The GPHN Knockout SK-HEP-1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal population of SK-HEP-1 cells harboring targeted disruption of the GPHN gene. This heterogeneous knockout pool allows researchers to study gephyrin loss-of-function effects in a human liver adenocarcinoma model without clonal bias.
SK-HEP-1 is an immortalized human liver adenocarcinoma cell line widely used in hepatocellular carcinoma research and drug metabolism studies. Its robust growth and amenability to genetic manipulation make it an effective platform for generating knockout models and performing downstream cellular assays.
Gephyrin, the protein encoded by GPHN, functions as the principal scaffolding molecule at inhibitory postsynaptic sites, anchoring glycine receptors (GLRB) and GABA_A receptors (GABRA subunits) to the cytoskeleton via direct interactions with tubulin and actin. Its postsynaptic clustering and stability are dynamically regulated by phosphorylation through ERK and GSK3??, as well as by mTOR-dependent signaling, and its recruitment to synapses is facilitated by the guanine nucleotide exchange factor collybistin. Additionally, gephyrin forms complexes with the synaptic adhesion molecule neuroligin 2, a key organizer of inhibitory synapses. In all cell types, gephyrin also catalyzes the insertion of molybdenum into the molybdopterin backbone, a vital step in molybdenum cofactor biosynthesis that supports the activity of enzymes such as sulfite oxidase and xanthine dehydrogenase. Consequently, CRISPR-mediated disruption of GPHN abrogates both the scaffolding-dependent receptor clustering and the biosynthesis of MoCo, leading to multifaceted cellular consequences.
In the non-neuronal SK-HEP-1 liver adenocarcinoma background, which lacks endogenous inhibitory synapses, GPHN knockout serves as a clean model to dissect gephyrin??s enzymatic role in molybdenum cofactor biosynthesis and its potential crosstalk with key prosurvival and metabolic pathways driven by ERK, GSK3??, and mTOR. This cell line provides an opportunity to investigate how gephyrin deficiency influences liver cancer cell metabolism, proliferation, or resistance to oxidative stress, offering insights that extend beyond synaptic functions. The polyclonal knockout population captures a range of editing outcomes, enabling robust assessment of overall biological effects in a heterogeneous cell pool.
Typical applications include modeling molybdenum cofactor deficiency, evaluating off-target CRISPR effects in non-neuronal cells, and studying gephyrin-related neurodevelopmental defects in a simplified system. Compatible assays encompass western blotting, RT-qPCR, immunofluorescence, molybdenum cofactor enzyme activity measurements, cell proliferation assays, and RNA-seq. For further details, contact Ascent Research.
