USP46 Knockout HAP1 Cell Line

The choice depends on the experimental question. The Knockout line is appropriate for asking whether USP46 is required for its reported functions in PHLPP regulation, GluA1/GluA2 deubiquitination, or behavioral phenotypes. Overexpression is useful for testing whether elevated USP46 is sufficient to alter substrate ubiquitination levels. For USP46 research, the EDITGENE Knockout line in HAP1 is the more rigorous starting tool because USP46 functions in complexes with WDR48/WDR20, and complete loss in a near-haploid background reveals substrate dependencies more clearly than partial reduction in diploid lines. Rescue with wild-type or catalytically-dead USP46 (active site cysteine mutation) is the standard specificity control.

Primary applications: • Substrate stability: cycloheximide chase analysis for reported USP46 substrates including PHLPP and AMPA receptor subunits (GluA1, GluA2). • Complex composition studies: co-immunoprecipitation analysis of USP46-WDR48-WDR20 ternary complex assembly and substrate engagement. • Behavioral relevance assays: where neuronal context is relevant, ubiquitination state analysis of glutamate receptor subunits. • Akt/PHLPP pathway: phospho-Akt, phospho-S6K analysis to assess USP46's role in PHLPP-mediated Akt regulation. EDITGENE recommends this model for researchers investigating USP46 deubiquitinase biology, PHLPP/Akt signaling, and AMPA receptor regulation.

Yes. USP46 rescue experiments require attention to complex partner requirements: • Construct design: use a codon-modified USP46 sequence with a C-terminal tag (FLAG, HA). USP46 is small (~366 amino acids) and tolerates either N- or C-terminal tagging. • Catalytically-dead rescue: an active site cysteine mutation (typically C44A) serves as the deubiquitinase specificity control. • WDR48/WDR20 partner considerations: USP46 functions as part of a ternary complex with WDR48 and WDR20. Rescue interpretation should account for WDR partner availability — overexpressed USP46 without partners may show reduced activity. • Functional readout: rescue should restore deubiquitination of substrates including PHLPP and AMPA receptor subunits, as measured by cycloheximide chase and ubiquitination Western blots. 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.