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Rorβ regulates selective axon-target innervation in the mammalian midbrain.

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2019

Development. 2019 Jul 22;146(14). pii: dev171926. doi: 10.1242/dev.171926.

Rorβ regulates selective axon-target innervation in the mammalian midbrain.

H Byun;HL Lee;H Liu;D Forrest;A Rudenko;IJ Kim

Department of Ophthalmology and Visual Science, Department of Cellular and Molecular Physiology, Department of Neuroscience, Yale University School of Medicine, New Haven, CT 06511, USA. Laboratory of Endocrinology and Receptor Biology, National Institutes of Health, NIDDK, Bethesda, MD 20892, USA. Department of Biology and Graduate Program, The City College and City University of New York, New York, NY 10031, USA.

Service type: Knockout mice

Abstract

Developmental control of long-range neuronal connections in the mammalian midbrain remains unclear. We explored the mechanisms regulating target selection of the developing superior colliculus (SC). The SC is a midbrain center that directs orienting behaviors and defense responses. We discovered that a transcription factor, Rorβ, controls establishment of axonal projections from the SC to two thalamic nuclei: the dorsal lateral geniculate nucleus (dLGN) and the lateral posterior nucleus (LP). A genetic strategy used to visualize SC circuits revealed that in control animals Rorβ+ neurons abundantly innervate the dLGN but barely innervate the LP. The opposite phenotype was observed in global and conditional Rorb mutants: projections to the dLGN were strongly decreased, and projections to the LP were increased. Furthermore, overexpression of Rorb in the wild type showed increased projections to the dLGN and decreased projections to the LP. In summary, we identified Rorβ as a key developmental mediator of colliculo-thalamic innervation. Such regulation could represent a general mechanism orchestrating long-range neuronal connections in the mammalian brain.

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