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Science Advances

Science Advances

IF: 11.7
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The super elongation complex drives transcriptional addiction in MYCN -amplified neuroblastoma

Published:29 March 2023 DOI: 10.1126/sciadv.adf0005 PMID: 36989355
Donghai?Wang, Zhinang?Yin, Honghong?Wang, Liyuan?Wang, Tianyu?Li, Ruijing?Xiao, Ting?Xie, Ruyi?Han, Rui?Dong, Hudan?Liu, Kaiwei?Liang, Guoliang?Qing

Abstract

MYCN amplification in neuroblastoma leads to aberrant expression of MYCN oncoprotein, which binds active genes promoting transcriptional amplification. Yet, how MYCN coordinates transcription elongation to meet productive transcriptional amplification and which elongation machinery represents MYCN-driven vulnerability remain to be identified. We conducted a targeted screen of transcription elongation factors and identified the super elongation complex (SEC) as a unique vulnerability in MYCN-amplified neuroblastomas. MYCN directly binds EAF1 and recruits SEC to enhance processive transcription elongation. Depletion of EAF1 or AFF1/AFF4, another core subunit of SEC, leads to a global reduction in transcription elongation and elicits selective apoptosis of MYCN-amplified neuroblastoma cells. A combination screen reveals SEC inhibition synergistically potentiates the therapeutic efficacies of FDA-approved BCL-2 antagonist ABT-199, in part due to suppression of MCL1 expression, both in MYCN-amplified neuroblastoma cells and in patient-derived xenografts. These findings identify disruption of the MYCN-SEC regulatory axis as a promising therapeutic strategy in neuroblastoma.

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