The EGR1 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the HAP1 haploid cell line, designed for studying immediate-early gene responses and EGR1-dependent transcriptional networks. This loss-of-function model enables robust target-gene ablation across a mixed pool, facilitating genetic dissection of EGR1 function without dependence on pharmacological inhibitors or RNA interference.
HAP1 cells are chronic myelogenous leukemia-derived haploid fibroblast-like cells originally isolated from KBM-7. With haploidy for all chromosomes except 8, these cells provide a simplified genetic background for unambiguous genotype-phenotype correlations, making them well-suited for functional genomics, high-throughput screening, and signaling pathway analysis. The absence of a second allele in most genes eliminates compensatory effects, establishing HAP1 as an ideal platform for knockout studies.
EGR1 encodes an immediate-early zinc finger transcription factor rapidly induced by EGF, FGF, PDGF, serum, TNF???, IL?1, hypoxia, and reactive oxygen species. Upstream cascades, principally the MAPK/ERK pathway (RTK?CGRB2?CSOS?CRAS?CRAF?CMEK?CERK?CELK1/SRF) and the EGFR?CPI3K?CAKT axis, converge on EGR1 activation. Upon nuclear translocation, EGR1 binds GC-rich DNA motifs and transcriptionally regulates a network including TGFB1, PDGFA, PTEN, TP53, BCL2, CCND1, MMP2, MMP9, and VEGF. EGR1 function is modulated by interactions with NAB1, NAB2, CREBBP, EP300, SP1, FOS, JUN, and NF???B, positioning it at the intersection of mitogenic, survival, and stress pathways with context-dependent tumor suppressor or oncogene activities.
Disruption of EGR1 in the haploid HAP1 background provides a clean system to dissect its role in signaling without allelic interference. Given the leukemic origin, this model is especially relevant for investigating EGR1??s dual role in cancer, where it can mediate apoptosis/growth arrest or proliferation/survival. The knockout enables examination of EGR1-regulated genes controlling cell cycle, apoptosis, and migration, supporting mechanistic oncogenesis studies.
This polyclonal knockout population suits diverse applications: immediate-early gene functional analysis, MAPK/ERK and TGF??? pathway dissection, transcriptional reporter assays, and drug screening targeting stress pathways. Assays include western blotting, RT?qPCR, ChIP?qPCR, phospho?flow cytometry, immunofluorescence, and cell proliferation/apoptosis/migration experiments, applicable to cardiovascular, neurodegenerative, and fibrotic disease models. Contact Ascent Research for details.
