The AK4 Knockout HAP1 Polyclonal Cells product provides a polyclonal population of HAP1 cells bearing a CRISPR/Cas9-mediated disruption of the AK4 gene. This knockout model serves as a loss-of-function tool for investigating the biological roles of adenylate kinase 4 (AK4) in cellular energy homeostasis and nucleotide metabolism. The polyclonal format reflects a heterogeneous pool of edited cells, enabling robust functional studies without the need for single-cell cloning. Researchers can use this model to interrogate AK4-dependent signaling networks and metabolic pathways in a near-haploid human cell background, facilitating high-throughput screening and detailed mechanistic analyses.
The host HAP1 cell line is a human near-haploid fibroblast-like line originally derived from the KBM-7 chronic myeloid leukemia cells. Its adherent growth characteristics and near-haploid karyotype make it particularly suitable for functional genomics, CRISPR screens, and studies requiring unambiguous genotype-phenotype correlations. HAP1 cells retain key signaling and metabolic pathways found in somatic human cells, yet their simplified genomic landscape reduces the complexity of gene-editing experiments. This background provides a reproducible platform for dissecting the consequences of AK4 knockout on mitochondrial function and energy stress responses.
AK4 encodes a mitochondrial adenylate kinase that catalyzes the phosphotransfer between GTP and AMP, thereby serving as a critical regulator of the AMP/ATP ratio and AMPK signaling. AK4 is transcriptionally regulated by upstream factors such as TP53 and HIF1A, and its expression is induced by hypoxia and oxidative stress. Functionally, AK4 interacts with adenine nucleotide translocator (ANT) and voltage-dependent anion channel (VDAC) at the mitochondrial inner membrane, modulating mitochondrial adenine nucleotide transport and influencing the opening of the mitochondrial permeability transition pore (mPTP). Downstream, AK4-dependent control of AMPK phosphorylation impacts broader energy homeostasis and nucleotide metabolism pathways, with key pathway components including ATP, AMP, ADP, and cytochrome c.
In the HAP1 cell context, the AK4 polyclonal knockout population offers a powerful system to study mitochondrial dysfunction and apoptosis regulation. The near-haploid nature of HAP1 cells facilitates the examination of gene dosage effects, while the polyclonal composition allows for the assessment of population-level responses to energetic insults. Disruption of AK4 is expected to alter AMPK activation kinetics and mPTP dynamics, providing a model to explore how adenine nucleotide flux controls cell fate decisions under metabolic stress. This system is particularly relevant for cancer biology, given the central role of AK4 in energy adaptation and apoptosis resistance.
This knockout model supports a wide array of experimental applications, including cancer metabolism research, drug resistance studies, and neurodegenerative disease modeling. Representative assays include western blotting for AMPK phosphorylation status, quantification of ATP/ADP/AMP ratios, mitochondrial membrane potential measurements using JC-1 or TMRM dyes, and apoptosis assessments via TUNEL staining or caspase activity assays. Co-immunoprecipitation and immunofluorescence experiments can further elucidate AK4 interactions with ANT and VDAC. For additional information or to discuss custom experimental requirements, please contact Ascent Research.
