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Published on: October 27, 2017
Reprogramming Glial Cell Metabolism via a tRNA Fragment Preserves Vision in Retinal Neurodegeneration
Yuke Ji1,2, Sha Liu1, Ying Zhang1
1Department of Ophthalmology and Optometry The Affiliated Eye Hospital Nanjing Medical University Nanjing China.
Medcomm
|July 24, 2026
Summary
A novel RNA fragment, 5'tiRNA-His-GTG, drives retinal neurodegeneration by promoting inflammation and cell death. Inhibiting this fragment preserves vision and offers a new therapeutic target for vision loss.
Area of Science:
- Ophthalmology
- Neuroscience
- Molecular Biology
Background:
- Retinal neurodegeneration causes irreversible vision loss via retinal ganglion cell (RGC) death.
- Effective neuroprotective therapies are currently unavailable.
- Small non-coding RNAs are implicated in CNS injury, but their role in retinal neurodegeneration is unclear.
Purpose of the Study:
- To investigate the role of tRNA-derived fragments in retinal neurodegeneration.
- To identify novel molecular mechanisms and therapeutic targets for vision loss.
Main Methods:
- Utilized mouse models of retinal neurodegeneration.
- Quantified 5'tiRNA-His-GTG levels.
- Assessed the functional impact of 5'tiRNA-His-GTG inhibition on RGC survival, glial activation, and visual function.
- Investigated the underlying molecular mechanisms involving LPCAT1 and phosphatidylcholine (PC) metabolism.
Main Results:
- Elevated 5'tiRNA-His-GTG levels were observed in retinal neurodegeneration models.
- 5'tiRNA-His-GTG promotes reactive gliosis and RGC degeneration via Müller cell-RGC crosstalk.
- Inhibition of 5'tiRNA-His-GTG protected RGCs, improved visual function, and rescued vision-dependent behaviors.
- Mechanistically, 5'tiRNA-His-GTG suppresses LPCAT1, disrupting phosphatidylcholine biosynthesis and glycerophospholipid metabolism.
- Restoring LPCAT1 or PC levels reversed the neurodegenerative effects.
Conclusions:
- Identified a novel 5'tiRNA-His-GTG-LPCAT1-PC pathway contributing to retinal neurodegeneration.
- 5'tiRNA-His-GTG is a key mediator of glial-driven neuroinflammation and RGC loss.
- This signaling axis represents a potential therapeutic target for treating retinal neurodegenerative diseases.
