POLN Knockout HAP1 Cell Line

The choice depends on whether you are studying POLN (DNA polymerase ν)'s role as a translesion DNA synthesis polymerase or its emerging functions in interstrand crosslink (ICL) repair. The Knockout line is appropriate for asking whether DNA polymerase ν is required for these processes — POLN is a low-fidelity A-family polymerase implicated in homologous recombination, ICL repair, and translesion synthesis past specific DNA adducts. Overexpression is useful for studying POLN in DNA damage tolerance contexts. For DNA repair research, the EDITGENE POLN Knockout in HAP1 enables study of this less-characterized translesion synthesis polymerase. Other translesion synthesis polymerases (POLH, POLK, POLI, REV1) expression analysis aids interpretation given functional redundancy. Rescue with wild-type or catalytically-dead POLN is the standard specificity control. The knockout is valuable for ICL agent (mitomycin C, cisplatin) sensitivity studies.

Primary applications: • ICL repair: mitomycin C, cisplatin, and psoralen + UVA sensitivity assays to assess POLN's contribution to interstrand crosslink repair. • Homologous recombination: HR reporter assays and RAD51 foci analysis following DNA damage induction. • Translesion synthesis: replication past defined DNA adducts in cellular and in vitro assays. • TLS polymerase paralog studies: POLH, POLK, POLI, REV1 expression analysis to interpret POLN-specific functions. EDITGENE recommends this model for researchers investigating translesion DNA synthesis, ICL repair, and chemotherapy resistance mechanisms.

Yes. POLN rescue experiments require attention to polymerase architecture: • Construct design: use a codon-modified POLN sequence with a small C-terminal tag (FLAG, HA). POLN is a large A-family polymerase — preserve full domain organization. • Catalytically-dead rescue: active site mutations (typically conserved aspartate residues coordinating divalent metal ions) abolish polymerase activity and serve as the standard specificity control. • Functional readout: rescue should restore TLS past specific lesions and ICL agent sensitivity. 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.