METTL3 uncouples chromatin accessibility from transcription during retinal development.

ABSTRACT: METTL3 is a key regulator of RNA metabolism, yet its genomic and epitranscriptomic roles in tissue development are largely unexplored. Using embryonic stem cell-derived 3D retinal organoids to model retinal progenitor cell (RPC) differentiation, we integrated transcriptome-wide m6A profiling (GLORI), protein-DNA (chromatin immunoprecipitation sequencing [ChIP-seq] and CUT&RUN) and chromatin accessibility (ATAC-seq) mapping, and targeted m6A engineering (dCas13b-FTO) to dissect METTL3 function. Loss of METTL3 nuclear m6A activity disrupted Rx+ retinal anlage formation in vitro, with dCas13b-FTO epitranscriptome engineering revealing that m6A at the Six3 3'UTR governs its stability. Surprisingly, while METTL3 loss altered histone modifications and chromatin accessibility, its direct chromati

SUBMITTER: Xu J 

PROVIDER: S-EPMC12790738 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature