The DMP1 Knockout HAP1 Polyclonal Cells are a population of CRISPR/Cas9-edited HAP1 cells that carry targeted disruptions in the DMP1 gene. This polyclonal knockout pool provides a genetically heterogeneous loss-of-function model suitable for studying dentin matrix protein 1 (DMP1) function in biomineralization and signal transduction. Unlike clonal lines, polyclonal populations maintain broader representation of editing outcomes, offering robust average phenotypes for functional genomics screens and pathway analyses.
The parental HAP1 cell line is a human near-haploid line derived from the KBM-7 chronic myelogenous leukemia (CML) background. Its haploid karyotype makes it a powerful platform for genetic screens, as only one allele needs to be disrupted to generate a complete knockout phenotype, simplifying genotype-phenotype correlations. These cells retain key signaling pathways relevant to hematopoietic malignancies while providing a clean genetic background for investigating gene function in ectopic mineralization studies.
DMP1 encodes an extracellular matrix phosphoprotein that promotes dentin and bone mineralization by binding hydroxyapatite and regulating phosphate homeostasis. Its expression is activated by RUNX2, BMP2, and 1,25-dihydroxyvitamin D3. DMP1 signals via integrin ??v??3 and CD44, triggering FAK and MAPK/ERK pathways to control transcription of FGF23, MEPE, and DSPP. This connects local mineralization to systemic phosphate regulation through the FGF23-FGFR1-Klotho axis, with DMP1 also interacting with collagen type I and matrix metalloproteinases to integrate mechanical signals.
In the HAP1 background, DMP1 knockout disrupts integrin-mediated signaling and ECM-related gene expression, making these polyclonal cells a valuable tool for dissecting how DMP1 governs mineralization-independent functions in a haploid cellular environment. The ability to generate complete loss-of-function without allelic redundancy simplifies assessment of DMP1-dependent phospho-ERK induction, cell adhesion on hydroxyapatite substrates, and transcriptional responses. This model bridges basic biomineralization mechanisms with potential cancer-relevant pathways, given that DMP1 is expressed in some leukemic cells and may influence integrin-driven survival signals.
Applications include CRISPR-based genetic screens for biomineralization regulators, validation of drug targets for hypophosphatemic rickets, and dissection of ECM-integrin signaling. Users can validate knockout by Sanger sequencing, assess DMP1 and FGF23 expression by RT-qPCR, and confirm protein loss by western blot. Functional assays include phospho-ERK immunofluorescence, cell adhesion on hydroxyapatite, and alizarin red mineralization staining. For more information, contact Ascent Research.
