The GTPBP1 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population in which the GTPBP1 gene is disrupted, generating a loss-of-function model. This product consists of a heterogeneous pool of HAP1 cells with targeted gene disruptions, enabling functional studies without clonal isolation. The polyclonal format provides a reproducible system for investigating GTPBP1’s roles in translation elongation, ribosome recycling, and stress granule dynamics.
The HAP1 cell line is a human near-haploid fibroblast-like line originally derived from the KBM-7 chronic myelogenous leukemia (CML) line. Its near-haploid karyotype, with a single copy of most chromosomes, simplifies genetic manipulation and phenotypic analysis, as gene disruptions often yield unambiguous loss-of-function phenotypes. HAP1 cells are widely employed in CRISPR-based functional genomics screens and detailed mechanistic studies, offering a physiologically relevant model for human disease research.
GTPBP1 encodes a conserved translational GTPase that facilitates ribosome recycling during both elongation and termination phases of protein synthesis. The protein operates downstream of mTORC1 signaling and is activated by cellular stresses such as oxidative stress and heat shock. GTPBP1 directly interacts with ABCE1 and the eukaryotic peptide release factor eRF3 (also known as GSPT1) to drive ribosome dissociation. Additionally, it associates with poly(A)-binding protein PABPC1 and localizes to stress granules by interacting with core markers G3BP1 and TIA1. Through these interactions, GTPBP1 modulates stress granule assembly and disassembly, thereby coordinating translational repression with stress adaptation and autophagy pathways.
In the near-haploid HAP1 background, disruption of GTPBP1 eliminates functional redundancy, making it an ideal system to dissect the protein’s role in translation control and stress responses. Researchers can utilize this polyclonal population to probe how loss of GTPBP1 affects ribosome recycling kinetics, translation fidelity, and the dynamics of stress granule formation and clearance. Such studies are directly relevant to understanding translational dysregulation in cancer, where tumor cells rely on stress adaptation, and in neurodevelopmental disorders like microcephaly, which have been linked to defects in ribosome function and protein synthesis.
The GTPBP1 Knockout HAP1 Polyclonal Cells are suitable for a broad spectrum of experimental approaches. Applications include dissecting translation regulation mechanisms, characterizing stress granule biology, modeling cancer-related translational control, and investigating neurodevelopmental pathologies. Compatible assays encompass Western blotting for protein expression analysis, puromycin incorporation to measure global translation rates, immunofluorescence microscopy to visualize stress granule markers (G3BP1, TIA1), polysome profiling and ribosome profiling for translation status, co-immunoprecipitation to confirm protein interactions (e.g., with ABCE1 and eRF3), and flow cytometry for quantification of translation activity. For detailed technical support and ordering, please contact Ascent Research.
