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Gene expression of neuronal soluble N ‐ethylmaleimide‐sensitive factor attachment protein receptor complex components in the olfactory organ and brain during seaward and homeward migration by pink salmon ( Oncorhynchus gorbuscha )
Author(s) -
Abe Takashi,
Koshino Yosuke,
Watanabe Tomoharu,
Miyakoshi Yasuyuki,
Yoshida Yuji,
Kudo Hideaki
Publication year - 2020
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.14543
Subject(s) - biology , olfactory bulb , cerebrum , olfactory epithelium , olfactory system , oncorhynchus , olfactory receptor , olfactory nerve , central nervous system , neuroscience , microbiology and biotechnology , anatomy , fishery , fish <actinopterygii>
The expression of synaptic vesicle exocytosis‐regulator SNARE complex component genes ( snap25 , stx1 and vamp2 ) was examined in the olfactory nervous system during seaward and homeward migration by pink salmon ( Oncorhynchus gorbuscha ). The expression levels of snares in the olfactory organ were higher in seaward fry than in feeding and homeward adults, reflecting the development of the olfactory nervous system. The expression of snap25a , b and stx1a was upregulated or stable in the adult olfactory bulb and telencephalon. This upregulated expression suggested alterations in olfactory neuronal plasticity that may be related to the discrimination of natal rivers. The expression of stx1b was downregulated in the adult olfactory bulb, but remained stable in the adult telencephalon. The expression of vamp2 was initially strong in seaward fry, but was downregulated in adults in both the olfactory bulb and telencephalon. Pink salmon has the lowest diversity of maturation age, the largest population, and the most evolutional position in Pacific salmon (genus Oncorhynchus ). The expression of snares in the olfactory center of pink salmon reflected the timing of sexual maturation and homeward migration. The present results and our previous studies indicate that snares show distinct expression patterns between two salmon species that depend on physiological and ecological features of migration.