PUBLICATION

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

Authors
Bloch, S., Hagio, H., Thomas, M., Heuzé, A., Hermel, J.M., Lasserre, E., Colin, I., Saka, K., Affaticati, P., Jenett, A., Kawakami, K., Yamamoto, N., Yamamoto, K.
ID
ZDB-PUB-200909-5
Date
2020
Source
eLIFE   9: (Journal)
Registered Authors
Affaticati, Pierre, Colin, Ingrid, Hermel, Jean-Michel, Jenett, Arnim, Kawakami, Koichi, Yamamoto, Kei
Keywords
forebrain, homology, midbrain, neuroscience, thalamus, vertebrates, visual pathway, zebrafish
MeSH Terms
  • Animals
  • Biological Evolution*
  • Cell Lineage*
  • Embryo, Nonmammalian/embryology
  • Thalamic Nuclei/embryology*
  • Visual Pathways/embryology*
  • Zebrafish/embryology*
PubMed
32896272 Full text @ Elife
Abstract
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.
Genes / Markers
Figures
Expression
Phenotype
Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping
Errata and Notes