The ASF1A Knockout A-549 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population generated from the A-549 human lung adenocarcinoma cell line. This product provides a loss-of-function model for ASF1A, a critical histone chaperone. The polyclonal format provides a heterogeneous allele pool, a common approach for population-based functional studies, enabling robust gene function assessment without clonal bias. Researchers can use this knockout pool to probe ASF1A-dependent processes in lung cancer biology.
A-549 cells, derived from a human lung adenocarcinoma, are a widely used model for non-small cell lung cancer (NSCLC). These adherent epithelial cells retain features of lung adenocarcinoma, including KRAS and STK11 mutations, and are employed in tumor cell biology, drug response, and metastasis studies. Their robust growth and signaling networks make them ideal for genetic perturbation. The lung epithelial origin provides a physiologically relevant context for investigating ASF1A??s role in DNA replication and chromatin dynamics.
ASF1A is a dedicated histone chaperone for H3/H4 dimers, shuttling newly synthesized histones to downstream assembly factors. It is regulated by E2F1-mediated transcription and phosphorylation by CDK2/cyclin E and TLK1/2. ASF1A interacts directly with histones H3/H4 and transfers them to the CAF-1 complex (CHAF1A, CHAF1B, RBBP4) for replication-coupled deposition or to the HIRA complex (HIRA, UBN1, CABIN1) for replication-independent assembly. Through these interactions, ASF1A coordinates DNA replication via MCM2-7 helicase and PCNA, and influences p53 signaling. Its chaperone activity is essential for nucleosome assembly and cell cycle gene expression.
In A-549 cells, ASF1A disruption impairs histone H3/H4 delivery to nascent DNA, causing chromatin assembly defects and replication stress. This triggers DNA damage responses and cell cycle arrest, particularly relevant in cancer cells with dysregulated proliferation. As A-549 cells have wild-type p53, they are valuable for studying ASF1A loss effects on p53 checkpoints and DNA repair. This knockout thus reveals epigenetic vulnerabilities in lung adenocarcinoma and potential synthetic lethal interactions.
These polyclonal knockout cells serve as a versatile tool for chromatin biology and oncology research. They enable histone dynamics analysis via ChIP and western blotting for H3/H4 modifications. Flow cytometry quantifies cell cycle effects, while immunofluorescence visualizes DNA damage foci after genotoxic stress. Proliferation and colony assays assess tumor growth impacts, and RNA-seq can uncover ASF1A-mediated transcriptional programs. Co-immunoprecipitation maps altered interactions with HIRA and CAF-1 complexes. For further information and ordering, please contact Ascent Research.
