eLife (May 2016)

ERG signaling in prostate cancer is driven through PRMT5-dependent methylation of the Androgen Receptor

  • Zineb Mounir,
  • Joshua M Korn,
  • Thomas Westerling,
  • Fallon Lin,
  • Christina A Kirby,
  • Markus Schirle,
  • Gregg McAllister,
  • Greg Hoffman,
  • Nadire Ramadan,
  • Anke Hartung,
  • Yan Feng,
  • David Randal Kipp,
  • Christopher Quinn,
  • Michelle Fodor,
  • Jason Baird,
  • Marie Schoumacher,
  • Ronald Meyer,
  • James Deeds,
  • Gilles Buchwalter,
  • Travis Stams,
  • Nicholas Keen,
  • William R Sellers,
  • Myles Brown,
  • Raymond A Pagliarini

DOI
https://doi.org/10.7554/eLife.13964
Journal volume & issue
Vol. 5

Abstract

Read online

The TMPRSS2:ERG gene fusion is common in androgen receptor (AR) positive prostate cancers, yet its function remains poorly understood. From a screen for functionally relevant ERG interactors, we identify the arginine methyltransferase PRMT5. ERG recruits PRMT5 to AR-target genes, where PRMT5 methylates AR on arginine 761. This attenuates AR recruitment and transcription of genes expressed in differentiated prostate epithelium. The AR-inhibitory function of PRMT5 is restricted to TMPRSS2:ERG-positive prostate cancer cells. Mutation of this methylation site on AR results in a transcriptionally hyperactive AR, suggesting that the proliferative effects of ERG and PRMT5 are mediated through attenuating AR’s ability to induce genes normally involved in lineage differentiation. This provides a rationale for targeting PRMT5 in TMPRSS2:ERG positive prostate cancers. Moreover, methylation of AR at arginine 761 highlights a mechanism for how the ERG oncogene may coax AR towards inducing proliferation versus differentiation.

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