The AP4B1 Knockout Jurkat Polyclonal Cells constitute a CRISPR/Cas9-mediated gene-disrupted polyclonal population in the Jurkat human T lymphocyte cell line, targeting the AP4B1 locus. This loss-of-function model is established as a heterogeneous pool, enabling functional studies of the adaptor protein complex 4 (AP-4) subunit beta in a T cell background without clonal expansion artifacts.
Jurkat cells, an immortalized T lymphocyte line derived from a patient with acute T cell leukemia, serve as a well-characterized model for T cell signaling, proliferation, and apoptosis. Their extensive use in immunological research provides a relevant context for examining intracellular trafficking pathways and their roles in immune cell function.
AP4B1 encodes the beta subunit of the AP-4 complex, which mediates clathrin-associated vesicle sorting from the trans-Golgi network to endosomes and lysosomes. Together with AP4E1, AP4M1, and AP4S1, AP4B1 facilitates the trafficking of cargoes such as ATG9A and sortilin, thereby regulating lysosomal enzyme delivery, LAMP1 localization, and autophagic flux. Disruption of AP4B1 impairs these processes, linking AP-4 function to endolysosomal homeostasis and autophagy.
In Jurkat lymphocytes, AP4B1 knockout disrupts AP-4-dependent cargo sorting, leading to diminished autophagic flux and aberrant lysosomal function. This phenotype is particularly relevant for modeling AP-4 deficiency syndrome??a neurodevelopmental disorder characterized by spastic paraplegia and intellectual disability??in an immune cell context, and may reveal lymphocyte-specific roles of the AP-4 pathway in proliferation or cytokine signaling.
Applications include validation of AP4B1 disruption via Western blot and RT-qPCR, immunofluorescence localization of AP-4, and measurement of autophagy markers (LC3) by flow cytometry. Researchers can employ autophagic flux assays, lysosomal enzyme activity tests, confocal microscopy for cargo trafficking, and co-immunoprecipitation to examine interactions with ATG9A, sortilin, or other AP-4 subunits. For further information or assistance, please contact Ascent Research.
