Role of the EGR2 promoter antisense RNA in modulating chromatin accessibility and spatial genome organization
Moreno, M.-M.; Karambizi, D.; Hwang, H.; Fregoso, K.; Chen, J.-S.; Fajardo, J. E.; Fiser, A.; Tapinos, N.
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The EGR2 promoter antisense RNA (AS-RNA) recruits chromatin remodeling complexes to inhibit EGR2 transcription following peripheral nerve injury. Here we show that the EGR2-AS-RNA modulates chromatin accessibility and interacts with two distinct histone modification complexes. It binds to EZH2 and WDR5 and enables targeting of H3K27me3 and H3K4me3 to promoters of EGR2and C-JUN respectively. Expression of the AS-RNA results in reorganization of the global chromatin landscape and quantitative changes in loop formation and in contact frequency at domain boundaries exhibiting enrichment for AP-1 genes. In addition, the EGR2-AS-RNA induces changes in hierarchical TADs and increases transcription factor occupancy on an inter-TAD loop between a super-enhancer regulatory hub and the promoter of mTOR. Our results show that the EGR2-AS-RNA may serve as regulator of chromatin remodeling and spatial genome organization in Schwann cells.
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