A research team led by Associate Professor Taito Matsuda from the Nara Institute of Science and Technology in Japan reported on Mar. 9 that an enzyme called Setd8 plays a key role in maintaining retinal progenitor cells (RPCs) during eye development. The findings were published online on January 29, 2026, and appeared in Volume 21, Issue 2 of Stem Cell Reports on February 10, 2026.
The study is significant as it addresses how RPCs retain their ability to become various types of retinal neurons before eventually transforming into supporting Müller glia cells. Once this transformation occurs, the retina loses its capacity to regenerate lost neurons, which is a concern as retinal diseases become more common with aging populations.
Researchers isolated mouse RPCs at different developmental stages and used genome-wide sequencing to analyze gene expression and chromatin accessibility. Their results identified Setd8 as crucial for preserving the progenitor state in these cells. Experiments with genetically engineered mice lacking Setd8 showed reduced cell proliferation, increased DNA damage, higher cell death rates, thinner retinas, and fewer late-developing neurons.
Further analysis revealed that without Setd8, chromatin regions normally open in RPCs closed off, leading to decreased activity of genes important for maintaining progenitor identity and DNA repair. "These insights are relevant to regenerative medicine and ophthalmology, where understanding and manipulating epigenetic mechanisms could contribute to the development of novel therapeutic strategies for vision restoration," remarks Matsuda.
By identifying an enzyme that helps keep RPCs flexible and stem cell-like, the study points toward possible future treatments for damaged retinas. "Our laboratory focuses on cellular reprogramming that can flexibly alter cell fate, so we are happy about the clarified part of the mechanism that supports retinal progenitor identity. Future research will aid in achieving newer regeneration therapies," concludes Matsuda.
