2. Academic Validation
  3. ASCL1 characterizes adrenergic neuroblastoma via its pioneer function and cooperation with core regulatory circuit factors

ASCL1 characterizes adrenergic neuroblastoma via its pioneer function and cooperation with core regulatory circuit factors

  • Cell Rep. 2023 Dec 5;42(12):113541. doi: 10.1016/j.celrep.2023.113541.
Lu Wang 1,  Tze King Tan 1,  Hyoju Kim 1,  Dennis Kappei 2,  Shi Hao Tan 1,  A Thomas Look 3,  Takaomi Sanda 4
Affiliations

Affiliations

  • 1 Cancer Science Institute of Singapore, Singapore 117599, Singapore.
  • 2 Cancer Science Institute of Singapore, Singapore 117599, Singapore; Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117596, Singapore; NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.
  • 3 Department of Pediatric Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02216, USA; Division of Pediatric Hematology/Oncology, Boston Children's Hospital, Boston, MA 02215, USA.
  • 4 Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Center for Cancer Research, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore; Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117599, Singapore. Electronic address: takaomi_sanda@u.nus.edu.
PMID: 38060444 DOI: 10.1016/j.celrep.2023.113541
Abstract

Neuroblastoma originates from developing neural crest and can interconvert between the mesenchymal (MES) and adrenergic (ADRN) states, each of which are controlled by different sets of transcription factors forming the core regulatory circuit (CRC). However, the roles of CRC factors in induction and maintenance of specific state are poorly understood. Here, we demonstrate that overexpression of ASCL1, an ADRN CRC factor, in MES neuroblastoma cells opens closed chromatin at the promoters of key ADRN genes, accompanied by epigenetic activation and establishment of enhancer-promoter interactions, initiating the ADRN gene expression program. ASCL1 inhibits the transforming growth factor β-SMAD2/3 pathway but activates the bone morphogenetic protein SMAD1-ID3/4 pathway. ASCL1 and other CRC members potentiate each other's activity, increasing the expression of the original targets and inducing a new set of genes, thereby fully inducing the ADRN program. Our results demonstrate that ASCL1 serves as a pioneer factor and cooperates with CRC factors to characterize the ADRN gene expression program.

Keywords

ASCL1; CP: Cancer; chromatin; core regulatory circuit; neuroblastoma; pioneer factor.

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