Mutant SF3B1 promotes AKT- and NF-κB–driven mammary tumorigenesis

Mutations in the core RNA splicing factor SF3B1 are prevalent in leukemias and uveal melanoma, but hotspot SF3B1 mutations are also seen in epithelial malignancies such as breast cancer. Although hotspot mutations in SF3B1 alter hematopoietic differentiation, whether SF3B1 mutations contribute to ep...

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Veröffentlicht in:	The Journal of clinical investigation Jg. 131; H. 1
Hauptverfasser:	Liu, Bo, Liu, Zhaoqi, Chen, Sisi, Ki, Michelle, Erickson, Caroline, Reis-Filho, Jorge S., Durham, Benjamin H., Chang, Qing, de Stanchina, Elisa, Sun, Yiwei, Rabadan, Raul, Abdel-Wahab, Omar, Chandarlapaty, Sarat
Format:	Journal Article
Sprache:	Englisch
Veröffentlicht:	United States American Society for Clinical Investigation 04.01.2021
Schlagworte:	Animals Breast Neoplasms - genetics Breast Neoplasms - metabolism Breast Neoplasms - pathology Carcinogenesis - genetics Carcinogenesis - metabolism Carcinogenesis - pathology Female Humans Mammary Neoplasms, Animal - genetics Mammary Neoplasms, Animal - metabolism Mammary Neoplasms, Animal - pathology Mice Mice, Transgenic Mutation NF-kappa B - genetics NF-kappa B - metabolism Phosphoproteins - genetics Phosphoproteins - metabolism Proto-Oncogene Proteins c-akt - genetics Proto-Oncogene Proteins c-akt - metabolism RNA Splicing Factors - genetics RNA Splicing Factors - metabolism RNA processing Oncology Breast cancer
ISSN:	0021-9738, 1558-8238, 1558-8238
Online-Zugang:	Volltext
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Zusammenfassung:	Mutations in the core RNA splicing factor SF3B1 are prevalent in leukemias and uveal melanoma, but hotspot SF3B1 mutations are also seen in epithelial malignancies such as breast cancer. Although hotspot mutations in SF3B1 alter hematopoietic differentiation, whether SF3B1 mutations contribute to epithelial cancer development and progression is unknown. Here, we identify that SF3B1 mutations in mammary epithelial and breast cancer cells induce a recurrent pattern of aberrant splicing leading to activation of AKT and NF-κB, enhanced cell migration, and accelerated tumorigenesis. Transcriptomic analysis of human cancer specimens, MMTV-cre Sf3b1K700E/WT mice, and isogenic mutant cell lines identified hundreds of aberrant 3' splice sites (3'ss) induced by mutant SF3B1. Consistently between mouse and human tumors, mutant SF3B1 promoted aberrant splicing (dependent on aberrant branchpoints as well as pyrimidines downstream of the cryptic 3'ss) and consequent suppression of PPP2R5A and MAP3K7, critical negative regulators of AKT and NF-κB. Coordinate activation of NF-κB and AKT signaling was observed in the knockin models, leading to accelerated cell migration and tumor development in combination with mutant PIK3CA but also hypersensitizing cells to AKT kinase inhibitors. These data identify hotspot mutations in SF3B1 as an important contributor to breast tumorigenesis and reveal unique vulnerabilities in cancers harboring them.
Bibliographie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Authorship note: BL and ZL contributed equally to this work.
ISSN:	0021-9738 1558-8238 1558-8238
DOI:	10.1172/JCI138315