ITPR1 and ITPR2 and ITPR3 Knockout HEK293 Cell Line

The choice depends on whether you are studying combined IP3 receptor function for ER Ca²⁺ release or distinguishing IP3R-mediated calcium signaling from IP3R-independent processes. The Triple Knockout line is uniquely valuable for asking whether IP3R-mediated calcium release is required for these processes — ITPR1, ITPR2, and ITPR3 are three functionally redundant IP3-gated Ca²⁺ release channels on the endoplasmic reticulum membrane. Single or double knockouts retain residual IP3R activity from the remaining paralog(s); triple knockout completely eliminates IP3R-mediated ER Ca²⁺ release. Single-isoform rescue (ITPR1, ITPR2, or ITPR3 alone) in the triple knockout enables isoform-specific functional dissection — the gold-standard experimental design for ITPR family. For calcium signaling research, the EDITGENE ITPR1/2/3 Triple Knockout in HEK293 is the gold-standard genetic tool — combined loss is required to eliminate IP3R-mediated Ca²⁺ release given the substantial functional overlap among the three isoforms. Single-isoform rescue is the gold-standard experimental design for distinguishing isoform-specific functions. The triple knockout is a critical specificity control for IP3R modulators (xestospongins, 2-APB) and is invaluable for studying Ca²⁺ store-dependent processes (mitochondrial Ca²⁺ uptake, ER-mitochondria contact sites, autophagy regulation) in a clean IP3R-null background.

Primary applications: • Complete IP3R elimination: Ca²⁺ imaging following IP3-generating stimuli (Gq-coupled GPCR agonists, IP3 photorelease) — triple KO completely eliminates IP3-induced Ca²⁺ release, distinct from any single or double KO. • Single-isoform rescue: re-introduction of ITPR1, ITPR2, or ITPR3 alone in the triple knockout enables isoform-specific functional dissection — the gold-standard experimental design for IP3R family. • ER-mitochondria Ca²⁺ transfer: mitochondrial Ca²⁺ uptake (mitoYC3.6, GCaMP6-Mito) following ER Ca²⁺ release in the IP3R-null context. • Store-dependent process studies: autophagy regulation, mitochondrial bioenergetics, and ER-mitochondria contact site studies in the complete IP3R-null background. EDITGENE recommends this triple knockout as the gold-standard genetic tool for IP3R-mediated calcium signaling research and as a clean background for isoform-specific structure-function studies.

Yes, and rescue experiments are uniquely powerful in this triple knockout: • Single-isoform rescue: re-introduction of ITPR1, ITPR2, or ITPR3 alone in the triple knockout enables isoform-specific functional dissection — the gold-standard experimental design for redundant IP3R family members. • Construct design: each ITPR isoform encodes a very large protein (~2700-3000 aa) — full-length cDNA rescue (~9 kb) is technically demanding. Use codon-modified sequences with small C-terminal tags (FLAG, HA); preserve IP3-binding region, central regulatory domain, and C-terminal channel domain with six transmembrane spans. • Channel-dead rescue: pore-loop residue mutations abolish Ca²⁺ permeation and serve as the standard specificity control for any single isoform rescue. • IP3-binding-deficient rescue: N-terminal IP3-binding domain mutations enable separation of IP3-induced versus constitutive Ca²⁺ release. • Functional readout: rescue should restore IP3-induced ER Ca²⁺ release measured by Ca²⁺ imaging (Fura-2, GCaMP6) following Gq-coupled GPCR stimulation or IP3 photorelease. HEK293 transduces efficiently with lentivirus and supports systematic isoform-specific rescue experiments.