The ITPA Knouckout A-549 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population in which the ITPA gene has been disrupted to establish a loss-of-function model. This product consists of a heterogeneous pool of A-549 cells with targeted mutations at the ITPA locus, generated via non-homologous end joining following Cas9-mediated double-strand breaks. The resulting population is ideal for investigating the consequences of ITPA ablation in human lung epithelial cells without clonal bias, enabling bulk analysis of gene disruption effects across multiple genotypes. The polyclonal format provides robust and reproducible material for functional genomics studies, particularly in drug metabolism, nucleotide homeostasis, and mitochondrial biology.
These cells are derived from the A-549 human lung adenocarcinoma cell line, which serves as a well-established model of alveolar epithelial type II (ATII) pneumocytes. A-549 cells harbor the KRAS G12S activating mutation and retain wild-type p53, closely mimicking key genetic features of non-small cell lung cancer while maintaining epithelial characteristics relevant to lung physiology. Originally isolated from a 58-year-old male patient, A-549 cells are widely used in cancer research, drug uptake and toxicity assays, and studies of pulmonary epithelial barrier function. Their adherent growth and type II pneumocyte differentiation properties make them a valuable platform for exploring lung-specific cellular responses.
ITPA encodes inosine triphosphate pyrophosphatase (ITPase), a critical enzyme in purine nucleotide metabolism that catalyzes the hydrolysis of inosine triphosphate (ITP) and deoxyinosine triphosphate (dITP) into inosine monophosphate (IMP) and pyrophosphate. By clearing these non-canonical nucleotides, ITPA prevents their aberrant incorporation into RNA and DNA, thereby preserving genomic stability and ATP pool integrity. The enzyme functions downstream of adenosine deaminase (ADA) and purine nucleoside phosphorylase (PNP) within the purine salvage pathway, and its activity is tightly linked to the maintenance of mitochondrial homeostasis. ITPA expression is regulated by the oxidative stress-responsive transcription factor NRF2, linking its function to cellular antioxidant responses. Although no canonical protein interactors are known, ITPA operates in concert with enzymes such as IMP dehydrogenase (IMPDH) and hypoxanthine-guanine phosphoribosyltransferase (HPRT) to sustain balanced nucleotide pools.
In the A-549 background, ITPA knockout holds particular significance due to the cell line’s reliance on purine metabolism for survival and proliferation under stress conditions. The KRAS G12S-driven oncogenic signaling imposes elevated demands on nucleotide synthesis and energy metabolism, potentially sensitizing these cells to nucleotide pool imbalances. Disruption of ITPA function is expected to cause accumulation of ITP and dITP, leading to mitochondrial dysfunction, reduced ATP production, and heightened susceptibility to oxidative damage. This model therefore provides a tractable system for dissecting the interplay between nucleotide salvage deficiencies and oncogenic metabolic reprogramming in lung adenocarcinoma, as well as evaluating the therapeutic potential of targeting purine metabolism in KRAS-mutant cancers.
Typical research applications of ITPA Knouckout A-549 Polyclonal Cells encompass mechanistic studies of ITPA deficiency syndrome, epileptic encephalopathy, and ribavirin-induced anemia, where ITP accumulation plays a pathogenic role. The model facilitates assessment of ribavirin toxicity by measuring clonogenic survival and mitochondrial membrane potential via flow cytometry following drug exposure. Metabolic profiling using LC-MS enables direct quantification of ITP and dITP levels, while Seahorse analysis and ATP luciferase assays reveal impacts on oxidative phosphorylation and cellular energy status. Western blotting and RT-qPCR validate ITPA absence and confirm compensatory changes in nucleotide metabolism enzymes. Moreover, this knockout tool supports investigations into oxidative stress responses and mitochondrial integrity, linking purine metabolism to broader cellular homeostasis. For additional details or assistance, please contact Ascent Research.
