Cross-cohort analysis identifies a TEAD4 {leftrightarrow} MYCN positive-feedback loop as the core regulatory element of high-risk neuroblastoma [Research Articles]

High-risk neuroblastomas show a paucity of recurrent somatic mutations at diagnosis. As a result, the molecular basis for this aggressive phenotype remains elusive. Recent progress in regulatory network analysis helped us elucidate disease-driving mechanisms downstream of genomic alterations, including recurrent chromosomal alterations. Our analysis identified three molecular subtypes of high-risk neuroblastomas, consistent with chromosomal alterations, and identified subtype-specific master regulator (MR) proteins that were conserved across independent cohorts. A 10 protein transcriptional module - centered around a TEAD4 MYCN positive-feedback loop - emerged as the regulatory driver of the high-risk subtype associated with MYCN amplification. Silencing of either gene collapsed MYCN-amplified (MYCNAmp) neuroblastoma transcriptional hallmarks and abrogated viability in vitro and in vivo. Consistently, TEAD4 emerged as a robust prognostic marker of poor survival, with activity independent of the canonical Hippo pathway transcriptional co-activators, YAP and TAZ. These results suggest novel therapeutic strategies for the large subset of MYCN deregulated neuroblastomas.

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