GEOapplication/xmlftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE295nnn/GSE295473/primaryOK200OtherMus musculusOtherhttps://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE295473GEOGSEfalsePolycomb Chromatin Topology Enables Long-Range Enhancer Recruitment during Craniofacial Development [PCHi-C]Little is known about how three-dimensional chromatin topology shapes mammalian craniofacial development. In mouse cranial neural crest cells, a Polycomb Repressive Complex 2 (PRC2)-dependent chromatin architecture is established before migration. This configuration maintains craniofacial gene promoters poised and connects them with distal Polycomb tethering elements, positioning promoters in spatial proximity to future long-range enhancers. Deletion of Ezh2 disrupts this early topology, causing inappropriate gene derepression in post-migratory craniofacial subpopulations where these genes are normally silenced, and failure of long-range enhancer recruitment where activation is required, thereby impairing proper gene expression. We further identify a distal Polycomb tethering element essential for Hoxa2 enhancer recruitment across topologically associating domains. Thus, Polycomb acts not only as a transcriptional repressor, but also as a chromatin-folding organizer that prepares developmental genes for later activation, by facilitating subsequent recruitment of distal active enhancers previously not in contact. Polycomb-mediated topology therefore orchestrates the transition from progenitor plasticity to precise spatiotemporal control of morphogenetic gene programs during neural crest development and face formation.2026/04/08GSE295473GSM8950959GSM8950965GSM8950954GSM8950953GSM8950964GSM8950963GSM8950952GSM9557552GSM8950951GSM9557551GSM8950962GSM8950969GSM8950958GSM8950968GSM8950957GSM8950967GSM8950956GSM8950966GSM8950955GSM8950961GSM8950950GSM8950971GSM8950960GSM895097019057295473Mus musculus