Non-thalamic origin of zebrafish sensory nuclei implies convergent evolution of visual pathways in amniotes and teleosts

Ascending visual projections similar to the mammalian thalamocortical pathway are found in a wide range of vertebrate species, but their homology is debated. To get better insights into their evolutionary origin, we examined the developmental origin of a thalamic-like sensory structure of teleosts,...

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Bibliographic Details
Published in:eLife 2020-09, Vol.9
Main Authors: Bloch, Solal, Hagio, Hanako, Thomas, Manon, Heuzé, Aurélie, Hermel, Jean-Michel, Lasserre, Elodie, Colin, Ingrid, Saka, Kimiko, Affaticati, Pierre, Jenett, Arnim, Kawakami, Koichi, Yamamoto, Naoyuki, Yamamoto, Kei
Format: Article
Language:English
Subjects:
Animals
Biological Evolution
Cell Lineage
Cognitive Sciences
Embryo, Nonmammalian - embryology
forebrain
homology
Life Sciences
midbrain
Neurobiology
Neurons and Cognition
Neuroscience
Psychology and behavior
Thalamic Nuclei - embryology
thalamus
vertebrates
visual pathway
Visual Pathways - embryology
Zebrafish - embryology
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Summary:Ascending visual projections similar to the mammalian thalamocortical pathway are found in a wide range of vertebrate species, but their homology is debated. To get better insights into their evolutionary origin, we examined the developmental origin of a thalamic-like sensory structure of teleosts, the preglomerular complex (PG), focusing on the visual projection neurons. Similarly to the tectofugal thalamic nuclei in amniotes, the lateral nucleus of PG receives tectal information and projects to the pallium. However, our cell lineage study in zebrafish reveals that the majority of PG cells are derived from the midbrain, unlike the amniote thalamus. We also demonstrate that the PG projection neurons develop gradually until late juvenile stages. Our data suggest that teleost PG, as a whole, is not homologous to the amniote thalamus. Thus, the thalamocortical-like projections evolved from a non-forebrain cell population, which indicates a surprising degree of variation in the vertebrate sensory systems.
ISSN:2050-084X
2050-084X
DOI:10.7554/elife.54945