nonbioactive. Based on the present information that the earliest diverged bioactive secretin receptor was found in lungfish, and its ability to interact with both vasoactive intestinal peptide and pituitary adenylate cyclase-activating polypeptide potently suggested that secretin receptor was descended from a VPAC-like receptor gene before the Actinopterygii-Sarcopterygii split in the vertebrate lineage. Hence, secretin and secretin receptor have gone through independent evolutionary trajectories despite their concurrent emergence post-2R. A functional secretin-secretin receptor axis has probably emerged in the amphibians. Although the pleiotropic actions of secretin are well documented in the literature, only limited information of its physiological functions in nonmammalian tetrapods have been reported. To decipher the structural and functional divergence of secretin and secretin receptor, functional characterization of the ligandreceptor pair in nonmammals would be the next perspective for investigation.

KeywordSecretin Origin Divergence Secretin Receptor Evolution
Indexed BySCI
WOS Research AreaEndocrinology & Metabolism
WOS SubjectEndocrinology & Metabolism
WOS IDWOS:000343056500007
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Cited Times [WOS]:4   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionFaculty of Health Sciences
Corresponding AuthorBilly K C Chow
AffiliationSchool of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong Correspondence
Recommended Citation
GB/T 7714
Janice K V Tam,Leo T O Lee,Jun Jin,et al. Molecular evolution of GPCRs: Secretin/secretin receptors[J]. JOURNAL OF MOLECULAR ENDOCRINOLOGY,2014,52(3):T1-T14.
APA Janice K V Tam,Leo T O Lee,Jun Jin,&Billy K C Chow.(2014).Molecular evolution of GPCRs: Secretin/secretin receptors.JOURNAL OF MOLECULAR ENDOCRINOLOGY,52(3),T1-T14.
MLA Janice K V Tam,et al."Molecular evolution of GPCRs: Secretin/secretin receptors".JOURNAL OF MOLECULAR ENDOCRINOLOGY 52.3(2014):T1-T14.
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