STAMBP Knockout HAP1 Cell Line

The choice depends on whether you are studying STAMBP's role as an endosomal-associated K63-deubiquitinase or modeling microcephaly-capillary malformation syndrome (MIC-CAP). The Knockout line is the standard tool for both — STAMBP deubiquitinates ESCRT-pathway substrates and its loss-of-function causes MIC-CAP syndrome. Overexpression is useful for testing whether elevated STAMBP enhances K63-chain hydrolysis or for studying disease-associated catalytic variants. For STAMBP research, the EDITGENE Knockout in HAP1 provides a clean background for mechanistic dissection of K63-ubiquitin-dependent endosomal signaling. Rescue with wild-type or catalytically-dead (E292A in the JAMM motif) STAMBP is the standard specificity control. Disease-associated MIC-CAP mutations enable disease modeling.

Primary applications: • K63-deubiquitination assays: in vitro K63-chain hydrolysis using immunoprecipitated STAMBP, or ubiquitin chain analysis on endosomal substrates. • Endosomal trafficking: EGFR degradation kinetics, EGF receptor sorting to multivesicular bodies, and ESCRT pathway function analysis. • MIC-CAP disease modeling: rescue with patient-derived STAMBP mutations enables disease genotype-phenotype studies in a controlled background. • Substrate identification: K63-ubiquitin proteomics to identify substrates accumulating ubiquitin chains in the absence of STAMBP. EDITGENE recommends this model for researchers investigating K63-ubiquitin biology, ESCRT-dependent endosomal sorting, and MIC-CAP syndrome mechanisms.

Yes. STAMBP rescue experiments are well-established given the maturity of K63-DUB research: • Construct design: use a codon-modified STAMBP sequence with a small N- or C-terminal tag (FLAG, HA). The N-terminal MIT domain (microtubule interacting and trafficking) binds ESCRT components and must be preserved. • Catalytically-dead rescue: the E292A mutation in the JAMM motif abolishes K63-deubiquitinase activity and is the standard specificity control. • MIC-CAP disease mutation rescue: patient-derived STAMBP mutations enable genotype-phenotype correlation studies for microcephaly-capillary malformation syndrome. • Functional readout: rescue should restore K63-chain hydrolysis on endosomal substrates and normal EGFR sorting kinetics through the ESCRT pathway. 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.