The KDM5C Knockout HAP1 Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal population with targeted KDM5C gene disruption. This heterogeneous HAP1 pool supports loss-of-function investigation of the histone H3K4me3 demethylase KDM5C. The polyclonal design avoids clonal artifacts and provides a robust system for examining KDM5C-dependent transcriptional repression and chromatin remodeling. By abolishing enzyme function, the model exposes how KDM5C removes H3K4me3 to establish silenced chromatin states. It is applicable across functional genomics and epigenetic profiling workflows.
The HAP1 host cell line is a near-haploid human fibroblast-like line originating from KBM-7 chronic myeloid leukemia cells. Its adherent morphology and largely haploid karyotype permit unambiguous phenotypic readouts from single-allele perturbations, making it a premier system for haploid genetic screens. HAP1 cells are widely utilized in drug sensitivity profiling and systematic gene function mapping, while the leukemia background supplies a disease-relevant frame for studying oncogenic signaling and epigenetic programs.
KDM5C acts as a transcriptional repressor by demethylating histone H3K4me3, a key mark of active promoters. It assembles with HDAC1, HDAC2, REST, CoREST, and SIN3A in the REST?CCoREST?CHDAC corepressor complex. Regulated by upstream REST and HDAC1/2, KDM5C directs H3K4me3 erasure at neuronal gene loci including SYN1 and SCN2A, silencing their expression. This molecular circuitry links external signals to chromatin structure, governing neurodevelopmental transcriptional programs and tumor suppressive functions.
KDM5C knockout in the haploid HAP1 context lifts H3K4me3-mediated repression, causing aberrant upregulation of target genes implicated in neurodevelopment and oncogenesis. The haploid state simplifies linking KDM5C loss directly to altered chromatin and gene expression, facilitating mechanistic studies of X-linked intellectual disability (Claes-Jensen syndrome) and breast and blood cancers. This model provides a clean genetic background for parsing KDM5C??s role in maintaining repressive epigenetic landscapes and their pathological disruption.
These cells are suited for techniques such as Western blotting and immunofluorescence to monitor global H3K4me3 dynamics, ChIP-qPCR to probe locus-specific histone modifications, and RT-qPCR or RNA-seq to assess transcriptome-wide impacts on neuronal and cancer genes. They enable drug target validation for KDM5 inhibitors through cell viability and sensitivity assays, and aid modeling of epigenetic-driven disease. The knockout population serves epigenetic research, chromatin biology, and functional genomics. For further information, contact Ascent Research.
