ArticlebioRxiv : the preprint server for biology2025
Spatially-resolved Photoproximity Profiling of MYC Identifies a MYC-BAF Liability in Cancer Cells.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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8 authors.
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Abstract
The c-MYC transcription factor is aberrantly expressed in most human cancers to enhance expression of proliferative gene programs. Owing to its pseudo-ordered structure and reliance on extensive and dynamic protein-protein interactions in distinct transcriptional regulatory complexes, defining context-specific MYC interactors has remained challenging. Therefore, mapping MYC-centered complex topologies in disease relevant models could identify components critical for its function which may serve as therapeutic targets in MYC-driven cancers. Here, we present a matched pair of photoproximity probes coupled with quantitative proteomics which enable context-dependent mapping of protein complex topology inside cells. We applied this spatially resolved, intracellular photoproximity (siPROX) profiling workflow to map MYC interactomes across temporal, spatial and disease-relevant contexts. Basal and inhibitor-treated profiles confirmed interactions with a wide range of known chromatin-associated transcriptional regulatory factors that define the extended MYC transcriptional bubble in live cells. Time-resolved mapping of inhibitor treated cells identified dynamic remodeling of numerous transcriptional regulatory factors and identified several BAF complex members (e.g., PBRM1 and SMARCC1)
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