The GYS1 Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HAP1 human near-haploid fibroblast-like cell line, engineered for disruption of the GYS1 gene. This loss-of-function model facilitates investigation of glycogen metabolism, insulin signaling, and related disease mechanisms without clonal selection bias, leveraging the genetic tractability of the host line.
HAP1 cells originate from the KBM-7 chronic myeloid leukemia line and maintain an adherent, near-haploid karyotype, which simplifies gene disruption and enables stable genetic backgrounds for functional genomics. These characteristics make HAP1 a preferred platform for drug target validation, signal transduction studies, and metabolic pathway dissection.
GYS1 encodes glycogen synthase 1, the rate-limiting enzyme in glycogenesis that transfers glucose from UDP-glucose to a glycogen primer. Its activity is tightly controlled: insulin signaling activates AKT1, which phosphorylates and inhibits GSK-3??, relieving inhibitory phosphorylation of GYS1. Conversely, AMPK and GSK-3?? directly phosphorylate and inactivate GYS1. Activation is mediated by protein phosphatase 1 (PP1) in complex with the regulatory subunit PPP1R3A. GYS1 also interacts with glycogenin to initiate glycogen granule formation. Disruption of GYS1 abrogates glycogen synthesis, impacting glucose homeostasis and metabolic signaling.
In the HAP1 background, GYS1 knockout provides a clean cellular system to study insulin and energy-sensing pathways without compensatory glycogen production. The polyclonal population captures diverse loss-of-function alleles, enabling robust phenotype assessment. This model is particularly valuable for studying glycogen storage disease type 0, type 2 diabetes-related metabolic defects, and screening small-molecule modulators of glycogen metabolism.
Typical applications include western blotting for GYS1 and phospho-GSK-3??, PAS staining for glycogen, glycogen synthase enzymatic activity assays, RT-qPCR of GYS1, and glucose uptake assays. These polyclonal knockout cells are ideal for insulin signaling studies, drug screening for glycogen storage disorders, and investigating AMPK-mediated energy homeostasis. For additional technical information or custom projects, please contact Ascent Research.
