title: AmphiD1/beta, a dopamine D1/beta-adrenergic receptor from the amphioxus Branchiostoma floridae: evolutionary aspects of the catecholaminergic system during development.
abstract: Catecholamine receptors mediate wide-ranging functions in vertebrates and invertebrates but are largely unknown in invertebrate chordates such as amphioxus. Catecholaminergic cells have been described in amphioxus adults, but few data are known about the transmembrane signal transduction pathways and the expression pattern of related receptors during development. In Branchiostoma floridae, we cloned a full-length cDNA (AmphiD1/beta) that corresponds to the dopamine D1/beta receptor previously cloned from a related species of amphioxus, Branchiostoma lanceolatum, but no expression studies have been performed for such receptor in amphioxus. In B. floridae, AmphiD1/beta encodes a polypeptide with typical G-protein-coupled receptor features, characterized by highest sequence similarity with D1 dopamine and beta-adrenergic receptors. The expression of AmphiD1/beta mRNA in different regions of the cerebral vesicle corresponds to that of D1-like receptors in vertebrate homologous structures. Furthermore, in situ experiments show that during development, the expression in the nervous system is restricted to cells located anteriorly. A further expression was found in larvae at the level of the endostyle, but it has no counterpart in the predominant expression domains of vertebrate dopamine and/or adrenergic receptor genes. At the same time, we compared the dopaminergic system, consisting of AmphiTH-expressing cells, with the AmphiD1/beta expression. In conclusion, the identification of the AmphiD1/beta receptor provides further basis for understanding the evolutionary history of the dopaminergic system at the transition from invertebrates and vertebrates.
authors.affiliation: Dipartimentodi Biologia, Università di Genova, Genova, Italy.
authors.forename: Simona
authors.initials: S
authors.lastname: Candiani
authors.forename: Diana
authors.initials: D
authors.lastname: Oliveri
authors.forename: Manuela
authors.initials: M
authors.lastname: Parodi
authors.forename: Patrizio
authors.initials: P
authors.lastname: Castagnola
authors.forename: Mario
authors.initials: M
authors.lastname: Pestarino
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002395:Catecholamines / Q000235:genetics / Q000378:metabolism*; D002816:Chordata, Nonvertebrate / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics / Q000378:metabolism; D004625:Embryo, Nonmammalian; D019143:Evolution, Molecular; D018507:Gene Expression Regulation, Developmental; D007814:Larva / Q000166:cytology / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D011943:Receptors, Adrenergic, beta / Q000235:genetics*; D017447:Receptors, Dopamine D1 / Q000235:genetics* / Q000378:metabolism; D017421:Sequence Analysis
chemical_list: D002395:Catecholamines; D018076:DNA, Complementary; D011943:Receptors, Adrenergic, beta; D017447:Receptors, Dopamine D1