ArticleCell and tissue research2021
Smoothened overexpression causes trochlear motoneurons to reroute and innervate ipsilateral eyes.
Article in Cell and tissue research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed, 13 citations in OpenAlex.
- Molecular Cascades That Build and Connect Auditory Neurons from Hair Cells to the Auditory Cortex.Journal of experimental neurology · 2025Article
- Harmony in the Molecular Orchestra of Hearing: Developmental Mechanisms from the Ear to the Brain.Annual review of neuroscience · 2024Review
- Evolution and development of extraocular motor neurons, nerves and muscles in vertebrates.Annals of anatomy = Anatomischer Anzeiger : official organ of the Anatomische Gesellschaft · 2024Review
- Gene networks and the evolution of olfactory organs, eyes, hair cells and motoneurons: a view encompassing lancelets, tunicates and vertebrates.Frontiers in cell and developmental biology · 2024Review
- The evolution of the various structures required for hearing inIBRO neuroscience reports · 2023Article
- Molecular mechanisms governing development of the hindbrain choroid plexus and auditory projection: A validation of the seminal observations of Wilhelm His.IBRO neuroscience reports · 2022Review
- Conserved subcortical processing in visuo-vestibular gaze control.Nature communications · 2022Article
- Eya2 expression during mouse embryonic development revealed by Eya2Developmental dynamics : an official publication of the American Association of Anatomists · 2021Article
- An Integrated Perspective of Evolution and Development: From Genes to Function to Ear, Lateral Line and Electroreception.Diversity · 2021Article
Corrections and comments
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Authors and funding
4 authors at 1 institution in 1 country.
Funding
Abstract
The trochlear projection is unique among the cranial nerves in that it exits the midbrain dorsally to innervate the contralateral superior oblique muscle in all vertebrates. Trochlear as well as oculomotor motoneurons uniquely depend upon Phox2a and Wnt1, both of which are downstream of Lmx1b, though why trochlear motoneurons display such unusual projections is not fully known. We used Pax2-cre to drive expression of ectopically activated Smoothened (SmoM2) dorsally in the midbrain and anterior hindbrain. We documented the expansion of oculomotor and trochlear motoneurons using Phox2a as a specific marker at E9.5. We show that the initial expansion follows a demise of these neurons by E14.5. Furthermore, SmoM2 expression leads to a ventral exit and ipsilateral projection of trochlear motoneurons. We compare that data with Unc5c mutants that shows a variable ipsilateral number of trochlear fibers that exit dorsal. Our data suggest that Shh signaling is involved in trochlear motoneuron projections and that the deflected trochlear projections after SmoM2 expression is likely due to the dorsal expression of Gli1, which impedes the normal dorsal trajectory of these neurons.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.