Efficient embryoid-based method to improve generation of optic vesicles from human induced pluripotent stem cells

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Ophthalmology

Background:

• Animal models are limited for studying human eye development and diseases due to species-specific differences.
• Human induced pluripotent stem cells (hiPSCs) offer a promising alternative for creating in vitro models of human oculogenesis.
• Existing methods for generating optic vesicles in vitro face challenges with low differentiation efficiency.

Purpose of the Study:

• To develop an improved protocol for generating human optic vesicle-like models using hiPSCs.
• To establish a physiologically relevant in vitro model for studying early human eye development and disorders.
• To create a pre-clinical platform for disease modeling and therapeutic testing in ophthalmology.

Main Methods:

• Adapted a retinal organoid differentiation protocol using a microwell plate to enhance embryoid body formation.
• Utilized patient-specific hiPSCs to generate three-dimensional (3D) optic vesicle-like structures.
• Analyzed morphology, gene expression (transcription factors), and protein markers (retinal progenitors) to confirm identity.

Main Results:

• Successfully generated in vitro optic vesicle/presumptive optic cup models between days 20-50 of culture.
• Confirmed model identity through established morphology and upregulation of key early eye-field transcription factors.
• Demonstrated protein expression of standard retinal progenitor markers, validating the model's developmental stage.

Conclusions:

• The adapted protocol significantly improves the efficiency of in vitro optic vesicle generation.
• These 3D hiPSC-derived models provide a physiologically relevant system for studying human oculogenesis and related diseases.
• This approach offers a valuable alternative to animal models for ocular research and drug development.