LTK Knockout HAP1 Cell Line

The choice depends on whether you are studying LTK (leukocyte tyrosine kinase)'s role as a receptor tyrosine kinase or modeling its emerging role as an oncogenic fusion partner in NSCLC. The Knockout line is the standard tool for asking whether LTK is required for these processes — LTK is closely related to ALK (anaplastic lymphoma kinase), forming the LTK/ALK subfamily of insulin receptor superfamily RTKs. LTK is activated by FAM150A/B (ALKAL) ligands. Overexpression is useful for studying LTK in heterologous expression contexts. For lung cancer research, the EDITGENE LTK Knockout in HAP1 enables study of LTK biology. LTK fusion oncogenes (e.g., CLIP1-LTK) have been characterized in a small subset of NSCLC, making LTK an emerging cancer target — early evidence suggests LTK fusions may respond to ALK inhibitors (lorlatinib). Rescue with wild-type or kinase-dead LTK is the standard specificity control. The knockout is valuable for studying ALK inhibitor cross-reactivity with LTK and emerging LTK-targeted therapeutic strategies.

Primary applications: • ALKAL ligand-induced signaling: phospho-LTK and downstream MAPK/PI3K pathway activation following FAM150A/B (ALKAL1/2) stimulation. • LTK fusion oncogene studies: in heterologous expression contexts, characterization of CLIP1-LTK or other LTK fusion oncogene activities. • ALK inhibitor cross-reactivity: lorlatinib, alectinib, and other ALK inhibitor specificity testing for LTK activity. • LTK-targeted NSCLC therapeutic strategies: emerging precision oncology approaches for LTK-fusion NSCLC patients. EDITGENE recommends this model for researchers investigating LTK biology, LTK-fusion NSCLC mechanisms, and ALK-family inhibitor cross-reactivity.

Yes. LTK rescue experiments require attention to RTK architecture: • Construct design: use a codon-modified LTK sequence with a small intracellular C-terminal tag (FLAG, HA). LTK has extracellular ligand-binding domain, single transmembrane span, juxtamembrane region, and intracellular kinase domain — preserve all elements. • Surface localization validation: confirm plasma membrane localization by cell surface staining before functional assays. • Kinase-dead rescue: ATP-binding lysine mutation abolishes catalytic activity. • Fusion oncogene rescue: chimeric LTK fusion constructs (e.g., CLIP1-LTK) enable studies of fusion-driven oncogenic activation. • Functional readout: rescue should restore ALKAL-induced phospho-LTK and downstream MAPK/PI3K activation. HAP1-specific considerations: • Diploidization: HAP1 cells gradually diploidize during extended culture — confirm ploidy by flow cytometry at the time of phenotypic assay. • Integration site sensitivity: position effects on transgene expression are more pronounced in near-haploid backgrounds; generating multiple independent rescue clones is strongly recommended. • Transduction efficiency: HAP1 transduces with lentivirus at moderate efficiency — increase MOI compared to standard immortalized lines.