The INPP5F Knockout HAP1 Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal population carrying targeted disruption of the INPP5F gene in the HAP1 host cell line. This polyclonal knockout model enables functional depletion of INPP5F at the protein level, allowing researchers to investigate loss-of-function phenotypes across a genetically heterogeneous cell pool without clonal isolation.
The HAP1 cell line is a near-haploid, adherent, fibroblast-like human cell line originally derived from a chronic myeloid leukemia patient. Its haploid karyotype makes it a valuable tool for genetic screening and functional genomics, as single-allele knockout efficiently generates complete gene disruption. The stable, robust growth characteristics of HAP1 cells facilitate reproducible experiments in signaling pathway analysis, endosomal trafficking studies, and high-content imaging.
INPP5F encodes a phosphoinositide 5-phosphatase that hydrolyzes the signaling lipids phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2) and phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3) on early endosomes. This activity critically modulates endosomal trafficking and receptor tyrosine kinase signaling, particularly that of the epidermal growth factor receptor (EGFR). INPP5F functions downstream of EGF-activated EGFR and PI3K, interacting with endosomal sorting complexes such as SNX1 and the retromer complex to promote EGFR dephosphorylation and lysosomal degradation. By attenuating local phosphatidylinositol phosphate pools, INPP5F negatively regulates AKT and mTOR signaling, and its activity supports autophagic flux. Loss of INPP5F results in sustained PI(3,4,5)P3 levels, enhanced downstream AKT phosphorylation, and impaired autophagic clearance.
In the HAP1 cell background, knockout of INPP5F provides a clean genetic model to dissect the phosphoinositide-dependent control of endosomal sorting and signal termination. Because HAP1 cells are near-haploid, the polyclonal knockout population reliably exhibits loss of INPP5F function without the compensatory effects of a second wild-type allele, enabling unambiguous interpretation of phenotypes. This system is particularly suited to studying EGFR trafficking dynamics, cross-talk between endocytosis and autophagy, and the role of phosphoinositide metabolism in cancer-relevant signaling networks.
Researchers can employ the INPP5F Knockout HAP1 Polyclonal Cells in a range of mechanistic and phenotypic assays. Typical applications include Western blot analysis of EGFR degradation and AKT phosphorylation, immunofluorescence colocalization of EGFR with endosomal markers, autophagy flux measurements using LC3 turnover, and migration or invasion assays to assess metastatic potential. The model is relevant for investigations into glioblastoma, breast cancer, Parkinson??s disease, and neurodegeneration, where aberrant EGFR signaling and defective autophagy are implicated. For further details and ordering information, please contact Ascent Research.
