Three-dimensional (3D) retinal organoids, in vitro tissue structures derived from self-organizing cultures of differentiating human embryonic stem cells or induced pluripotent stem cells, could recapitulate some aspects of the cytoarchitectural structure and function of the retina in vivo. 3D retinal organoids display huge potential for the investigation of the pathogenesis of monogenic hereditary eye diseases that are related to the malfunction or degeneration of photoreceptors or retinal ganglion cells by providing an effective in vitro tool with multiple applications. In combination with recent genome editing tools, 3D retinal organoids could also represent a reliable and renewable source of transplantable cells for personalized therapies. In this review, we describe the recent advances in human pluripotent stem cells-derived retinal organoids, determination of their histoarchitecture, complexity, and maturity. We also discuss their application as a means to decipher the pathogenesis of retinal diseases, as well as the main drawbacks and challenges. Stem Cells 2019;37:1496-1504.

Department of Tissue Cultures and Stem Cells Czech Academy of Science Institute of Experimental Medicine Prague Czech Republic

National Stem Cell Bank Valencia Node Proteomics Genotyping and Cell Line Platform PRB3 ISCIII Research Centre Principe Felipe Valencia Spain

Stem Cells Therapies in Neurodegenerative Diseases Lab Centro de Investigación Principe Felipe Valencia Spain

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