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2016 ; 6
(ä): 27454
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CRAF R391W is a melanoma driver oncogene
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Atefi M
; Titz B
; Tsoi J
; Avramis E
; Le A
; Ng C
; Lomova A
; Lassen A
; Friedman M
; Chmielowski B
; Ribas A
; Graeber TG
Sci Rep
2016[Jun]; 6
(ä): 27454
PMID27273450
show ga
Approximately 75% of melanomas have known driver oncogenic mutations in BRAF,
NRAS, GNA11 or GNAQ, while the mutations providing constitutive oncogenic
signaling in the remaining melanomas are not known. We established a melanoma
cell line from a tumor with none of the common driver mutations. This cell line
demonstrated a signaling profile similar to BRAF-mutants, but lacked sensitivity
to the BRAF inhibitor vemurafenib. RNA-seq mutation data implicated CRAF R391W as
the alternative driver mutation of this melanoma. CRAF R391W was homozygous and
over expressed. These melanoma cells were highly sensitive to CRAF, but not BRAF
knockdown. In reconstitution experiments, CRAF R391W, but not CRAF WT,
transformed NIH3T3 cells in soft-agar colony formation assays, increased kinase
activity in vitro, induced MAP kinase signaling and conferred vemurafenib
resistance. MAP kinase inducing activity was dependent on CRAF dimerization.
Thus, CRAF is a bona fide alternative oncogene for BRAF/NRAS/GNAQ/GNA11 wild type
melanomas.