Abstract:
:Endocrine regulation in vertebrates is critical for the adaptation and regulation of homeostasis. The G protein-coupled receptor (GPCR) signaling transduction system represents one of the most ancient forms of cell surface signaling. Recently, comparative sequence analysis has aided in the identification and pairing of a variety of ligand/GPCR signaling systems. Among the ligands of type II GPCRs, the calcitonin family peptides including calcitonin, alpha-calcitonin gene-related peptide (alphaCGRP), betaCGRP, adrenomedullin, and amylin are among the best studied hormones, and the founding member, calcitonin, was originally identified and isolated from teleosts. This unique group of peptides shares a conserved tertiary structure with an N-terminal disulfide-bridged ring. In mammals, these peptides signal through two closely related type II GPCRs and three unique receptor activity-modifying proteins. Recently, based on the analysis of multiple vertebrate genomes, we identified a novel calcitonin/CGRP family peptide named intermedin. Here we show that in humans the five paralogous family genes, calcitonin, CGRP, amylin, adrenomedullin, and intermedin, evolved before the emergence of modern vertebrates, and that teleost genomes carry multiple copies of these co-evolved hormone genes. Sequence comparison showed that each of these genes is highly conserved in different vertebrates and that multiple copies of these peptides in teleosts could be derived from ancient genome duplication and/or lineage-specific intragenic duplications. The present article provides an overview of the calcitonin/intermedin family peptides found in teleost and mammalian genomes, and describes their putative functions. In addition, we demonstrate that one of the intermedin orthologs deduced from the pufferfish (Fugu rubripes) genome shares a conserved signaling activity with mammalian intermedin. The combined results indicate that the physiology associated with each of these family peptides likely evolved during early vertebrate evolution and diverged to serve select physiological functions in different vertebrates.
journal_name
Peptidesjournal_title
Peptidesauthors
Chang CL,Roh J,Hsu SYdoi
10.1016/j.peptides.2004.05.021subject
Has Abstractpub_date
2004-10-01 00:00:00pages
1633-42issue
10eissn
0196-9781issn
1873-5169pii
S0196-9781(04)00316-Xjournal_volume
25pub_type
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