AUH Knockout HT29 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HT29 colorectal adenocarcinoma cell line, featuring targeted disruption of the AUH gene locus. This loss-of-function model provides a defined genetic background for dissecting AUH??s dual biochemical activities??its role as a methylglutaconyl-CoA hydratase in the mitochondrial leucine degradation pathway and its capacity to bind AU-rich element (ARE)-containing mRNAs, influencing transcript stability. The polyclonal format preserves heterogeneous editing events across the population, enabling robust functional studies without clonal selection artifacts.
HT29 is a well-characterized human epithelial cell line isolated from a primary colorectal adenocarcinoma, extensively employed as an intestinal epithelial model. These cells retain key metabolic pathways and signaling networks relevant to colon carcinoma biology, including active branched-chain amino acid catabolism. Their epithelial origin makes them particularly suitable for investigating metabolic reprogramming and mitochondrial homeostasis in a cancer-relevant, anchorage-dependent context.
The AUH gene encodes a bifunctional enzyme that catalyzes the hydration of 3-methylglutaconyl-CoA to 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA), a critical step downstream of branched-chain aminotransferase (BCAT), the branched-chain ??-ketoacid dehydrogenase complex (BCKDH), isovaleryl-CoA dehydrogenase, and methylcrotonyl-CoA carboxylase. This reaction channels leucine-derived carbon into ketogenesis via HMG-CoA lyase and HMG-CoA synthase (HMGCS2), ultimately yielding acetoacetate and acetyl-CoA. AUH activity is regulated by leucine availability and mTORC1 signaling, and its transcription is co-activated by PGC-1??, linking nutrient sensing to mitochondrial function. Independently of its enzymatic role, AUH interacts with ARE-binding proteins such as KHSRP and HuR, modulating the stability of mRNAs involved in cell growth and stress responses.
Disruption of AUH in the HT29 cellular background creates a model that mirrors key aspects of 3-methylglutaconic aciduria type I (AUH deficiency), a disorder characterized by leucine metabolite accumulation and mitochondrial dysfunction. In these colonic epithelial cells, the absence of functional AUH perturbs the catabolic flux from leucine to HMG-CoA, potentially altering energy homeostasis and anapleurotic inputs for the TCA cycle. Moreover, loss of AUH??s RNA-binding activity may destabilize transcripts that govern epithelial differentiation and stress adaptation, providing a platform to investigate crosstalk between intermediary metabolism and post-transcriptional gene regulation in a cancer context.
This knockout cell model supports a wide array of experimental applications, including metabolic disease modeling, quantitative analysis of leucine flux via labeled substrate tracing, and mechanistic dissection of mRNA stability control through RNA immunoprecipitation and reporter assays. It is suitable for functional readouts such as AUH enzyme activity measurements, mitochondrial stress testing using Seahorse analysis, and immunofluorescence localization studies. The model also facilitates drug screening for compounds that restore metabolic balance or correct mRNA dysregulation. For further details, contact Ascent Research.
