MAPK15 Knockout HAP1 Cell Line

The choice depends on the experimental question. MAPK15 (ERK7, ERK8) is a less-characterized atypical MAPK with emerging roles in autophagy regulation and ciliary biology. The Knockout line is appropriate for asking whether MAPK15 is required for predicted activities — MAPK15 is unique among MAPKs in having a long C-terminal extension and a TEY activation motif that undergoes autophosphorylation; established functions include phosphorylating LC3-related autophagy proteins and regulating ciliogenesis. Overexpression is useful for studying MAPK15 in heterologous expression contexts. For atypical MAPK research, the EDITGENE MAPK15 Knockout in HAP1 enables study of this less-characterized member of the MAPK family. Rescue with wild-type or kinase-dead MAPK15 is the standard specificity control. The knockout is valuable for studying MAPK15-dependent autophagy regulation and ciliary biology — MAPK15 has been characterized as a regulator of LC3 trafficking and primary cilium length.

Primary applications: • Autophagy regulation: LC3-II accumulation, autophagic flux, and LC3-MAPK15 interaction analysis given MAPK15's role in autophagy. • Primary cilium biology: ciliogenesis and cilium length analysis given MAPK15's role in cilium regulation. • ERK7/8 kinase activity: in vitro kinase assays using recombinant or immunoprecipitated MAPK15 with candidate substrates. • Substrate discovery: phosphoproteomics in the knockout to identify candidate MAPK15-dependent phosphorylation events. EDITGENE recommends this model for researchers investigating MAPK15 atypical kinase biology, autophagy regulation, and ciliary signaling.

Yes. MAPK15 rescue experiments require attention to unique C-terminal extension: • Construct design: use a codon-modified MAPK15 sequence with a small C-terminal tag (FLAG, HA). MAPK15 has N-terminal kinase domain with TEY activation motif and unique long C-terminal extension — preserve all elements including the C-terminal regulatory region. • Kinase-dead rescue: K42R mutation in the ATP-binding lysine abolishes catalytic activity. • Activation-loop mutant rescue: T175A/Y177F (TEY motif) mutations abolish autophosphorylation-activated kinase activity. • Functional readout: rescue should restore MAPK15-dependent autophagy regulation 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.