The EEF2K Knockout HAP1 Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population generated in the HAP1 cell line, designed to disrupt the EEF2K gene. This product provides a robust loss-of-function model enabling functional interrogation of eukaryotic elongation factor 2 kinase (eEF2K) in a near-haploid human background. The polyclonal format offers a heterogeneous knockout population derived from a bulk editing procedure, suitable for pooled screening and population-level analyses without the limitations of single-cell cloning. Researchers benefit from a genetically defined system in which the targeted gene disruption abrogates EEF2K expression, facilitating studies of translational control and stress adaptation.
HAP1 is a near-haploid human cell line derived from the KBM-7 chronic myeloid leukemia (CML) cell line and originates from a male donor. Its near-haploid karyotype, with only one copy of most chromosomes except for a duplicated region on chromosome 15, minimizes genetic redundancy and simplifies the interpretation of knockout phenotypes. This characteristic makes HAP1 a widely adopted host for CRISPR-based functional genomics and haploid genetic screens. The cells retain key signaling pathways relevant to hematologic malignancies and stress biology, providing a physiologically pertinent context for dissecting kinase functions such as those mediated by eEF2K.
EEF2K encodes a dedicated Ca2?/calmodulin-dependent kinase that phosphorylates elongation factor 2 (eEF2) at Thr56, thereby reducing eEF2??s affinity for the ribosome and slowing peptide chain elongation. This phosphorylation event is a critical checkpoint in protein synthesis, linking translational rate to cellular energy status. Upstream, eEF2K is activated by AMPK-dependent phosphorylation during nutrient deprivation and is also positively regulated by Ca2?/calmodulin; conversely, it is inhibited by mTORC1- and cAMP/PKA-mediated phosphorylation under growth-permissive conditions. The kinase functions as a node connecting mTOR and AMPK signaling to the translational machinery. In the eEF2K knockout model, loss of this inhibitory kinase disrupts the negative regulation of eEF2, potentially leading to dysregulated translation elongation and altered cell survival during stress, which can be assessed by monitoring phospho-eEF2 levels and ribosomal activity.
Disruption of EEF2K in the HAP1 near-haploid background provides a simplified genetic landscape to investigate how eEF2K integrates anabolic and stress signals to control protein synthesis and cell fate. Because HAP1 cells originate from a CML lineage, this model is well suited to examine translational control mechanisms that contribute to leukemic cell proliferation and drug resistance. Moreover, the haploid genome facilitates genome-wide synthetic lethality screens and combinatorial CRISPR studies that probe eEF2K functional interactions. The model can be used to evaluate how loss of eEF2K affects energy homeostasis, autophagy induction, and sensitivity to chemotherapeutic agents, connecting basic translational regulation to cancer biology and potential therapeutic vulnerabilities.
Typical applications of the EEF2K Knockout HAP1 Polyclonal Cells include western blotting for phospho-eEF2 to confirm pathway disruption, polysome profiling to assess global translation changes, and proliferation assays under nutrient-restricted or drug-treated conditions. The cells are equally valuable for RT-qPCR and RNA-seq transcriptomic profiling to identify gene expression signatures downstream of eEF2K deletion, as well as for functional genomics screens combining the knockout with small molecule libraries. The polyclonal nature supports bulk enzymatic assays and drug sensitivity studies where population-level effects are of primary interest. For further details or custom inquiries, please contact Ascent Research.
