Expression of a Novel D4 Dopamine Receptor in the Lamprey Brain. Evolutionary Considerations about Dopamine Receptors

Frontiers in Neuroanatomy
Juan Pérez-FernándezM A Pombal

Abstract

Numerous data reported in lampreys, which belong to the phylogenetically oldest branch of vertebrates, show that the dopaminergic system was already well developed at the dawn of vertebrate evolution. The expression of dopamine in the lamprey brain is well conserved when compared to other vertebrates, and this is also true for the D2 receptor. Additionally, the key role of dopamine in the striatum, modulating the excitability in the direct and indirect pathways through the D1 and D2 receptors, has also been recently reported in these animals. The moment of divergence regarding the two whole genome duplications occurred in vertebrates suggests that additional receptors, apart from the D1 and D2 previously reported, could be present in lampreys. We used in situ hybridization to characterize the expression of a novel dopamine receptor, which we have identified as a D4 receptor according to the phylogenetic analysis. The D4 receptor shows in the sea lamprey a more restricted expression pattern than the D2 subtype, as reported in mammals. Its main expression areas are the striatum, lateral and ventral pallial sectors, several hypothalamic regions, habenula, and mesencephalic and rhombencephalic motoneurons. Some expression areas are...Continue Reading

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Citations

Dec 23, 2016·Frontiers in Neuroanatomy·Daniel Romaus-SanjurjoMaría Celina Rodicio
Jan 7, 2021·Cell Reports·Shreyas M SuryanarayanaSten Grillner
Aug 28, 2021·Journal of Personalized Medicine·Taichi OchiSvetlana A Ivanova

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Datasets Mentioned

BETA
EAW67225
BAI70438
ABH06893
ABH06894

Methods Mentioned

BETA
PCRs
PCR
in vitro transcription
electron microscopy

Software Mentioned

BLAT Search
MEGA
Genscan
Ensembl
ClustalW
blast
OCTOPUS
SMART
Basic Local Alignment Search Tool ( BLAST
GENSCAN Server

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