ArticleStem cell reports2026
Histone methyltransferase Setd8 preserves chromatin accessibility to safeguard retinal progenitor cell identity during development.
Article in Stem cell reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Dynamic epigenetic changes guide retinal progenitor cells (RPCs) toward diverse neuronal subtypes and Müller glia during retinal development. However, the epigenetic mechanisms that maintain RPC proliferative and neurogenic potential throughout the final stages of retinal cell genesis remain poorly understood. Here, we integrate RNA sequencing and assay for transposase-accessible chromatin sequencing (ATAC-seq) to investigate how mouse RPC progenitor competence is regulated. Our analysis reveals conserved chromatin accessibility and gene expression profiles in mouse RPCs throughout retinal cell genesis. Notably, the histone methyltransferase Setd8, which catalyzes H4K20 monomethylation, remains persistently expressed in RPCs but is barely detectable in adult Müller glia. Setd8 deletion in developing RPCs reduces proliferation, triggers apoptosis, and disrupts retinal laminar organization and ocular axis length. Additionally, Setd8 deficiency impairs the chromatin accessibility that is normally preserved in RPCs, leading to a partial acquisition of a transcriptomic profile associated with terminally differentiated cells. Our study indicates that Setd8 safeguards mouse RPC identity by maintaining RPC-specific chromatin accessibility, thereby ensuring proper retinal development.
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