The JUN Knockout HAP1 Polyclonal Cells product comprises a CRISPR/Cas9-edited polyclonal population of HAP1 cells with targeted disruption of the JUN gene, providing a loss-of-function model for c-Jun. The polyclonal format offers a heterogeneous knockout pool for bulk functional assays, enabling rapid investigation of AP-1 transcriptional activity without clone isolation.
HAP1 is a near-haploid human cell line (male) derived from KBM-7 chronic myeloid leukemia cells, exhibiting adherent fibroblast-like morphology. Its near-haploid genome simplifies knockout generation, as single-allele disruption allows complete gene inactivation. HAP1 retains major signaling pathways and is widely used for genetic knockout studies in cancer biology and stress signaling.
c-Jun is a basic leucine zipper transcription factor that dimerizes with Fos, ATF, or JUN proteins to form the AP-1 complex, which binds TRE/AP-1 response elements and regulates genes including cyclin D1, MMP-1, MMP-9, VEGF, and Bcl-2 family members. Its transcriptional activity is primarily controlled by JNK (MAPK8/9/10)-mediated phosphorylation at Ser63 and Ser73, downstream of growth factors, inflammatory cytokines, and stresses such as UV radiation and oxidative stress. ERK (MAPK1/3) and p38 (MAPK14) also contribute to c-Jun regulation. c-Jun functionally interfaces with WNT/??-catenin and TGF-??/SMAD pathways through interactions with ??-catenin and SMAD3.
In HAP1 cells, JUN knockout provides a clean system to dissect c-Jun-dependent transcription in a leukemic background. HAP1 retains intact MAPK cascades, making it suitable for studying c-Jun??s roles in proliferation, apoptosis, differentiation, and stress responses. The loss of c-Jun abolishes AP-1 transcriptional output, enabling identification of downstream targets and pathway dependencies. This model is valuable for drug resistance research, as c-Jun is implicated in chemoresistance, and for screening modulators of AP-1 activity. The near-haploid genome ensures that phenotypes are directly attributable to JUN disruption.
Key applications include functional genomics by RNA-seq or RT-qPCR comparing parental and knockout transcriptomes; stress signaling analysis via western blot or phospho-c-Jun immunofluorescence; and transcriptional studies using ChIP-qPCR or luciferase reporters. Cancer biology applications encompass proliferation, apoptosis (Annexin V), and migration/invasion assays to assess c-Jun??s role in tumor cell behavior. This model also supports studies in inflammatory signaling and fibrotic responses. For further details, please contact Ascent Research.
