Single-cell transcriptomics and RNAi screening define a hierarchical program of planarian eye regeneration

Area of Science:

• Developmental Biology
• Regenerative Medicine
• Genetics

Background:

• Eye evolution and disease are complex biological challenges.
• Planarians offer a unique model for studying eye regeneration due to their remarkable ability to regrow eyes after injury.

Purpose of the Study:

• To define the hierarchical sequence of cellular and genetic events during planarian eye regeneration.
• To identify key genes controlling each stage of eye development and regeneration.

Main Methods:

• Single-cell transcriptomic analysis of regenerating eyes.
• Large-scale RNA interference (RNAi) screening to assess gene function.

Main Results:

• A step-by-step genetic program for eye regeneration was elucidated, from progenitor cell specification to photoreceptor and optic cup cell differentiation.
• Key processes including rhabdomere formation, dorsal projection development, and eye morphogenesis were characterized.
• The role of conserved genes and extracellular environment interactions in forming a transparent optical region was highlighted.

Conclusions:

• The study establishes a comprehensive framework for understanding organ regeneration, specifically focusing on the conserved genetic mechanisms underlying eye development.
• This research provides foundational knowledge for investigating human eye diseases and advancing regenerative therapies.