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CARMA: CARM1 methylation of SWI/SNF in breast cancer

Xiaofeng Wang1, Charles W M Roberts1

  • 1Department of Pediatric Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA; Division of Hematology/Oncology, Boston Children's Hospital, Boston, MA 02115, USA; Department of Pediatrics, Harvard Medical School, Boston, MA 02115, USA.

Cancer Cell
|January 18, 2014
PubMed

Insights

CARM1, a protein arginine methyltransferase, modifies BAF155, a key part of the SWI/SNF complex. This process promotes breast cancer growth and spread by affecting c-Myc pathway genes.

Area of Science:

  • Molecular oncology
  • Epigenetics
  • Cancer biology

Background:

  • The SWI/SNF complex is crucial for chromatin remodeling and acts as a tumor suppressor.
  • Dysregulation of chromatin remodeling is implicated in various cancers, including breast cancer.
  • The role of specific post-translational modifications in SWI/SNF function and cancer is an active area of research.

Purpose of the Study:

  • To investigate the specific interactions and functions of CARM1 (coactivator-associated arginine methyltransferase 1) in breast cancer.
  • To determine if CARM1 directly modifies core subunits of the SWI/SNF complex.
  • To elucidate the downstream effects of CARM1-mediated modification on gene expression and cancer progression.

Main Methods:

  • Mass spectrometry to identify CARM1 targets.
  • Western blotting and immunoprecipitation to confirm protein interactions and modifications.
  • Chromatin immunoprecipitation sequencing (ChIP-seq) to analyze gene targeting.
  • In vitro and in vivo assays to assess breast cancer progression and metastasis.

Main Results:

  • CARM1 specifically methylates BAF155 (also known as SMARCC1), a core subunit of the SWI/SNF complex.
  • This methylation event enhances the recruitment of BAF155 to the promoter regions of genes within the c-Myc signaling pathway.
  • CARM1-mediated BAF155 modification leads to increased expression of c-Myc target genes, promoting breast cancer cell proliferation and metastasis in preclinical models.

Conclusions:

  • CARM1-mediated methylation of BAF155 is a critical regulatory mechanism in breast cancer.
  • The modification facilitates oncogenic signaling by targeting the SWI/SNF complex to c-Myc pathway genes.
  • Targeting the CARM1-BAF155 axis presents a potential therapeutic strategy for aggressive breast cancer.

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