The ARL8A Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population generated for loss-of-function analysis of the lysosomal small GTPase ARL8A. This polyclonal model provides a heterogeneous cell pool with disrupted ARL8A expression, enabling functional studies without clonal selection bias. The CRISPR/Cas9-mediated gene disruption targets the ARL8A locus, delivering a versatile system for investigating ARL8A-dependent cellular processes.
HEK293T cells are human embryonic kidney epithelial cells that stably express the SV40 large T antigen, conferring exceptional transfection efficiency and protein production capacity. Derived from the HEK293 lineage, this adherent cell line is a standard host for viral packaging, transient expression, and biochemical assays. The epithelial background provides a well-characterized platform to examine intracellular trafficking, including lysosome dynamics and autophagy flux.
ARL8A functions as a lysosome-resident small GTPase that cycles between GDP- and GTP-bound states to control lysosomal positioning and trafficking. In its active GTP-bound form, ARL8A recruits the adaptor SKIP (PLEKHM2), which couples lysosomes to the microtubule motor kinesin-1 (KIF5B) via kinesin light chain 1 (KLC1), driving anterograde transport toward the cell periphery. ARL8A also interacts with the HOPS complex subunits VPS18 and VPS39 to facilitate autophagosome?Clysosome fusion. This trafficking function is essential for mTORC1 signaling, as peripheral lysosome positioning is required for nutrient-dependent mTORC1 activation. ARL8A is regulated by GTP binding and the BORC complex, integrating upstream signals from Rab7 to coordinate lysosomal motility with cellular metabolism.
In HEK293T cells, ARL8A disruption leads to defective lysosomal anterograde transport, resulting in perinuclear accumulation of lysosomes, a phenotype easily scored by immunofluorescence. This mislocalization impairs autophagosome?Clysosome fusion and attenuates mTORC1 activity, providing a direct cell model to link lysosome positioning with autophagy and nutrient sensing. The polyclonal nature of the knockout pool preserves the genetic heterogeneity of the parental line, allowing robust assessment of ARL8A??s role in cellular processes such as cell migration, where lysosome positioning influences focal adhesion dynamics.
Applications include immunofluorescence staining for lysosomal markers, live-cell imaging of lysosome motility, and western blot analysis of autophagy substrates LC3-II and p62. Co-immunoprecipitation experiments can validate ARL8A??s interaction with SKIP, and GTPase activity assays directly measure ARL8A activation. Lysosomal pH monitoring with LysoTracker or cell migration/invasion assays extend the utility to drug screening and motility studies. This polyclonal knockout cell population is well-suited for chemical modifier screens and for dissecting lysosome-dependent signaling pathways. For further details, please contact Ascent Research.
