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Updated: May 12, 2026
Dissection and Immunohistochemistry of Larval, Pupal and Adult Drosophila Retinas
Published on: November 14, 2012
Dicer is essential for proper maturation, composition, and function in the postnatal retina
Abstract:
microRNAs (miRNAs) play a pivotal role during the early phases of retinal development, but their impact on late-phase retinogenesis is unknown. We depleted miRNAs in late retinal progenitor/precursor cells (RPCs/PCs) via a conditional Dicer knock-out. Optical coherence tomography (OCT), electroretinography (ERG), histological, and transcriptional analyses were conducted in young and adult mice. Alterations in gene expression of late-born cells were observed as early as postnatal day 7 (P7), resulting in impaired rod function, a significantly reduced number of rod bipolar cells and their associated function, and a decreased Müller glia population at adult age. These defects appear to be caused by a delay in differentiation/ incomplete maturation, as indicated by an enlarged progenitor/precursor population at young ages that persists into adulthood. Notably, an increased population of HuC/D+ amacrine cells was found. Luciferase assays led us to speculate that this increase may be due to the absence of Elavl3 suppression via RPC-miRNAs. This suggests that Dicer/miRNAs in late RPC/PCs are essential for the proper formation and maturation of late RPC progenies and may also play a role in regulating cell state.
Summary Statement:
Late-retinal progenitor microRNAs are essential for proper postnatal retinogenesis and retinal function.
Insights
Late-acting microRNAs (miRNAs) in retinal progenitor cells are crucial for proper eye development and function. Depleting these miRNAs impairs rod function and cell populations, affecting vision.
Area of Science:
- Developmental biology
- Neuroscience
- Ophthalmology
Background:
- microRNAs (miRNAs) are key regulators of early retinal development.
- The role of miRNAs in late-phase retinogenesis remains largely unknown.
Purpose of the Study:
- To investigate the impact of miRNA depletion in late retinal progenitor/precursor cells (RPCs/PCs) on postnatal retinogenesis and retinal function.
Main Methods:
- Conditional Dicer knock-out in late RPCs/PCs of mice.
- Analyses included optical coherence tomography (OCT), electroretinography (ERG), histology, and transcriptional profiling.
- Luciferase assays were used to investigate gene regulation.
Main Results:
- miRNA depletion caused altered gene expression in late-born retinal cells by postnatal day 7 (P7).
- Observed defects included impaired rod function, reduced rod bipolar cells, and decreased Müller glia population in adult mice.
- A persistent enlarged progenitor/precursor population suggested delayed differentiation and incomplete maturation. Increased HuC/D+ amacrine cells were noted, potentially due to lack of *Elavl3* suppression.
Conclusions:
- Dicer/miRNAs in late RPCs/PCs are essential for the proper formation and maturation of their progeny.
- These miRNAs play a critical role in regulating cell state during late retinogenesis and maintaining retinal function.
