GEOapplication/xmlftp://ftp.ncbi.nlm.nih.gov/geo/series/GSE338nnn/GSE338848/primaryOK200GenomicsDrosophila melanogasterGenome binding/occupancy profiling by high throughput sequencinghttps://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE338848GEOGSEfalseA comprehensive HA-tagged PRC1 toolkit enables standardized chromatin profiling and proteomic analysis in Drosophila melanogaster [CUT&Run]Polycomb group (PcG) proteins are evolutionarily conserved epigenetic regulators that maintain transcriptional states during development and are frequently misregulated in disease. Here, we generated a comprehensive collection of endogenously HA-tagged alleles for the core components of Polycomb Repressive Complex 1 (PRC1) and additional chromatin regulators in Drosophila melanogaster using CRISPR/Cas9-mediated genome engineering. We show that endogenous HA tagging preserves protein expression, chromatin localization, and genome-wide binding profiles, enabling direct comparison using a common, commercially available antibody to analyze distinct PcG subunits. Proteomic analyses recovered known components of canonical and non-canonical PRC1 and PRC2 complexes and identified additional PcG-associated factors. Notably, multiple components of the nuclear pore complex (NPC) were detected as PcG interactors, and genetic analyses confirmed a functional interaction between them. This resource provides a platform for standardized analysis of Polycomb function and chromatin regulation that can readily be extended to other chromatin regulatory complexes and applied across different developmental stages.2026/08/17GSE338848GSM9883410GSM9883411GSM9883402GSM9883403GSM9883404GSM9883405GSM9883406GSM9883407GSM9883408GSM988340921306338848Drosophila melanogaster