CLK1 Knockout HAP1 Cell Line

The choice depends on whether you are studying CLK1 (CDC-like kinase 1)'s role as a splicing factor kinase or its functions in alternative splicing regulation. The Knockout line is the standard tool for asking whether CLK1 is required for these processes — CLK family (CLK1-4) are dual-specificity kinases that phosphorylate serine/arginine (SR) proteins (SRSF1-12) on the RS domain, regulating SR protein localization (nuclear speckle release) and splicing factor activity; CLK1 is the most-characterized CLK family member. Overexpression is useful for studying CLK1 gain-of-function effects. Important consideration: CLK family (CLK1, CLK2, CLK3, CLK4) members share substantial substrate scope — single CLK1 knockout may show modest phenotypes if other CLKs compensate. This product complements the parallel CLK4 Knockout in HAP1 (also available) for paralog-specific functional dissection. Rescue with wild-type or kinase-dead CLK1 is the standard specificity control. The knockout is a critical specificity tool for CLK inhibitors (TG003, T-025, T-039, SM08502/lociletum-emerging) in cancer (myeloid malignancies, breast cancer) and Down syndrome (DYRK1A/CLK family inhibition) drug development.

Primary applications: • SR protein phosphorylation: phospho-SRSF1, phospho-SRSF2 Western blot to characterize CLK1 kinase activity in serine speckles. • Alternative splicing regulation: RNA-seq analysis of alternative splicing in CLK1-null cells. • CLK family dissection: parallel analysis with CLK4 Knockout in HAP1 (also available) for paralog-specific characterization. • CLK inhibitor specificity: critical genetic control for TG003, T-025, T-039, SM08502 in cancer drug development. EDITGENE recommends this model for researchers investigating splicing factor kinase biology.

Yes. CLK1 rescue experiments require attention to dual-specificity kinase architecture: • Construct design: use a codon-modified CLK1 sequence with a small C-terminal tag (FLAG, HA). CLK1 has N-terminal RS domain and central kinase domain — preserve all elements. • Kinase-dead rescue: K191R mutation in the ATP-binding lysine abolishes catalytic activity. • Functional readout: rescue should restore SR protein phosphorylation patterns. 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.