PIK3C2B Knockout HAP1 Cell Line

The choice depends on whether you are studying PIK3C2B (class II PI3K-C2β)'s role as a class II phosphoinositide 3-kinase or its specific contributions distinct from class I PI3Ks. The Knockout line is appropriate for asking whether PI3K-C2β is required for these processes — class II PI3Ks (PIK3C2A/B/G) generate PI(3)P and PI(3,4)P2, with distinct cellular localizations and functions from class I PI3Ks that generate PI(3,4,5)P3. Overexpression is useful for studying class II PI3K substrate preferences in heterologous contexts. Important consideration: PIK3C2A, PIK3C2B, and PIK3C2G are paralogous class II PI3Ks — single PIK3C2B knockout may show modest phenotypes if other class II PI3Ks compensate. Rescue with wild-type or lipase-dead PIK3C2B is the standard specificity control. The knockout is valuable for studying class II PI3K-specific functions in vesicle trafficking and cilium biology distinct from class I PI3K signaling.

Primary applications: • Class II PI3K activity: PI(3)P and PI(3,4)P2 quantification by HPLC or PIP biosensor imaging in the PIK3C2B-null background. • Vesicle trafficking: endosomal trafficking and clathrin-mediated endocytosis given class II PI3K's role in these processes. • Cilium biology: ciliogenesis and cilium-dependent signaling given class II PI3K's reported role in cilia. • Paralog analysis: PIK3C2A and PIK3C2G expression analysis to interpret PIK3C2B-specific functions. EDITGENE recommends this model for researchers investigating class II PI3K biology distinct from class I PI3Ks.

Yes. PIK3C2B rescue experiments require attention to class II PI3K architecture: • Construct design: use a codon-modified PIK3C2B sequence with a small C-terminal tag (FLAG, HA). PIK3C2B has clathrin-binding region, RBD, C2 domain, helical domain, kinase domain, and C-terminal PX-C2 domain — preserve all elements. • Kinase-dead rescue: ATP-binding lysine mutation in the catalytic domain abolishes lipase activity and serves as the standard specificity control. • Functional readout: rescue should restore PI(3)P and PI(3,4)P2 generation and downstream class II PI3K-dependent trafficking and ciliary phenotypes. 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.