Dual roles of RNF2 in melanoma progression

Kunal Rai, Kadir C. Akdemir, Lawrence N. Kwong, Petko Fiziev, Chang Jiun Wu, Emily Z. Keung, Sneha Sharma, Neha S. Samant, Maura Williams, Jacob B. Axelrad, Amiksha Shah, Dong Yang, Elizabeth A. Grimm, Michelle C. Barton, Denai R. Milton, Timothy P. Heffernan, James W. Horner, Suhendan Ekmekcioglu, Alexander J. Lazar, Jason ErnstLynda Chin

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

Epigenetic regulators have emerged as critical factors governing the biology of cancer. Here, in the context of melanoma, we show that RNF2 is prognostic, exhibiting progression-correlated expression in human melanocytic neoplasms. Through a series of complementary gain-of-function and loss-of-function studies in mouse and human systems, we establish that RNF2 is oncogenic and prometastatic. Mechanistically, RNF2-mediated invasive behavior is dependent on its ability to monoubiquitinate H2AK119 at the promoter of LTBP2 , resulting in silencing of this negative regulator of TGFβ signaling. In contrast, RNF2′s oncogenic activity does not require its catalytic activity nor does it derive from its canonical gene repression function. Instead, RNF2 drives proliferation through direct transcriptional upregulation of the cell-cycle regulator CCND2. We further show that MEK1- mediated phosphorylation of RNF2 promotes recruitment of activating histone modifiers UTX and p300 to a subset of poised promoters, which activates gene expression. In summary, RNF2 regulates distinct biologic processes in the genesis and progression of melanoma via different molecular mechanisms. Significance: The role of epigenetic regulators in cancer progression is being increasingly appreciated. We show novel roles for RNF2 in melanoma tumorigenesis and metastasis, albeit via different mechanisms. Our findings support the notion that epigenetic regulators, such as RNF2, directly and functionally control powerful gene networks that are vital in multiple cancer processes.

Original languageEnglish (US)
Pages (from-to)1314-1327
Number of pages14
JournalCancer discovery
Volume5
Issue number12
DOIs
StatePublished - Dec 2015
Externally publishedYes

ASJC Scopus subject areas

  • Oncology

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