DNASE1L1 Knockout HAP1 Polyclonal Cells provide a powerful CRISPR/Cas9-edited polyclonal knockout cell population derived from the HAP1 human near-haploid cell line, designed for loss-of-function studies of the DNASE1L1 gene. This heterogeneous pool of edited cells eliminates the need for single-cell cloning while delivering robust and reproducible gene disruption, making it an ideal model for investigating DNASE1L1’s roles in apoptosis, macrophage differentiation, and autoimmune disease mechanisms. The polyclonal format ensures genetic diversity and simplifies experimental scalability, suiting it for both targeted and high-throughput functional genomics applications.
The HAP1 cell line is a near-haploid human chronic myeloid leukemia (CML) cell line with adherent, fibroblast-like morphology, originally derived from the KBM-7 CML line. Its haploid genome, present in a single copy, greatly facilitates CRISPR-mediated knockout generation by obviating the need for biallelic targeting. This genetic simplicity enables researchers to rapidly assess gene function without the compensatory effects of a second allele, making HAP1 a premier model for knockout screening, signaling pathway dissection, and drug target validation. The male-origin cells maintain stable growth characteristics and are widely employed in functional genomics due to their clear phenotypic readouts.
DNASE1L1 encodes a Ca2+/Mg2+-dependent endonuclease that mediates DNA degradation during apoptosis and terminal macrophage differentiation. Its transcription is activated by TP53 and the PU.1 transcription factor, and it is further regulated by retinoic acid and interferon-gamma. Upon activation, DNASE1L1 collaborates with apoptotic executioners caspase-3, caspase-7, CAD (DFFB), endonuclease G, and AIF to drive DNA fragmentation and cell dismantling. The enzyme interacts with importin alpha and actin, linking it to cytoplasmic DNA clearance and macrophage maturation. This positions DNASE1L1 as a key effector in programmed cell death and innate immune clearance, with dysregulation contributing to autoimmune conditions such as systemic lupus erythematosus (SLE).
Disrupting DNASE1L1 in the haploid HAP1 background creates a clean loss-of-function system to dissect its contribution to apoptosis, DNA fragmentation, and macrophage biology. The polyclonal knockout approach yields high editing efficiency across the population, bypassing allele redundancy and enabling the study of DNASE1L1-dependent pathways without the confounding influence of a second functional copy. This model is particularly valuable for exploring the crosstalk between DNASE1L1 and other nucleases in DNA damage responses, as well as for examining its role in autoimmune pathogenesis where defective clearance of apoptotic material is a hallmark. The haploid context sharpens the resolution of genetic interactions and simplifies downstream phenotypic analyses.
Researchers can deploy these polyclonal knockout cells in diverse assays, including Western blotting for DNASE1L1 expression, RT-qPCR, TUNEL and Annexin V apoptosis assays, DNA fragmentation analysis, immunofluorescence, and flow cytometry-based cell death quantification. They support macrophage differentiation experiments, co-immunoprecipitation with importin alpha, and phospho-signaling analysis of apoptotic pathways. High-throughput haploid screening and RNA-seq transcriptomic profiling are readily compatible with this model to uncover global genetic dependencies. For further information or technical support, please contact Ascent Research.
