Retinal ganglion cell-specific genetic regulation in primary open-angle glaucoma.

Area of Science:

• Genomics
• Ophthalmology
• Stem Cell Biology

Background:

• Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness.
• Understanding the genetic underpinnings of POAG is crucial for developing effective treatments.
• Induced pluripotent stem cells (iPSCs) offer a powerful model for studying disease-specific cellular mechanisms.

Purpose of the Study:

• To investigate the transcriptomic profile of disease-specific cell populations in POAG.
• To identify novel genetic associations contributing to POAG pathogenesis.
• To explore the utility of iPSC-derived retinal organoids for glaucoma research.

Main Methods:

• Fibroblasts from POAG patients and healthy controls were reprogrammed into iPSCs.
• iPSCs were differentiated into retinal organoids.
• Single-cell RNA sequencing (scRNA-seq) was performed on 247,520 cells.
• Expression quantitative trait mapping (eQTM) and transcriptome-wide association studies (TWAS) were conducted.

Main Results:

• scRNA-seq identified distinct molecular signatures in retinal cell populations.
• eQTM identified 4,443 significant genetic loci, with 312 specific to retinal ganglion cells.
• TWAS implicated 97 statistically significant retinal ganglion cell-specific eQTMs, including genes at known POAG loci.

Conclusions:

• Large-scale iPSC studies can uncover context-specific molecular profiles for complex genetic diseases like POAG.
• This study identified novel genetic associations and cell-type-specific regulatory loci relevant to POAG.
• The findings provide valuable insights into the genetic architecture of POAG and highlight potential therapeutic targets.