ACVR1B Knockout HAP1 Cell Line

The choice depends on whether you are studying ACVR1B (ALK4, activin receptor type 1B)'s role as the principal type I activin receptor or modeling activin/SMAD2/3 signaling. The Knockout line is the standard tool for asking whether ALK4 is required for these processes — ACVR1B/ALK4 is a type I serine/threonine kinase receptor that, upon activin binding to type II receptors (ACVR2A/ACVR2B), is recruited and phosphorylated, then phosphorylates SMAD2/3 to transduce activin and some GDF signals; ALK4 is the principal type I receptor for activin signaling. Overexpression is useful for studying ACVR1B gain-of-function effects. For activin signaling research, the EDITGENE ACVR1B Knockout in HAP1 enables study of ALK4-specific functions. This product complements the parallel ACVR1B & TGFBR1 Double Knockout in HEK293 (also available) for systematic type I receptor dissection. Rescue with wild-type, kinase-dead, or constitutively active (T206D) ACVR1B enables structure-function studies. The knockout is valuable for studying activin-SMAD2/3 signaling and as a specificity tool for ALK4/5 inhibitors (SB-431542, galunisertib affect both ALK4 and ALK5). 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.

Primary applications: • Activin-SMAD2/3 signaling: activin-induced phospho-SMAD2/3 analysis in ALK4-null cells. • Type I receptor dissection: parallel analysis with the ACVR1B & TGFBR1 Double KO in HEK293 (also available) for activin vs TGF-β type I receptor dissection. • ALK4/5 inhibitor specificity: critical genetic control for SB-431542, galunisertib (which affect both ALK4 and ALK5). • Activin biology: in heterologous developmental/reproductive contexts, activin-mediated SMAD signaling. EDITGENE recommends this model for researchers investigating activin type I receptor biology and SMAD2/3 signaling.

Yes. ACVR1B/ALK4 rescue experiments are well-established for activin receptor research: • Construct design: use a codon-modified ACVR1B sequence with a small intracellular C-terminal tag (FLAG, HA). ALK4 has extracellular ligand-binding domain, transmembrane span, GS domain, and intracellular kinase domain — preserve all elements. • Surface localization validation: confirm plasma membrane localization before functional assays. • Kinase-dead rescue: K234R mutation in the ATP-binding lysine abolishes catalytic activity. • Constitutively active rescue: T206D mutation in the GS domain generates constitutively active ALK4. • Functional readout: rescue should restore activin-induced phospho-SMAD2/3 signaling. 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.