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Axonal projections originating from raphe serotonergic neurons in the developing and adult zebrafish, Danio rerio, using transgenics to visualize raphe-specific pet1 expression. H₂O.
J. Comp. Neurol. 512, 158-182 (2008)
Serotonin is a major central nervous modulator of physiology and behavior and plays fundamental roles during development and plasticity of the vertebrate central nervous system (CNS). Understanding the developmental control and functions of serotonergic neurons is therefore an important task. In all vertebrates, prominent serotonergic neurons are found in the superior and inferior raphe nuclei in the hindbrain innervating most CNS regions. In addition, all vertebrates except for mammals harbor other serotonergic centers, including several populations in the diencephalon. This, in combination with the intricate and wide distribution of serotonergic fibers, makes it difficult to sort out serotonergic innervation originating from the raphe from that of other serotonergic cell populations. To resolve this issue, we isolated the regulatory elements of the zebrafish raphe-specific gene pet1 and used them to drive expression of an eGFP transgene in the raphe population of serotonergic neurons. With this approach together with retrograde tracing we 1) describe in detail the development, anatomical organization, and projection pattern of zebrafish pet1-positive neurons compared with their mammalian counterparts, 2) identify a new serotonergic population in the ventrolateral zebrafish hindbrain, and 3) reveal some extent of functional subdivisions within the zebrafish superior raphe complex. Together, our results reveal for the first time the specific innervation pattern of the zebrafish raphe and, thus, provide a new model and various tools to investigate further the role of raphe serotonergic neurons in vertebrates.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
raphe; pet1; serotonin; 5-HT; green fluorescent protein
Language
english
Publication Year
2008
HGF-reported in Year
2009
ISSN (print) / ISBN
0021-9967
e-ISSN
1096-9861
Quellenangaben
Volume: 512,
Issue: 2,
Pages: 158-182
Publisher
Wiley
Reviewing status
Peer reviewed
Institute(s)
Institute of Developmental Genetics (IDG)
POF-Topic(s)
30501 - Systemic Analysis of Genetic and Environmental Factors that Impact Health
PSP Element(s)
G-500100-001
PubMed ID
19003874
Scopus ID
58249089086
Erfassungsdatum
2009-06-16