Oligodendrocyte Precursor Cells Shape Retinogeniculate Refinement Via a CHD8-Dependent Phagocytic Pathway.
Siyue Wen1, Fengru Guo1, Zhidan Li1
1Center for Translational Medicine, Key Laboratory of Birth Defects and Related Disease of Women and Children of MOE, State Key Laboratory of Biotherapy, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, People's Republic of China.
Investigative Ophthalmology & Visual Science
|March 31, 2026
Summary
Oligodendrocyte precursor cells (OPCs) prune excess synapses in the visual system during eye opening. The gene Chd8 regulates this process, and its disruption is linked to autism.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Synaptic refinement is crucial for visual system development, particularly around eye opening.
- Identifying the glial cells and molecular mechanisms governing synaptic pruning is essential.
Purpose of the Study:
- Identify the primary glial phagocyte responsible for synaptic elimination in the dorsal lateral geniculate nucleus (dLGN) during eye opening.
- Elucidate the molecular regulation of this phagocytic process.
Main Methods:
- Utilized 3D imaging to assess glial engulfment capacity.
- Performed in vivo cell ablation to confirm roles in synaptic pruning.
- Conducted differential transcriptomic and single-cell sequencing analyses.
- Employed conditional knockout mice and in vivo electrophysiology.
Main Results:
- Oligodendrocyte precursor cells (OPCs) were identified as the major phagocytes of excess synapses in the dLGN.
- A distinct OPC subpopulation highly expressing phagocytic genes was found, enriched for the autism-associated gene Chd8.
- CHD8 was shown to directly promote phagocytosis-related gene transcription.
- Chd8 ablation led to synaptic surplus and visual function abnormalities.
Conclusions:
- OPC-mediated synaptic phagocytosis, regulated by CHD8, is critical for visual development.
- Disruption of this CHD8-driven pathway contributes to synaptic abnormalities and is implicated in autism pathology.
