Role of theEGR2promoter antisense RNA in modulating chromatin accessibility and spatial genome organization

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 EGR2 and 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.