Abstract
Serotonergic cells are among the earliest neurons to be born in the developing central nervous system and serotonin is known to regulate the development of the nervous system. One of the major targets of the activity of serotonergic cells is the serotonin 1A receptor (5-HT1A), an ancestral archetypical serotonin receptor. In this study, we cloned and characterized the 3D structure of the sea lamprey 5-HT1A, and studied the expression of its transcript in the central nervous system by means of in situ hybridization. In phylogenetic analyses, the sea lamprey 5-HT1A sequence clustered together with 5-HT1A sequences of vertebrates and emerged as an outgroup to all gnathostome sequences. In situ hybridization analysis during prolarval, larval and adult stages showed a widespread expression of the lamprey 5-ht1a transcript. In P1 prolarvae 5-ht1a mRNA expression was observed in diencephalic nuclei, the rhombencephalon and rostral spinal cord. At P2 prolarval stage the 5-ht1a expression extended to other brain areas including telencephalic regions. 5-ht1a expression in larvae was observed throughout almost all the main brain regions with the strongest expression in the olfactory bulbs, lateral pallium, striatum, preoptic region, habenula, prethalamus, thalamus, pretectum, hypothalamus, rhombencephalic reticular area, dorsal column nucleus and rostral spinal cord. In adults, the 5-ht1a transcript was also observed in cells of the subcommissural organ. Comparison of the expression of 5-ht1a between the sea lamprey and other vertebrates reveals a conserved pattern in most of the brain regions, likely reflecting the ancestral vertebrate condition.
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Abbreviations
- 5-HT:
-
Serotonin (5-hydroxytryptamine)
- 5-HTR:
-
Serotonin receptor
- 5-ht1a:
-
Serotonin 1A receptor gene
- 5-HT1A:
-
Serotonin 1A receptor protein
- ir:
-
Immunoreactive
- P0–P23:
-
0–23 days post-hatching prolarvae
- CSF-c:
-
Cerebrospinal fluid-contacting
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Acknowledgments
This work was supported by grants from the Xunta de Galicia (INCITE08PXIB200063PR) and the Spanish Ministry of Science and Education (BFU2010-17174).
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Cornide-Petronio, M.E., Anadón, R., Barreiro-Iglesias, A. et al. Serotonin 1A receptor (5-HT1A) of the sea lamprey: cDNA cloning and expression in the central nervous system. Brain Struct Funct 218, 1317–1335 (2013). https://doi.org/10.1007/s00429-012-0461-y
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DOI: https://doi.org/10.1007/s00429-012-0461-y