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Onecut1 is essential for horizontal cell genesis and retinal integrity.
Fuguo Wu1, Renzhong Li, Yumiko Umino
1Department of Ophthalmology/Ross Eye Institute and Developmental Genomics Group, New York State Center of Excellence in Bioinformatics and Life Sciences, University at Buffalo, Buffalo, New York 14203, USA.
Onecut 1 (Oc1) is crucial for horizontal cell (HC) development in the retina. Loss of Oc1 prevents HC formation, impacting photoreceptor survival and visual function.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Horizontal cells (HCs) are key interneurons in the outer retina, essential for visual processing.
- HC development is regulated by a hierarchy of transcription factors.
- Onecut 1 (Oc1) is a transcription factor expressed in developing HCs and retinal ganglion cells (RGCs).
Purpose of the Study:
- To investigate the role of Oc1 in retinal development and HC genesis.
- To elucidate the genetic network governing HC development involving Oc1.
- To determine the impact of HC dysfunction on photoreceptor survival and retinal integrity.
Main Methods:
- Generation of Oc1-specific retinal knock-out mice.
- In utero electroporation to study HC fate determination.
- Analysis of retinal cell types, gene expression, and synaptic connections.
- Assessment of photoreceptor survival and retinal integrity in Oc1-null mice.
Main Results:
- Oc1 knockout resulted in an approximately 80% failure of HC formation, confirming Oc1's essential role in HC genesis.
- Oc1 functions downstream of FoxN4, in parallel with Ptf1a, and upstream of Lim1 and Prox1 in the HC developmental pathway.
- Oc1 and Ptf1a are both essential and sufficient for determining HC fate.
- Oc1 deficiency led to defective outer plexiform layer synapses and age-dependent photoreceptor degeneration.
- HCs are vital for photoreceptor viability and overall retinal integrity.
Conclusions:
- Oc1 is a critical determinant of horizontal cell fate during retinal development.
- Horizontal cells are indispensable for photoreceptor survival, retinal integrity, and normal visual function.
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