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Retinal Degeneration Caused by Ago2 Disruption.
Xue-Jiao Chen1, Chang-Jun Zhang2, Ya-Han Wang1,2
1School of Ophthalmology & Optometry and Eye Hospital, Wenzhou Medical University, Wenzhou, China.
Investigative Ophthalmology & Visual Science
|September 16, 2021
Summary
Argonaute 2 (Ago2) disruption severely damages mouse retinas, causing morphological changes and functional decline. Maintaining Ago2 levels is crucial for retinal health and function.
Area of Science:
- Molecular Biology
- Genetics
- Ophthalmology
Background:
- Argonaute proteins regulate gene silencing via small RNAs.
- Ago2, a key Argonaute member, possesses slicer activity vital for microRNA homeostasis and development.
- The role of Ago2 in retinal structure and function is not fully understood.
Purpose of the Study:
- To investigate the function of Ago2 in the mouse retina.
- To determine the impact of Ago2 dysregulation on retinal morphology and function.
Main Methods:
- An adeno-associated virus-mediated Ago2 disruption mouse model was utilized.
- Retinal function was assessed using electroretinography (ERG).
- Retinal structure was analyzed via spectral domain optical coherence tomography, fundus photography, and immunostaining. Noncoding RNA expression was quantified using RT-PCR.
Main Results:
- Both Ago2 silencing and overexpression led to significant retinal morphological alterations.
- Severe impairment of retinal function, characterized by a thinned outer nuclear layer, shortened photoreceptor inner/outer segments, and diminished ERG responses, was observed.
- Ago2 disruption altered noncoding RNA expression in the retina.
Conclusions:
- Ago2 interruption causes severe retinal degeneration.
- Ago2 homeostasis is essential for maintaining retinal structural integrity and function.
