Single Cell Transcriptomics Identifies Distinct Choroid Cell Populations Involved in Visually Guided Eye Growth

Area of Science:

• Ophthalmology and developmental biology
• Cellular and molecular biology
• Genomics and transcriptomics

Background:

• Postnatal ocular growth, or emmetropization, minimizes refractive error through coordinated tissue development.
• The ocular choroid is implicated in emmetropization by producing scleral growth regulators.
• Understanding choroidal cell function is crucial for elucidating refractive development.

Approach:

• Utilized single-cell RNA sequencing (scRNA-seq) to profile chick choroid cell populations.
• Analyzed gene expression changes in choroidal cells during emmetropization.
• Employed UMAP clustering to identify and characterize distinct cell clusters.

Key Points:

• Identified 24 distinct cell clusters, including fibroblasts, endothelial cells, immune cells, Schwann cells, and melanocytes.
• Significant gene expression changes were observed in 17 cell clusters (95% of total cells).
• A rare neuronal cell population, expressing neuron-specific and opsin genes, showed the most significant expression changes.

Conclusions:

• Provided a comprehensive cellular and gene expression profile of the chick choroid during emmetropization.
• Identified a potentially light-sensitive neuronal cell population involved in regulating ocular growth.
• Gained insights into pathways coordinating postnatal ocular development and refractive error control.