PUBLICATION

The Zebrafish Amygdaloid Complex - Functional Ground Plan, Molecular Delineation, and Everted Topology

Authors
Porter, B.A., Mueller, T.
ID
ZDB-PUB-200810-22
Date
2020
Source
Frontiers in neuroscience   14: 608 (Journal)
Registered Authors
Mueller, Thomas
Keywords
amygdala, emotion, hippocampus, isocortex, prefrontal cortex, prethalamic eminence, telencephalon, teleost
MeSH Terms
none
PubMed
32765204 Full text @ Front. Neurosci.
Abstract
In mammals and other tetrapods, a multinuclear forebrain structure, called the amygdala, forms the neuroregulatory core essential for emotion, cognition, and social behavior. Currently, higher circuits of affective behavior in anamniote non-tetrapod vertebrates ("fishes") are poorly understood, preventing a comprehensive understanding of amygdala evolution. Through molecular characterization and evolutionary-developmental considerations, we delineated the complex amygdala ground plan of zebrafish, whose everted telencephalon has made comparisons to the evaginated forebrains of tetrapods challenging. In this radical paradigm, thirteen telencephalic territories constitute the zebrafish amygdaloid complex and each territory is distinguished by conserved molecular properties and structure-functional relationships with other amygdaloid structures. Central to our paradigm, the study identifies the teleostean amygdaloid nucleus of the lateral olfactory tract (nLOT), an olfactory integrative structure that links dopaminergic telencephalic groups to the amygdala alongside redefining the putative zebrafish olfactory pallium ("Dp"). Molecular characteristics such as the distribution of substance P and the calcium-binding proteins parvalbumin (PV) and calretinin (CR) indicate, that the zebrafish extended centromedial (autonomic and reproductive) amygdala is predominantly located in the GABAergic and isl1-negative territory. Like in tetrapods, medial amygdaloid (MeA) nuclei are defined by the presence of substance P immunoreactive fibers and calretinin-positive neurons, whereas central amygdaloid (CeA) nuclei lack these characteristics. A detailed comparison of lhx5-driven and vGLut2a-driven GFP in transgenic reporter lines revealed ancestral topological relationships between the thalamic eminence (EmT), the medial amygdala (MeA), the nLOT, and the integrative olfactory pallium. Thus, the study explains how the zebrafish amygdala and the complexly everted telencephalon topologically relate to the corresponding structures in mammals indicating that an elaborate amygdala ground plan evolved early in vertebrates, in a common ancestor of teleosts and tetrapods.
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Mutations / Transgenics
Allele Construct Type Affected Genomic Region
b1205TgTransgenic Insertion
    rw0TgTransgenic Insertion
      zf139TgTransgenic Insertion
        zf177TgTransgenic Insertion
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          Antibodies
          Name Type Antigen Genes Isotypes Host Organism
          Ab1-GABApolyclonal
            Rabbit
            Ab1-thmonoclonalIgG1Mouse
            Ab5-calb2polyclonal
              Rabbit
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              Engineered Foreign Genes
              Marker Marker Type Name
              EGFPEFGEGFP
              EYFPEFGEYFP
              GFPEFGGFP
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