4.8 Article

ARID1A determines luminal identity and therapeutic response in estrogen-receptor-positive breast cancer

Journal

NATURE GENETICS
Volume 52, Issue 2, Pages 198-+

Publisher

NATURE PORTFOLIO
DOI: 10.1038/s41588-019-0554-0

Keywords

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Funding

  1. National Institutes of Health [P30 CA008748, RO1CA190642-01A1]
  2. Breast Cancer Research Foundation [BCRF-17-013]
  3. Stand Up to Cancer (Cancer Drug Combination Convergence Team) grant [SU2C 2015-004]
  4. V Foundation [D2015-036]
  5. National Science Foundation [PHY1545853]
  6. U54 award [CA209975-01]
  7. MSK Society Scholar Prize
  8. [NCI K00CA212478]

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Mutations in ARID1A, a subunit of the SWI/SNF chromatin remodeling complex, are the most common alterations of the SWI/SNF complex in estrogen-receptor-positive (ER+) breast cancer. We identify that ARID1A inactivating mutations are present at a high frequency in advanced endocrine-resistant ER+ breast cancer. An epigenome CRISPR-CAS9 knockout (KO) screen identifies ARID1A as the top candidate whose loss determines resistance to the ER degrader fulvestrant. ARID1A inactivation in cells and in patients leads to resistance to ER degraders by facilitating a switch from ER-dependent luminal cells to ER-independent basal-like cells. Cellular plasticity is mediated by loss of ARID1A-dependent SWI/SNF complex targeting to genomic sites of the luminal lineage-determining transcription factors including ER, forkhead box protein A1 (FOXA1) and GATA-binding factor 3 (GATA3). ARID1A also regulates genome-wide ER-FOXA1 chromatin interactions and ER-dependent transcription. Altogether, we uncover a critical role for ARID1A in maintaining luminal cell identity and endocrine therapeutic response in ER+ breast cancer. A CRISPR-CAS9 screen, analysis of patient data, and functional in vivo and in vitro experiments identify a critical role for ARID1A in determining breast luminal cell identity and endocrine therapeutic response in estrogen-receptor-positive breast cancer.

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