RAB8A Knockout HAP1 Cell Line

The choice depends on whether you are studying RAB8A's role in primary cilia formation, polarized membrane trafficking, or insulin-stimulated GLUT4 translocation. The Knockout line is the standard tool for asking whether RAB8A is required for these processes — RAB8A is essential for primary ciliogenesis (delivering vesicles to the ciliary base) and is one of the principal RABs regulating GLUT4 storage vesicle trafficking. Overexpression is useful for studying RAB8A in heterologous expression systems or for testing constitutively active (Q67L) versus dominant negative (T22N) RAB8A. For ciliogenesis and membrane trafficking research, the EDITGENE RAB8A Knockout in HAP1 is a clean genetic background for mechanistic studies. RAB8B paralog expression should be assessed given functional overlap in cilia biology. Rescue with wild-type, constitutively active, or dominant negative RAB8A enables comprehensive GTPase cycle dissection.

Primary applications: • Primary cilia formation: serum starvation-induced ciliogenesis assays (Arl13b, acetylated tubulin immunofluorescence) to assess RAB8A's contribution to cilium assembly. • Polarized membrane trafficking: post-Golgi vesicle delivery to the plasma membrane and apical sorting in polarized cell contexts. • GLUT4 trafficking: insulin-stimulated GLUT4 vesicle translocation studies in heterologous expression contexts. • RAB8 paralog studies: RAB8B expression analysis to interpret RAB8A-specific phenotypes given paralog overlap. EDITGENE recommends this model for researchers investigating ciliogenesis, polarized trafficking, and RAB family biology.

Yes. RAB8A rescue experiments require attention to GTPase cycle and prenylation: • Construct design: use a codon-modified RAB8A sequence with a small N-terminal tag (FLAG, HA, GFP for imaging). RAB8A has C-terminal CAAX-like motif for geranylgeranylation — preserve and do not tag C-terminus. • GTPase cycle mutant rescue: Q67L (constitutively active, GTP-locked) and T22N (dominant negative, GDP-locked) mutants enable cycle-specific function dissection. • Prenylation-deficient rescue: cysteine-to-serine mutation in the C-terminal CAAX motif abolishes geranylgeranylation and membrane association. • Functional readout: rescue should restore primary ciliogenesis (cilium length and frequency) and polarized membrane trafficking. 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.