APEH Knockout HAP1 Polyclonal Cells are a genetically disrupted polyclonal cell population generated through CRISPR/Cas9-mediated targeting of the human APEH gene in the near-haploid HAP1 cell line. This product provides a loss-of-function model for investigating the biological functions of the APEH enzyme, which possesses dual acylaminoacyl peptidase and exopeptidase activities. The polyclonal knockout population preserves the heterogeneous nature of the edited pool, avoiding clonal artifacts while uniformly eliminating APEH expression. It serves as a versatile tool for functional genomics in a chronic myeloid leukemia-derived background.
The HAP1 cell line is derived from the male chronic myeloid leukemia cell line KBM-7 and is characterized by a near-haploid karyotype. This near-haploid nature simplifies genetic manipulation, as targeting a single allele is sufficient to achieve functional knockout, making HAP1 cells particularly advantageous for genome-wide screening and knockout validation studies. The host cells retain oncogenic features of CML, providing a model for studying signaling pathways dysregulated in leukemia and other cancers. The polyclonal format maintains the original genetic diversity of the parental line while ensuring robust APEH disruption across the population.
APEH encodes an evolutionarily conserved bifunctional enzyme that removes N-acylated amino acids from peptides, playing an essential role in the terminal stages of protein degradation and the processing of acetylated proteins. Mechanistically, APEH functions downstream of oxidative stress and cellular stress signals, acting in concert with the ubiquitin-proteasome system. It directly interacts with proteasome subunits and molecular chaperones, facilitating the hydrolysis of acetylated peptides. Key downstream targets include the inactivation of acetylated signaling molecules such as MCP-1 and alpha-MSH, linking APEH to inflammatory regulation. Disruption of APEH leads to accumulation of these and other acetylated peptides, perturbing normal protein turnover and signaling dynamics.
In the context of the HAP1 near-haploid background, APEH knockout provides a clean genetic system to dissect the enzyme??s contributions to oxidative stress resilience and acetylated peptide homeostasis without interference from a second functional allele. This polyclonal knockout population is particularly suited for pooled screening approaches, such as examining the impact of APEH loss on proteasome inhibition or oxidative damage sensitivity. The model enables researchers to study the interplay between protein acetylation, degradation, and stress signaling pathways that are often dysregulated in inflammatory diseases, metabolic disorders, and cancer. Owing to the homogeneous genetic disruption of APEH, reproducible phenotypes can be observed while retaining the advantages of a heterogeneous cell pool.
This knockout model supports applications including western blotting for APEH protein, enzymatic activity assays using acetylated substrates, mass spectrometric quantification of acetylated peptides, and ELISA-based measurement of MCP-1 levels. Researchers can also assess cell viability under oxidative stress to evaluate APEH’s role in protection against proteotoxic insults. The system supports studies of molecular mechanisms underlying inflammatory signaling, protein turnover, and metabolic regulation. For further details, contact Ascent Research.
