Summary
This study used single-cell RNA sequencing to characterize 24 distinct cell populations in the chick choroid and their gene expression changes during visually guided eye growth (emmetropization), revealing that 95% of choroidal cells show significant transcriptomic responses. Notably, a rare neuronal cell population (0.11–0.49% of cells) expressing opsin genes was identified, suggesting the choroid may directly sense light to regulate ocular elongation — a finding with potential implications for understanding how lighting environments influence myopia development.
Key Findings
- scRNA-seq identified 24 distinct cell clusters in chick choroids, including 7 fibroblast subpopulations, 5 endothelial cell populations, 4 immune cell clusters, 3 Schwann cell subpopulations, 2 melanocyte clusters, and single populations of RBCs, plasma cells, and neurons.
- Significant gene expression changes between control and treated choroids were found in 17 of 24 cell clusters, representing ~95% of total choroidal cells.
- The majority of gene expression changes were less than 2-fold in magnitude.
- A rare neuronal cell population comprising only 0.11%–0.49% of total choroidal cells showed the highest gene expression changes and expressed multiple opsin genes, suggesting potential intrinsic light sensitivity in the choroid.
Categories
Eye Health & Vision: Investigates choroidal cell populations and gene expression changes involved in emmetropization and refractive error development.
The Science of Light: Identifies a rare neuronal choroidal cell population expressing opsin genes suggestive of intrinsic light sensitivity, with implications for light-driven eye growth regulation.
Author(s)
JA Summers, KL Jones
Publication Year
2023
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