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Liu, Zhaoqi; Yoshimi, Akihide; Wang, Jiguang; Cho, Hana; Chun-Wei Lee, Stanley; Ki, Michelle; Bitner, Lillian; Chu, Timothy; Shah, Harshal; Liu, Bo; Mato, Anthony R; Ruvolo, Peter; Fabbri, Giulia; Pasqualucci, Laura; Abdel-Wahab, Omar; Rabadan, Raul
Cancer discovery, 06/2020, Letnik: 10, Številka: 6Journal Article
Although mutations in the gene encoding the RNA splicing factor SF3B1 are frequent in multiple cancers, their functional effects and therapeutic dependencies are poorly understood. Here, we characterize 98 tumors and 12 isogenic cell lines harboring hotspot mutations, identifying hundreds of cryptic 3' splice sites common and specific to different cancer types. Regulatory network analysis revealed that the most common mutation activates MYC via effects conserved across human and mouse cells. mutations promote decay of transcripts encoding the protein phosphatase 2A (PP2A) subunit PPP2R5A, increasing MYC S62 and BCL2 S70 phosphorylation which, in turn, promotes MYC protein stability and impair apoptosis, respectively. Genetic PPP2R5A restoration or pharmacologic PP2A activation impaired SF3B1-mutant tumorigenesis, elucidating a therapeutic approach to aberrant splicing by mutant SF3B1. SIGNIFICANCE: Here, we identify that mutations in , the most commonly mutated splicing factor gene across cancers, alter splicing of a specific subunit of the PP2A serine/threonine phosphatase complex to confer post-translational MYC and BCL2 activation, which is therapeutically intervenable using an FDA-approved drug. . .
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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