Dynamic reorganization of Developmental to Adult Genome Topology Controls the Initiation and Stabilization of the Human Muscle Stem Cell State
Romero, M. A.; Chien, P.; Nicoletti, C.; Liliom, H. L.; Cox, G.; Skuratovsky, E.; Saleh, K.; Gibbs, D.; Gane, L.; Hoang, D.-H.; Caputo, L.; Massenet, J.; Sobreira, D. R.; Puri, P. L.; Pyle, A. D.
Show abstract
Developmental gene expression is under tight temporal and spatial control. This regulation is imparted by tissue specific enhancers that integrate developmental signals into transcriptional responses to allow for developmental progression. Often species specific, the enhancers that regulate human muscle progenitor and stem cell gene expression are currently unknown. Here, we define the 3D chromatin organization of human muscle development and reveal key changes across the human genome that are associated with multiple layers of 3D genome reorganization during the transition from a more progenitor-like to muscle stem cell state, including a reduction of TAD numbers and an increase in CTCF binding at TAD boundaries and chromatin loops throughout developmental progression. Specifically, we found that increased CTCF occupancy at human enhancers of PAX7 in stem cells holds enhancer-promoter (e-p) loops for timely activation of PAX7 enhancers during early human development. These findings demonstrate that stem cell state acquisition is stabilized earlier than previously known and provide unprecedented insights into the initiation and control of the muscle stem cell state in humans.
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