The ING1 Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal cell population harboring targeted disruption of the ING1 tumor suppressor gene within the HAP1 host cell background. This pooled knockout model provides a genetically heterogeneous population for functional studies, avoiding clonal selection biases while maintaining robust gene inactivation. By abrogating ING1 expression, researchers can dissect its roles in cell cycle regulation, apoptosis, senescence, and p53-dependent transcriptional programs.
HAP1 is a near-haploid human cell line originally derived from the KBM-7 chronic myeloid leukemia (CML) line in blast crisis. Its haploid karyotype simplifies genetic manipulation and phenotypic analysis, as only a single allele requires disruption to achieve functional knockout. This attribute, combined with rapid growth and amenability to high-content screening, makes HAP1 an invaluable platform for functional genomics and drug discovery applications in cancer biology.
ING1 is a type II tumor suppressor that functions as a stoichiometric cofactor enhancing p53 transcriptional activity. In response to genotoxic stress, such as ??-irradiation, ING1 is phosphorylated by the ATM/ATR kinases and acetylated by p300/PCAF, facilitating its interaction with p53. ING1 forms complexes with p300/CBP, PCNA, HDAC1, SAP30, Sin3A, and 14-3-3 proteins, acting as a molecular scaffold that promotes p53 acetylation and stabilizes p53 binding to chromatin. This enhances expression of downstream effectors including the cyclin-dependent kinase inhibitor p21/CDKN1A, pro-apoptotic factors Bax and PUMA, and the DNA repair-associated gene GADD45, thereby coordinating cell cycle arrest, apoptosis, and senescence. ING1 also interacts with Lamin A/C, linking p53 responses to nuclear architecture.
In the context of HAP1??s near-haploid genome, ING1 knockout provides a clean loss-of-function model to delineate its tumor-suppressive mechanisms without interference from a second functional allele. The polyclonal nature ensures a broad representation of editing events, enabling robust statistical analysis and reducing the impact of off-target effects that might arise in clonal isolates. This model is particularly relevant for investigating ING1??s role in cancers such as breast, gastric, melanoma, and glioblastoma, where its dysfunction contributes to tumorigenesis.
Researchers can utilize ING1 Knockout HAP1 Polyclonal Cells in a wide array of assays to evaluate p53-dependent and -independent functions. Typical experimental approaches include Western blotting and RT-qPCR to assess ING1 and its target gene expression (p21, Bax), cell proliferation assays (MTS/MTT) to examine growth defects, Annexin V staining and caspase-3 activity assays for apoptosis quantification, senescence-associated ??-galactosidase staining to detect cellular aging, and clonogenic survival assays following DNA-damaging agents such as ??-irradiation. DNA damage response can be monitored by ??-H2AX foci formation. The cells are also suitable for ChIP-qPCR to analyze p53 promoter occupancy. For further details or to discuss custom applications, please contact Ascent Research.
