KCNK3 Knockout HAP1 Polyclonal Cells provide a CRISPR/Cas9-edited polyclonal knockout cell population engineered for precise loss-of-function studies of the human KCNK3 gene. This product is generated by CRISPR/Cas9-mediated gene disruption in the HAP1 host cell line, yielding a mixed pool of edited cells with targeted interruption of the KCNK3 locus. The polyclonal format offers a robust, population-level model for functional genomics, eliminating subclone bias while retaining the high editing efficiency characteristic of the HAP1 system. Researchers can rely on these knockout cells for reproducible interrogation of TASK-1 potassium channel biology across multiple experimental paradigms.
HAP1 is a near-haploid, chronic myeloid leukemia-derived cell line originating from KBM-7 CML cells. Its male karyotype is near-haploid across all chromosomes except for a disomy of chromosome 15, resulting in a simplified genetic background that is highly amenable to gene editing and functional screening. The haploid nature, except for the disomic region, minimizes recessive masking effects, enabling clean interpretation of gene loss-of-function phenotypes. Widely adopted in functional genomics and CRISPR screening applications, HAP1 cells provide a physiologically relevant yet tractable platform for investigating signaling pathways, ion channel function, and drug responses.
KCNK3 encodes TASK-1, a pH-sensitive background potassium channel belonging to the two-pore domain (K2P) family. TASK-1 channels generate a constitutive, outwardly rectifying K+ leak current that stabilizes the resting membrane potential and regulates cellular excitability. Their activity is strongly inhibited by extracellular acidification, providing a key mechanism for pH sensing. Upstream regulators include Gq-coupled receptors such as ADRA1A and CHRM1, which signal via phospholipase C (PLC) and protein kinase C (PKC) to phosphorylate and close the channel. TASK-1 also responds to hypoxia, volatile anesthetics, and local anesthetics. Functionally, it interacts with KCNK9 (TASK-3) to form heterodimers and with 14-3-3 adaptor proteins and cytoskeletal anchors that influence its trafficking and surface expression. Downstream, loss of TASK-1 conductance induces membrane depolarization, which in turn facilitates voltage-gated calcium entry, modulates excitation-contraction coupling, and affects neurotransmitter release.
In HAP1 cells, KCNK3 knockout eliminates the dominant background potassium leak mediated by TASK-1 channels, leading to a depolarized resting membrane potential and heightened sensitivity to extracellular pH and GPCR agonists. This model is particularly powerful because the near-haploid genome allows clear dissection of TASK-1’s role without confounding compensation from wild-type alleles, except in the disomic region. Researchers can directly link Gq-coupled receptor activation??via ADRA1A or CHRM1??to PKC-dependent channel closure and subsequent calcium signaling. Moreover, the knockout facilitates studies of hypoxia-induced responses and anesthetic pharmacology, as TASK-1 is a well-established target of volatile agents. The polyclonal population ensures biological diversity while maintaining robust loss-of-function across the entire cell pool.
These KCNK3 knockout cells are suitable for an array of applications, including patch-clamp electrophysiology to measure channel currents, membrane potential-sensitive dye assays to assess depolarization, and calcium imaging to track downstream signaling. They support pulmonary hypertension research by modeling the role of TASK-1 in hypoxic pulmonary vasoconstriction, as well as investigations of atrial fibrillation and sleep apnea. High-throughput screening for K2P channel modulators can be performed using viability assays under hypoxia, where TASK-1 activity influences cell survival. Complementary molecular analyses such as qRT-PCR and Western blotting enable verification of knockout status and tracking of pathway components. For further details on product validation, handling, and customization options, please contact Ascent Research.
