Mega-Enhancer Bodies Organize Neuronal Long Genes in the Cerebellum
Zhao, Z.; Parra, O. P.; Muscella, F.; Alber, F.; Scrutton-Alvarado, N.; Muscella, F.; Yang, Y.; Yamada, T.
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Exceptionally long genes and cis-regulatory enhancers are selectively activated in mammalian brain neurons, and these loci are mutation hotspots in neurological disorders. However, the organization of these large genomic elements at the level of chromosome folding, beyond local enhancer-promoter interactions, remains poorly understood. Here, we report the discovery of a nuclear subcompartment in the mouse cerebellum formed by near-megabase long enhancers and their associated long genes encoding synaptic or signaling proteins. Genomic regions within this subcompartment reside in the outer-half of the nucleus, separated from other transcriptionally active structures. Using an in vivo CRISPR genetic mini-screen, we uncover a specific role for the transcription factor Etv1 in coupling the compartmentalization of neuronal long genes with their expression. Together, our study defines mechanisms that organize transcriptionally active genes across chromosomes in the mammalian brain.
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