DNASE1L1 Knockout HeLa Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HeLa human cervical adenocarcinoma line. This product features targeted disruption of the DNASE1L1 gene, which encodes a DNA endonuclease responsible for chromatin cleavage during programmed cell death. The polyclonal format ensures a heterogeneous pool of edited alleles, providing a robust loss-of-function model without clonal selection artifacts. By abolishing DNASE1L1 expression, the cell population enables researchers to dissect the gene??s precise role in apoptotic DNA fragmentation, independent of other nucleases.
The host HeLa cell line is an immortalized epithelial model originally isolated from a cervical adenocarcinoma and is characterized by stable integration of human papillomavirus type 18 (HPV18) sequences. HeLa cells are widely employed in cancer biology, apoptosis, and drug response studies due to their rapid proliferation, genetic tractability, and well-characterized signaling networks. The retention of key apoptotic machinery makes HeLa an appropriate platform for investigating cell death mechanisms, although HPV oncoprotein expression partially attenuates the p53 and retinoblastoma pathways, which can influence the apoptotic threshold.
DNASE1L1 operates within the intrinsic and extrinsic apoptotic cascades, functioning downstream of caspase activation. Caspase-9, activated by the apoptosome complex comprising cytochrome c and APAF-1, processes caspase-3, which in turn cleaves the inhibitor of caspase-activated DNase (ICAD), releasing CAD to mediate DNA cleavage. DNASE1L1 is thought to contribute additional endonuclease activity, targeting genomic DNA and chromatin alongside CAD. The enzyme interacts with cytoskeletal components beta-actin and gamma-actin, which may localize it to specific subcellular regions during apoptosis. Upstream regulators include broad apoptotic signals and caspase cascades, while downstream targets are primarily genomic DNA and chromatin.
In the context of HeLa cells, disruption of DNASE1L1 offers a unique tool to study the non-redundant functions of endonucleases in apoptosis. Although HeLa cells undergo apoptosis in response to various stimuli, the integration of HPV18 oncogenes can modulate the expression of BCL2 family members and caspase regulators, thereby altering the cell death program. The knockout model can reveal whether DNASE1L1 contributes to DNA fragmentation in the presence of HPV-induced anti-apoptotic pressures, potentially highlighting its role in cancer cell susceptibility to chemotherapeutics or DNA-damaging agents.
This polyclonal knockout cell population is suited for a range of apoptosis-related investigations, including the assessment of DNA fragmentation via TUNEL or comet assays, monitoring nuclear morphology by immunofluorescence, and quantifying apoptotic markers such as cleaved caspase-3 by western blotting. It can be applied to drug sensitivity studies to determine whether DNASE1L1 deficiency alters the response to chemotherapies that induce DNA damage. Additional applications include flow cytometric analysis of phosphatidylserine externalization using Annexin V/PI staining and RT-qPCR to confirm gene disruption. For further technical specifications and ordering information, please contact Ascent Research.
