ACO1 Knockout HeLa Polyclonal Cells comprise a CRISPR/Cas9-edited human cell population with targeted disruption of the ACO1 gene, generated on the HeLa cervical adenocarcinoma background. This polyclonal knockout product provides a heterogeneous pool of edited cells, each carrying genetic modifications within the ACO1 locus, enabling robust loss-of-function studies without clonal selection bias. The ACO1 gene encodes a bifunctional protein that serves as cytoplasmic aconitase in the tricarboxylic acid cycle and as iron regulatory protein 1 (IRP1) under iron-depleted conditions, making this model system valuable for dissecting iron homeostasis and metabolic regulation.
The parental HeLa cell line is an immortalized cervical adenocarcinoma epithelial cell line positive for human papillomavirus 18 (HPV-18), widely employed in biomedical research due to its robust adherent growth and well-characterized signaling networks. HeLa cells provide a relevant cancer cell context for studying the interplay between oncogenic transformation and metabolic pathways, including iron-dependent processes.
ACO1 functions as a central regulator of cellular iron metabolism. In iron-replete conditions, the protein assembles an iron-sulfur cluster and acts as a cytoplasmic aconitase, catalyzing the isomerization of citrate to isocitrate within the TCA cycle. Upon iron depletion, loss of the iron-sulfur cluster triggers a conformational switch, enabling IRP1 to bind iron-responsive elements (IREs) in the untranslated regions of target mRNAs. This post-transcriptional control represses translation of ferritin and ferroportin while stabilizing the transferrin receptor mRNA, thereby modulating iron uptake, storage, and export. ACO1 activity is influenced by intracellular iron levels, reactive oxygen species, nitric oxide, and PKC-mediated phosphorylation. It interacts with IRE-containing transcripts, iron-sulfur cluster assembly factors ISCU and NFS1, and the paralogous regulator IRP2.
In HeLa cells, ACO1 contributes to the metabolic flexibility and redox balance often dysregulated in cancer. Disruption of ACO1 in this HPV-18-positive cervical adenocarcinoma line permits detailed investigation of how iron-sensing mechanisms intersect with oncogenic signaling and metabolic reprogramming. The model is particularly suited for studying iron-dependent cell survival, oxidative stress responses, and adaptations to iron deficiency or overload??conditions that influence tumor progression and neurodegenerative pathology. Because HeLa cells lack p53 and exhibit altered cell cycle control, the knockout background may also reveal context-specific roles of IRP1 in growth and apoptosis.
Researchers can employ this polyclonal ACO1 knockout model in a variety of experimental paradigms. Typical applications include mechanistic studies of iron homeostasis using western blotting for ACO1/IRP1 expression, electrophoretic mobility shift assays (EMSA) to assess IRE-binding activity, and RT-qPCR profiling of iron-regulated mRNAs. Cellular iron uptake and aconitase enzymatic assays enable functional readouts of iron-sulfur cluster status, while flow cytometry for transferrin receptor levels and immunofluorescence tracking of IRP1 localization provide complementary phenotypic analyses. The model further supports screening campaigns to identify small-molecule modulators of IRP1 activity and investigations into iron-dependent cancer cell adaptation. For further technical details or to discuss custom requirements, please contact Ascent Research.
