Somatostatin- and urotensin II-related peptides: molecular diversity and evolutionary perspectives
作者： J.Michael Conlon , Herve Tostivint , Hubert Vaudry
DOI: 10.1016/S0167-0115(97)02135-6
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摘要: Abstract Recent advances in the fields of molecular cloning and peptide purification necessitate a reappraisal our views concerning evolution genes encoding somatostatin-related peptides. The currently widely held view that genomes tetrapods contain only preprosomatostatin-I (PSS-I) gene, somatostatin-14, with second preprosomatostatin gene being expressed teleost fish is no longer tenable. Identification both somatostatin-14 peptide, cortistatin mammals, identification PSS-I PSS-II amphibia, isolation products from at least two non-allelic lampreys suggests alternative hypothesis duplication occurred early evolution, predating or concomitant appearance chordates. We speculate somatostatin are all classes vertebrates but these have evolved very different rates. It probable preprosomatostatin-II (PSS-II) [Tyr7,Gly10]somatostatin-14 related arose independent ancestor present-day time after divergence stock line leading to tetrapods. recent urotensin II, which contains region structural similarity not evolutionarily central nervous systems lampreys, elasmobranchs amphibia necessitates we modify accepted II exclusively product caudal neurosecretory system fish.
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