Journal
JOURNAL OF COMPARATIVE NEUROLOGY
Volume 527, Issue 12, Pages 2009-2029Publisher
WILEY
DOI: 10.1002/cne.24648
Keywords
Robo3; commissures; amniotes; development; evolution; inferior olive; pontine nucleus; habenula
Categories
Funding
- National Health and Medical Research Council [GNT1035093, GNT1120615]
- Australian Research Council [DE160101394, DP160103958]
- Agence Nationale de la Recherche [ANR-10-LABX-65, ANR-11-IDEX-0004-02, ANR-14-CE13-0004-01]
- Australian Research Council [DE160101394] Funding Source: Australian Research Council
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In Bilaterians, commissural neurons project their axons across the midline of the nervous system to target neurons on the opposite side. In mammals, midline crossing at the level of the hindbrain and spinal cord requires the Robo3 receptor which is transiently expressed by all commissural neurons. Unlike other Robo receptors, mammalian Robo3 receptors do not bind Slit ligands and promote midline crossing. Surprisingly, not much is known about Robo3 distribution and mechanism of action in other vertebrate species. Here, we have used whole-mount immunostaining, tissue clearing and light-sheet fluorescent microscopy to study Robo3 expression pattern in embryonic tissue from diverse representatives of amniotes at distinct stages, including squamate (African house snake), birds (chicken, duck, pigeon, ostrich, emu and zebra finch), early postnatal marsupial mammals (fat-tailed dunnart), and eutherian mammals (mouse and human). The analysis of this rich and unique repertoire of amniote specimens reveals conserved features of Robo3 expression in midbrain, hindbrain and spinal cord commissural circuits, which together with subtle but meaningful modifications could account for species-specific evolution of sensory-motor and cognitive capacities. Our results also highlight important differences of precerebellar nuclei development across amniotes.
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