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Castel, Pau; Cheng, Alice; Cuevas-Navarro, Antonio; Everman, David B; Papageorge, Alex G; Simanshu, Dhirendra K; Tankka, Alexandra; Galeas, Jacqueline; Urisman, Anatoly; McCormick, Frank
Science (American Association for the Advancement of Science), 03/2019, Letnik: 363, Številka: 6432Journal Article
RIT1 oncoproteins have emerged as an etiologic factor in Noonan syndrome and cancer. Despite the resemblance of RIT1 to other members of the Ras small guanosine triphosphatases (GTPases), mutations affecting RIT1 are not found in the classic hotspots but rather in a region near the switch II domain of the protein. We used an isogenic germline knock-in mouse model to study the effects of RIT1 mutation at the organismal level, which resulted in a phenotype resembling Noonan syndrome. By mass spectrometry, we detected a RIT1 interactor, leucine zipper-like transcription regulator 1 (LZTR1), that acts as an adaptor for protein degradation. Pathogenic mutations affecting either RIT1 or LZTR1 resulted in incomplete degradation of RIT1. This led to RIT1 accumulation and dysregulated growth factor signaling responses. Our results highlight a mechanism of pathogenesis that relies on impaired protein degradation of the Ras GTPase RIT1.
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Vir: Osebne bibliografije
in: SICRIS
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