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Characterization of Tbr2-expressing retinal ganglion cells.
- Source :
-
The Journal of comparative neurology [J Comp Neurol] 2021 Oct; Vol. 529 (15), pp. 3513-3532. Date of Electronic Publication: 2021 Jul 16. - Publication Year :
- 2021
-
Abstract
- The mammalian retina contains more than 40 retinal ganglion cell (RGC) subtypes based on their unique morphologies, functions, and molecular profiles. Among them, intrinsically photosensitive RGCs (ipRGCs) are the first specified RGC type emerging from a common retinal progenitor pool during development. Previous work has shown that T-box transcription factor T-brain 2 (Tbr2) is essential for the formation and maintenance of ipRGCs, and that Tbr2-expressing RGCs activate Opn4 expression upon native ipRGC ablation, suggesting that Tbr2 <superscript>+</superscript> RGCs contain a reservoir for ipRGCs. However, the identity of Tbr2 <superscript>+</superscript> RGCs has not been fully vetted. Here, using genetic sparse labeling and single cell recording, we showed that Tbr2-expressing retinal neurons include RGCs and a subset of GABAergic displaced amacrine cells (dACs). Most Tbr2 <superscript>+</superscript> RGCs are intrinsically photosensitive and morphologically resemble native ipRGCs with identical retinofugal projections. Tbr2 <superscript>+</superscript> RGCs also include a unique and rare Pou4f1-expressing OFF RGC subtype. Using a loss-of-function strategy, we have further demonstrated that Tbr2 is essential for the survival of these RGCs and dACs, as well as maintaining the expression of Opn4. These data set a strong foundation to study how Tbr2 regulates ipRGC development and survival, as well as the expression of molecular machinery regulating intrinsic photosensitivity.<br /> (© 2021 Wiley Periodicals LLC.)
- Subjects :
- Animals
Dendrites chemistry
Dendrites metabolism
Female
Gene Expression
Male
Mice
Mice, 129 Strain
Mice, Inbred C57BL
Mice, Transgenic
Retinal Ganglion Cells chemistry
T-Box Domain Proteins analysis
Retinal Ganglion Cells metabolism
T-Box Domain Proteins biosynthesis
T-Box Domain Proteins genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1096-9861
- Volume :
- 529
- Issue :
- 15
- Database :
- MEDLINE
- Journal :
- The Journal of comparative neurology
- Publication Type :
- Academic Journal
- Accession number :
- 34245014
- Full Text :
- https://doi.org/10.1002/cne.25208