KMT2C mediates the estrogen dependence of breast cancer through regulation of ERα enhancer function Academic Article uri icon


MeSH Major

  • Antineoplastic Agents
  • DNA, Neoplasm
  • Mutation
  • Neoplasms
  • Protein Kinase Inhibitors
  • Proto-Oncogene Proteins c-akt
  • Pyrimidines
  • Pyrroles


  • Estrogen receptor alpha (ERα) is a ligand-activated nuclear receptor that directs proliferation and differentiation in selected cancer cell types including mammary-derived carcinomas. These master-regulatory functions of ERα require trans-acting elements such as the pioneer factor FOXA1 to establish a genomic landscape conducive to ERα control. Here, we identify the H3K4 methyltransferase KMT2C as necessary for hormone-driven ERα activity and breast cancer proliferation. KMT2C knockdown suppresses estrogen-dependent gene expression and causes H3K4me1 and H3K27ac loss selectively at ERα enhancers. Correspondingly, KMT2C loss impairs estrogen-driven breast cancer proliferation but has no effect on ER- breast cells. Whereas KMT2C loss disrupts estrogen-driven proliferation, it conversely promotes tumor outgrowth under hormone-depleted conditions. In accordance, KMT2C is one of the most frequently mutated genes in ER-positive breast cancer with KMT2C deletion correlating with significantly shorter progression-free survival on anti-estrogen therapy. From a therapeutic standpoint, KMT2C-depleted cells that develop hormone-independence retain their dependence on ERα, displaying ongoing sensitivity to ERα antagonists. We conclude that KMT2C is a key regulator of ERα activity whose loss uncouples breast cancer proliferation from hormone abundance.

publication date

  • May 14, 2018



  • Academic Article



  • eng

Digital Object Identifier (DOI)

  • 10.1038/s41388-018-0273-5

PubMed ID

  • 29755131

Additional Document Info

start page

  • 1

end page

  • 19