The BMP2K Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the BMP2K gene in the near-haploid human HAP1 cell line. This loss-of-function model enables investigation of BMP2K-mediated signaling and endocytic processes without the need for clonal isolation, providing a genetically heterogeneous population that maintains the near-haploid genetic background. The polyclonal format minimizes potential clone-specific artifacts and offers a robust tool for functional genomics studies.
HAP1 cells are a near-haploid human cell line derived from the KBM-7 chronic myeloid leukemia line, characterized by an adherent morphology and a haploid karyotype except for a disomic chromosome 15. Their haploid nature facilitates straightforward gene disruption and allows for clear genotype-phenotype correlations, making them an ideal platform for genetic screens and pathway analysis. As a hematopoietic model, HAP1 cells provide a relevant context for studying kinase signaling and endocytic trafficking in blood-derived cells.
BMP2K (BMP-2-inducible kinase) is a serine/threonine kinase that lies downstream of bone morphogenetic protein (BMP) signaling. Activated by BMP2 through BMPR1A/BMPR2 receptors and SMAD1/5/8 transcription factors, BMP2K phosphorylates the non-receptor tyrosine kinase BMX and associates with components of the clathrin-mediated endocytosis machinery, including clathrin heavy chain (CLTC) and the AP-2 adaptor complex subunit AP2M1. Through these interactions, BMP2K modulates the internalization of BMP receptors, thereby regulating the amplitude and duration of BMP signal transduction. Additional interacting partners such as CSNK2A1 further integrate BMP2K into broader signaling networks. This kinase thus serves as a critical node linking extracellular BMP signals to endocytic control of receptor availability and downstream osteoblast differentiation programs.
Disruption of BMP2K in the HAP1 background eliminates wild-type kinase function while preserving the advantages of the near-haploid system. This model is particularly valuable for dissecting the dual roles of BMP2K in both signal transduction and membrane trafficking. Functional studies can explore how loss of BMP2K affects BMP receptor endocytosis kinetics, SMAD phosphorylation dynamics, and downstream transcriptional responses. The hematopoietic origin of HAP1 cells also allows researchers to examine BMP2K function in a leukemia-relevant context, potentially revealing new aspects of BMP pathway modulation in blood cell biology.
The BMP2K Knockout HAP1 Polyclonal Cells are suitable for a wide range of applications, including western blotting to assess total and phospho-protein levels, immunofluorescence microscopy to visualize receptor distribution, endocytosis uptake assays using labeled ligands, phospho-SMAD detection by immunoblotting or imaging, co-immunoprecipitation to map protein interactions, RT-qPCR and RNA-seq for transcriptomic profiling, and BRE-luciferase reporter assays to measure BMP pathway activity. These cells support detailed mechanistic studies of BMP2K??s role in osteoblast differentiation, clathrin-mediated endocytosis, and kinase substrate identification. For further information, please contact Ascent Research.
