The GUCA2A Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population designed to disrupt the human GUCA2A gene in the near-haploid HAP1 cell line. This polyclonal format avoids clonal selection bias, providing a heterogeneous pool of cells with targeted gene disruption for robust functional comparisons. It serves as a constitutive loss-of-function model, suitable for bulk assays and pooled screens without requiring monoclonal isolation.
The HAP1 cell line originates from a KBM-7 chronic myeloid leukemia patient and maintains a near-haploid karyotype with adherent growth characteristics. Its haploid nature simplifies CRISPR/Cas9 genome editing, establishing it as a widely adopted platform for functional genomics, drug target validation, and signaling pathway dissection. Despite its hematopoietic origin, HAP1 cells retain expression of evolutionarily conserved signaling components, enabling heterologous pathway analysis.
GUCA2A encodes preproguanylin, which is proteolytically processed by furin-like proprotein convertases to mature guanylin??the endogenous agonist of guanylate cyclase C (GUCY2C). Ligand?Creceptor binding stimulates cGMP synthesis, activating protein kinase G (PKG). PKG directly phosphorylates CFTR chloride channels and inhibits NHE3 sodium-proton exchangers, promoting net fluid secretion. Upstream regulation involves the CDX2 transcription factor and bacterial metabolites such as butyrate, while downstream crosstalk with MAPK/ERK and Wnt/??-catenin pathways coordinates proliferation and epithelial homeostasis.
In the haploid HAP1 background, GUCA2A knockout uncouples GUCY2C-dependent cGMP signaling from tissue-specific confounders, creating a simplified model to study receptor?Cligand pharmacology, second-messenger dynamics, and phosphorylation events on CFTR and NHE3. This system is particularly relevant for translational research on disorders of intestinal fluid imbalance??chronic constipation, secretory diarrhea, and inflammatory bowel disease??where GC-C signaling is aberrant. Additionally, the haploid context facilitates genetic interaction screens pertinent to colorectal cancer susceptibility.
These polyclonal knockout cells support a range of functional assays: RT-qPCR confirms GUCA2A disruption; western blotting for phospho-PKG and CFTR monitors downstream signaling; cGMP ELISA quantifies pathway activation; and cell proliferation or apoptosis assays reveal growth-regulatory roles. Co-culture designs can further explore paracrine guanylin signaling. For additional information, contact Ascent Research.
