Heterogeneity and transcriptional drivers of triple-negative breast cancer

Cell Rep. 2023 Dec 26;42(12):113564. doi: 10.1016/j.celrep.2023.113564. Epub 2023 Dec 14.

Abstract

Triple-negative breast cancer (TNBC) is a heterogeneous disease with limited treatment options. To characterize TNBC heterogeneity, we defined transcriptional, epigenetic, and metabolic subtypes and subtype-driving super-enhancers and transcription factors by combining functional and molecular profiling with computational analyses. Single-cell RNA sequencing revealed relative homogeneity of the major transcriptional subtypes (luminal, basal, and mesenchymal) within samples. We found that mesenchymal TNBCs share features with mesenchymal neuroblastoma and rhabdoid tumors and that the PRRX1 transcription factor is a key driver of these tumors. PRRX1 is sufficient for inducing mesenchymal features in basal but not in luminal TNBC cells via reprogramming super-enhancer landscapes, but it is not required for mesenchymal state maintenance or for cellular viability. Our comprehensive, large-scale, multiplatform, multiomics study of both experimental and clinical TNBC is an important resource for the scientific and clinical research communities and opens venues for future investigation.

Keywords: CP: Cancer; triple-negative breast cancer; tumor heterogeneity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Gene Expression Regulation, Neoplastic
  • Homeodomain Proteins / metabolism
  • Humans
  • Transcription Factors / metabolism
  • Triple Negative Breast Neoplasms* / pathology

Substances

  • Transcription Factors
  • PRRX1 protein, human
  • Homeodomain Proteins