PPP1R18 Knockout HAP1 Cell Line

The choice depends on whether you are studying PPP1R18 (phostensin)'s role as an F-actin-binding PP1 regulatory subunit or its functions in actin cytoskeleton regulation. The Knockout line is appropriate for asking whether PPP1R18 is required for PP1 targeting to F-actin and actin-binding proteins — PPP1R18 directly binds F-actin and recruits PP1 to actin filaments, with reported functions in actin cytoskeleton stability and cell motility. Overexpression is useful for studying PP1-actin interactions in heterologous contexts. For actin cytoskeleton research, the EDITGENE PPP1R18 Knockout in HAP1 enables study of PP1-mediated actin regulation. Rescue with wild-type or F-actin-binding-deficient PPP1R18 enables structure-function studies. The knockout is valuable for characterizing PP1-actin targeting biology distinct from PP1-myosin targeting (mediated by MYPT family).

Primary applications: • F-actin binding: in vitro and cellular F-actin co-sedimentation and imaging analysis to characterize phostensin-actin interactions. • Actin cytoskeleton biology: actin dynamics imaging, cell morphology, and motility assays in PPP1R18-null cells. • PP1-actin substrate dephosphorylation: phosphoproteomic identification of PPP1R18-dependent actin-associated substrate dephosphorylation. • Cell motility studies: migration and invasion assays given PPP1R18's reported role in cytoskeletal regulation. EDITGENE recommends this model for researchers investigating PP1-mediated actin cytoskeleton regulation.

Yes. PPP1R18 rescue experiments require attention to actin-binding biology: • Construct design: use a codon-modified PPP1R18 sequence with a small C-terminal tag (FLAG, HA). PPP1R18 contains F-actin binding regions and PP1-binding RVxF motif — preserve both elements. • F-actin-binding-deficient rescue: mutations in the actin-binding region disrupt F-actin association without affecting PP1 binding. • PP1-binding-deficient rescue: RVxF mutations enable separating PP1-dependent from PP1-independent phostensin functions. • Functional readout: rescue should restore F-actin co-localization (imaging) and PP1-actin targeted substrate dephosphorylation. 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.