The HNF4A Knockout HEK293T Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal cell population in which the HNF4A gene has been disrupted to create a loss-of-function model for studying this critical nuclear receptor transcription factor. Delivered as a heterogeneous pool of edited cells, this product provides a versatile system for investigating HNF4A-dependent transcriptional regulation without the confounding effects of clonal selection, enabling interrogation of gene function in a human embryonic kidney background. Polyclonal knockout populations are particularly suited for pooled functional screens, bulk transcriptomic profiling, and biochemical assays requiring sufficient material from a genetically diverse knockout background.
This knockout model is established in the HEK293T cell line, a widely utilized host derived from HEK293 cells that stably expresses the SV40 large T antigen. These adherent epithelial cells, originally isolated from human embryonic kidney tissue, are a cornerstone of biomedical research due to their ease of transfection, robust protein production capabilities, and broad applications in recombinant protein expression, viral packaging, and the study of signal transduction and gene regulatory mechanisms. The HEK293T background provides a well-characterized, tractable platform in which to dissect the exogenous activities of HNF4A, a transcription factor not endogenously expressed as a master hepatic regulator, thus allowing clear attribution of functional outcomes to the introduced or remaining HNF4A pathways.
HNF4A (hepatocyte nuclear factor 4 alpha) functions as a master transcriptional regulator essential for hepatocyte differentiation and systemic metabolic control. It orchestrates expression of genes governing glucose production, fatty acid oxidation, cholesterol homeostasis, and bile acid biosynthesis. Mechanistically, HNF4A binds DR1 response elements in target gene promoters, often forming heterodimers with RXR and recruiting coactivators such as PGC-1??, SRC-1, and CBP/p300 to drive transcription. Its activity is modulated by upstream signals including insulin, AMPK, PGC-1??, and FOXA1/FOXA2, and it directly activates downstream effectors like HNF1A, APOB, APOA1, CYP7A1, PEPCK, GLUT2, and ALB. HNF4A also interacts with corepressors NCOR1 and SMRT, fine-tuning metabolic gene programs. Representative pathway axes include HNF4A/PGC-1????gluconeogenic genes, HNF4A/RXR??lipid metabolism genes, and HNF4A??CYP7A1??bile acid synthesis.
Knockout of HNF4A in HEK293T cells eliminates its transcriptional influence, enabling researchers to dissect its regulatory roles in a non-hepatic context. This model is invaluable for ectopic expression studies, where reintroducing HNF4A variants can map functional domains and disease-associated mutations, and for examining cross-talk between HNF4A and signaling cascades active in kidney-derived cells, including the Wnt/??-catenin, JAK-STAT, MAPK, insulin, and AMPK pathways. By ablating HNF4A-mediated transcription, the cells facilitate exploration of its contributions to pathologies such as maturity-onset diabetes of the young type 1 (MODY1), hepatocellular carcinoma, non-alcoholic fatty liver disease, and metabolic syndrome, particularly in assessing how loss of HNF4A-dependent gene signatures affects metabolic state and disease phenotypes.
Typical experimental applications encompass transcriptional regulatory network analysis through ChIP-qPCR at DR1 sites, RT-qPCR profiling of target genes (e.g., APOB, HNF1A), reporter gene assays using HNF4A-responsive luciferase constructs, and global transcriptome analysis via RNA-seq. Protein-level investigations by western blotting and immunofluorescence permit assessment of HNF4A and downstream effector abundance and localization, while metabolic assays measuring glucose uptake and lipid accumulation provide functional readouts. These cells are also suited for drug metabolism studies evaluating CYP3A4 and UGT1A1 regulation, hepatotoxicity screening, and modeling hepatic differentiation pathways. For additional technical details or ordering information, please contact Ascent Research.
