HMBOX1 Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the near-haploid human HAP1 cell line, engineered to disrupt the HMBOX1 gene. This pool of edited cells provides a loss-of-function model for investigating the cellular and molecular consequences of HMBOX1 deficiency without the need for single-cell cloning. The polyclonal format preserves population-level heterogeneity while ensuring robust target-gene disruption, making it suitable for high-throughput genetic screens and mechanistic studies where rapid phenotype assessment is critical.
The HAP1 host cell line originates from the KBM-7 chronic myeloid leukemia (CML) line and exhibits a near-haploid karyotype in a fibroblast-like, adherent morphology. This genetic simplicity facilitates efficient gene editing and functional analysis, as a single targeting event can generate a null allele. HAP1 cells are widely employed in genetic screens, knockout validation, and cell-based assays due to their stable growth characteristics and compatibility with standard transfection and selection protocols.
HMBOX1 encodes a homeobox transcription factor that localizes to telomeres through direct interaction with double-stranded telomeric DNA and association with the shelterin complex, including TRF1, TRF2, TIN2, and POT1. It functions as a negative regulator of telomere length by inhibiting telomerase access or activity, a process critical for maintaining genomic stability. In addition, HMBOX1 modulates alternative splicing of pre-mRNAs, acting as a splicing regulatory factor. Its activity is influenced by shelterin components and influences downstream targets such as telomerase-dependent telomere elongation and splice variant expression.
In the HAP1 background, which models a leukemic cell environment, HMBOX1 knockout allows direct examination of telomere maintenance mechanisms and their disruption in cancer. The near-haploid state ensures that the knockout pool behaves as a homogeneous null population, facilitating clear interpretation of telomere length alterations, telomerase activity changes, and splicing defects. This model is particularly valuable for dissecting shelterin-telomerase interplay and identifying factors that govern telomere homeostasis in immortalized cells.
Researchers can employ HMBOX1 Knockout HAP1 Polyclonal Cells for diverse applications, including TRF analysis to measure telomere length distributions, TRAP assays to quantify telomerase activity, and RT-qPCR for telomere length and splicing event validation. The cells are also amenable to immunofluorescence for telomere dysfunction-induced foci (TIF) detection, Western blotting for shelterin component expression, and RNA-seq for global transcriptomic and splicing analysis. Additionally, cell proliferation assays can assess growth phenotypes associated with telomere dysfunction. This knockout model empowers functional genomics studies, telomere biology research, and screening of telomerase-targeted therapeutics. For additional information, please contact Ascent Research.
