DNAJC19 Knockout HT29 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the human colorectal adenocarcinoma cell line HT29. This product provides a loss-of-function model for the DNAJC19 gene, which encodes a mitochondrial inner membrane co-chaperone critical for TIM23 translocase function. The polyclonal pool contains a heterogeneous mixture of edited alleles, offering a robust system to dissect genotype-phenotype relationships without the artifacts of clonal selection. CRISPR/Cas9-mediated gene disruption enables researchers to interrogate the consequences of DNAJC19 deletion on mitochondrial protein homeostasis and cellular metabolism in a cancer-relevant background.
The HT29 cell line was established from a primary colorectal adenocarcinoma of a 44-year-old female. These cells are a widely used intestinal epithelial model that retains the ability to differentiate into polarized monolayers with brush-border features, making them suitable for studies of epithelial barrier function, drug transport, and colon cancer biology. HT29 cells exhibit a glycolytic metabolism characteristic of the Warburg effect, coupled with functional mitochondria, thus providing a physiologically relevant system to investigate how oncogenic transformation intersects with mitochondrial import and lipid remodeling.
DNAJC19 functions as a co-chaperone that interacts directly with the core TIM23 complex, comprising TIMM23, TIMM17A, PAM16, and the matrix chaperone mtHSP70 (HSPA9), along with its nucleotide exchange factor GRPEL1. It facilitates the ATP-dependent translocation of nuclear-encoded mitochondrial precursor proteins and is specifically required for sorting of multi-pass carrier proteins destined for the inner membrane. Mechanistically, DNAJC19 couples protein import to cardiolipin metabolism by engaging with prohibitin complexes and cardiolipin itself. Disruption of DNAJC19 impairs the assembly of respiratory chain supercomplexes, reduces mitochondrial membrane potential, and triggers downstream quality control mediated by proteases such as YME1L, AFG3L2, and SPG7. Upstream, DNAJC19 expression is regulated by PGC-1??, NRF1, and TFAM as part of the mitochondrial biogenesis program, and is also influenced by stress-responsive pathways involving HIF1??, p53, AMPK, and mTORC1. Downstream targets include members of the SLC25A mitochondrial carrier family, HSP60, and cardiolipin-remodeled supercomplexes, linking this co-chaperone to broad mitochondrial functions.
In the HT29 colorectal cancer background, loss of DNAJC19 presents a unique opportunity to explore the intersection of mitochondrial protein import and oncogenic metabolism. Given that HT29 cells rely on both glycolysis and oxidative phosphorylation, DNAJC19 disruption can unmask vulnerabilities related to mitochondrial protein quality control and cardiolipin-dependent cristae morphology. This model is particularly relevant for studying how mitochondrial dysfunction influences cancer cell proliferation, apoptosis sensitivity, and metabolic reprogramming. The polyclonal nature of the knockout population also allows researchers to average out clonal variation, yielding more reproducible phenotypes in pooled functional assays.
Applications for this knockout model span mitochondrial disease modeling, particularly dilated cardiomyopathy with ataxia (DCMA) and 3-methylglutaconic aciduria type V, as well as fundamental investigations into TIM23-mediated import and cardiolipin remodeling. Researchers can employ Western blotting and Blue-native PAGE to assess respiratory complex assembly, immunofluorescence and electron microscopy to examine mitochondrial morphology, and Seahorse respirometry to measure oxygen consumption and extracellular acidification rates. Co-immunoprecipitation with interacting factors such as TIMM23 and mtHSP70 permits dissection of translocase dynamics, while mass spectrometry-based cardiolipin quantification reveals lipid remodeling defects. Additional assays include protein import kinetics, RT-qPCR for target gene expression, and flow cytometry for mitochondrial membrane potential and apoptosis. For comprehensive technical details or assistance, please contact Ascent Research.
