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bioRxiv · 10.1101/2025.11.11.687869

Comparative ASCL1 interactome analysis reveals CDK2-Cyclin A2 as suppressors of differentiation in MYCN-amplified neuroblastoma

Mykhaylechko, L.·Woods, L. M.·Papachristou, E. K.·Gomez, R. L.·Ramachandran, R.·Lundie-Brown, J.·Marcos, D.·Drummond, R.·Ali, F. R.·Carroll, J.·Philpott, A.
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Abstract

Neuroblastoma is a heterogeneous paediatric cancer arising from developmentally arrested neuronal precursors, where restoring differentiation offers therapeutic promise. ASCL1, a pro-neural transcription factor, is widely expressed in neuroblastoma and can drive either proliferation or differentiation depending on the cellular context. Here, we show that distinct MYCN-amplified neuroblastoma cell lines exhibit differing cell cycle and differentiation responses to ASCL1 overexpression. By comparing genome-wide ASCL1 chromatin binding, transcriptional changes, and protein-protein interactions, we found that ASCL1 binds more extensively to neuronal proteins in a cell line that is more susceptible to ASCL1-driven differentiation, but associates with cell cycle regulators in less responsive cells. We show that CDK2-Cyclin A2 bind ASCL1 in less responsive cells, with CDK-mediated phosphorylation of ASCL1 limiting the ability of ASCL1 to drive differentiation. Our study reveals that context-dependent interactions of ASCL1 with protein partners on the chromatin control its ability to re-engage a differentiation program in neuroblastoma.

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Mykhaylechko, L., Woods, L. M., Papachristou, E. K., Gomez, R. L., Ramachandran, R., Lundie-Brown, J., Marcos, D., Drummond, R., Ali, F. R., Carroll, J., Philpott, A.. 2025-11-13. Comparative ASCL1 interactome analysis reveals CDK2-Cyclin A2 as suppressors of differentiation in MYCN-amplified neuroblastoma. https://doi.org/10.1101/2025.11.11.687869

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