(A) Features of 3D genome re-organization during embryonic stem cell – neural progenitor – neuron/glia differentiation.
(B) Dynamic chromatin looping in response to neuronal activation, a model of signal integration for immediate early gene (IEG) and secondary response genes (SRG).
(C) A potential model for multiple inputs/activity-inducible enhancers to regulate the same downstream gene. Invariant and activity-induced loops form the hub and enable multiple enhancers to contact and regulate the same downstream gene. This process may precede transcriptional activation.
(D) A model of epigenetic priming during sequential phases of learning and memory.