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- W1996252015 abstract "Gonadotrophin-releasing hormone (GnRH) is considered to have an important role in the control of reproduction in salmonid fish, although we do not have any direct evidence. To clarify this problem by molecular techniques, we first determined the nucleotide sequence of the mRNA encoding the precursor of salmon-type GnRH (sGnRH) from the masu salmon, Oncorhynchus masou. The masu salmon sGnRH precursor was composed of a signal peptide, sGnRH and a GnRH-associated peptide (GAP) which was connected to sGnRH by a Gly-Lys-Arg sequence. The amino acid sequence of sGnRH and Gly-Lys-Arg were highly conserved when compared with the corresponding regions of African cichlid sGnRH and mammalian GnRH precursors. However, the GAP region was markedly divergent, with a 66% amino acid similarity to African cichlid GAP and an 8·3–15% similarity to mammalian GAPs. Northern blot analysis indicated the presence of a single mRNA species of about 600 bases in the olfactory bulb and telencephalon and in the diencephalon. The signal was more intense in the former regions. An in-situ hybridization study further revealed that sGnRH neurones were distributed in the olfactory nerve, the ventral part of the olfactory bulb, the ventral part of the telencephalon, the lateral preoptic area and the preoptic nucleus. The sGnRH neurones were thus longitudinally scattered between the olfactory nerve and the lateral preoptic area in the rostroventral part of brain. The intensity of the hybridization signals and the size of hybridization-positive somata were much greater in the olfactory nerve and the rostral olfactory bulb than in the other regions. Preoptic sGnRH neurones were scarcely detected in immature masu salmon, whereas they were more frequently observed in maturing animals. It is possible that the olfactory and the preoptic sGnRH neurones have different physiological roles in salmonid fish." @default.
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- W1996252015 date "1992-08-01" @default.
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- W1996252015 title "Characterization and localization of mRNA encoding the salmon-type gonadotrophin-releasing hormone precursor of the masu salmon" @default.
- W1996252015 doi "https://doi.org/10.1677/jme.0.0090073" @default.
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