Single Cell Transcriptomic Analyses Reveal the Impact of bHLH Factors on Human Retinal Organoid Development

Area of Science:

• Developmental biology
• Stem cell biology
• Neuroscience

Background:

• Retinal development relies on bHLH transcription factors, but their roles in human retinal progenitors are not fully understood.
• Human embryonic stem cell-derived retinal organoids offer a model to study these processes.

Purpose of the Study:

• Investigate the functions of bHLH factors ATOH7 and Neurog2 in human retinal organoids.
• Elucidate their impact on retinal progenitor states and neuroblast differentiation.

Main Methods:

• Single-cell transcriptome analysis of human ES cell-derived retinal organoids.
• Functional studies involving manipulation of ATOH7 and Neurog2 expression.

Main Results:

• Identified three progenitor states: pre-neurogenic, neurogenic, and cell cycle-exiting.
• ATOH7 and Neurog2 accelerate progenitor transition, expand progenitor and neuroblast populations.
• Both factors enhance retinal ganglion cell and cone photoreceptor production.
• ATOH7 and Neurog2 autoregulate and modulate other bHLH factor expression.

Conclusions:

• ATOH7 and Neurog2 are crucial regulators of human retinal progenitor development and neurogenesis.
• They influence progenitor state transitions and neuroblast fate decisions, impacting retinal cell output.