The IMMP1L Knockout HAP1 Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the IMMP1L gene in the near-haploid HAP1 human cell line. This pool of edited cells is provided as a heterogeneous population carrying targeted gene disruptions introduced by CRISPR/Cas9, enabling loss-of-function studies without clonal selection. The polyclonal format reduces clone-specific artifacts and allows assessment of gene function in a diverse genetic background, making it suitable for pooled functional genomics and drug screening applications.
The HAP1 host cell line is a near-haploid human chronic myeloid leukemia (CML) hematopoietic cell line derived from KBM-7 patient cells. With a near-haploid karyotype and disomy for chromosome 8, HAP1 cells exhibit adherent, fibroblast-like morphology and serve as a robust platform for haploid genetic screens. Their hematopoietic progenitor origin and stable growth characteristics make them particularly valuable for investigating gene function in processes relevant to hematopoiesis and mitochondrial biology, where gene dosage effects can be directly assessed.
IMMP1L encodes a catalytic subunit of the mitochondrial inner membrane protease (IMP) complex, which is essential for processing nuclear-encoded mitochondrial proteins after their import. The gene is transcriptionally regulated by PGC-1?? and NRF-1, key drivers of mitochondrial biogenesis. IMMP1L works in concert with its partner IMMP2L and interacts with the TIM23 translocase and mitochondrial processing peptidase (MPP) to cleave signal peptides from substrates such as CYC1 and UQCRFS1, components of respiratory chain complex III, and MICOS complex subunits. Disruption of IMMP1L thereby impairs the maturation of these proteins, leading to defective assembly of oxidative phosphorylation (OXPHOS) complexes and compromised mitochondrial respiration.
In the HAP1 near-haploid background, knockout of IMMP1L yields a highly penetrant loss-of-function phenotype because there is no second functional allele to compensate. This model directly links a defect in inner membrane proteolysis to mitochondrial dysfunction, recapitulating features of mitochondrial encephalopathies and respiratory chain deficiencies. The combination of haploid genetics and targeted gene disruption facilitates the dissection of protein import and assembly pathways, offering a clean system to study the consequences of IMP complex inactivation on mitochondrial network morphology and bioenergetics.
This polyclonal knockout cell population is suited for a variety of experimental applications, including functional dissection of mitochondrial protein processing, investigation of respiratory chain assembly, and screening for small molecules that can bypass IMP deficiency. Typical assays include western blotting for CYC1 precursor accumulation, Seahorse respirometry to measure oxygen consumption, mitochondrial import assays with radiolabeled precursors, immunofluorescence to visualize mitochondrial network changes, and quantitative proteomics of mitochondrial fractions to identify unprocessed substrates. By providing a robust loss-of-function model, these cells support both mechanistic studies and translational research into mitochondrial disorders. For further technical details or to discuss custom gene-editing services, please contact Ascent Research.
