The MAP1S Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population derived from the Raji B-lymphocyte line, featuring targeted disruption of the MAP1S gene. This loss-of-function model provides a valuable tool for studying autophagy and microtubule-related processes in a human Burkitt lymphoma background. The polyclonal format preserves heterogeneity, enabling robust population-level analyses of MAP1S-dependent phenotypes. Researchers can employ this system to dissect the gene??s roles in cellular quality control and stress responses without the constraints of clonal selection, making it suitable for high-content screening and mechanistic studies.
The Raji cell line, an EBV-positive Burkitt lymphoma model originally established from an 11-year-old male, is widely used to investigate B-cell receptor signaling, lymphomagenesis, and viral oncogenesis. These suspension cells grow rapidly and retain key characteristics of transformed B lymphocytes, including active NF-??B and PI3K pathways. Their EBV positivity renders them particularly relevant for studying viral manipulation of host autophagy and apoptosis. As a well-characterized B-cell model, Raji cells provide a physiologically appropriate context to explore how MAP1S integrates cytoskeletal dynamics with autophagic degradation of damaged mitochondria and protein aggregates.
MAP1S encodes a microtubule-associated protein that functions as a selective autophagy receptor, directly binding LC3B and GABARAP family members to link ubiquitinated cargo to nascent autophagosomes. Its activity is regulated upstream by starvation, mTOR inhibition, and AMPK signaling, and it acts downstream of these cues to promote LC3 lipidation, p62/SQSTM1 degradation, and mitochondrial clearance. MAP1S also interacts with tubulin, MAP1A, MAP1B, and HDAC6, positioning it at the intersection of microtubule stability and autophagic flux. Knockout of MAP1S disrupts basal autophagy and mitophagy, leading to accumulation of dysfunctional mitochondria and elevated apoptosis, effects that are particularly consequential in rapidly dividing lymphoma cells.
In the Raji B-lymphoma context, MAP1S disruption offers a unique window into autophagy-dependent survival mechanisms. EBV-positive Burkitt lymphoma cells are highly dependent on autophagy for metabolic adaptation and stress resistance; loss of MAP1S is expected to sensitize these cells to proteotoxic and mitochondrial stress, thereby altering B-cell receptor signaling outputs and apoptotic thresholds. This model enables dissection of how microtubule-associated autophagy receptors modulate oncogenic signaling networks, including mTOR and AMPK pathways, and provides a platform to test therapeutic strategies targeting autophagy in hematologic malignancies.
Typical research applications include autophagy flux assays using lysosomal inhibitors, Western blotting for LC3 lipidation and p62 turnover, immunofluorescence analysis of LC3 puncta and mitochondrial staining, flow cytometry for apoptosis and mitochondrial mass, RT-qPCR for MAP1S transcript levels, and cell viability or drug sensitivity screens. These cells are especially suited for mitophagy studies, cancer biology investigations, and drug discovery efforts aimed at identifying autophagy modulators. For additional product information, please contact Ascent Research.
