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|Ref Type||Journal Article|
|Authors||Mologni L, Costanza M, Sharma GG, Viltadi M, Massimino L, Citterio S, Purgante S, Raman H, Pirola A, Zucchetti M, Piazza R, Gambacorti-Passerini C|
|Title||Concomitant BCORL1 and BRAF Mutations in Vemurafenib-Resistant Melanoma Cells.|
|Journal||Neoplasia (New York, N.Y.)|
|Abstract Text||BRAF is the most frequently mutated gene in melanoma. Constitutive activation of mutant BRAFV600E leads to aberrant Ras-independent MAPK signaling and cell transformation. Inhibition of mutant BRAF is a current frontline therapy for such cases, with improved survival compared with chemotherapy. Unfortunately, reactivation of MAPK signaling by several mechanisms has been shown to cause drug resistance and disease recurrence. In this work, we describe the co-occurrence of an in-frame deletion within an amplified BRAFV600E locus and a missense point mutation of the transcriptional repressor BCORL1 in vemurafenib-resistant A375 melanoma cells. Functional data confirmed that truncated p47BRAFV600E and mutant BCORL1Q1076H both contribute to resistance. Interestingly, either endogenous BCORL1 silencing or ectopic BCORL1Q1076H expression mimicked the effects of a CRISPR/Cas9-edited BCORL1Q1076H locus, suggesting a complex mixture of loss- and gain-of-function effects caused by the mutation. Transcriptomic data confirmed this hypothesis. Finally, we show that the pan-RAF inhibitor sorafenib is not affected by expression of BRAF deletion variant and effectively synergizes with vemurafenib to block resistant cells, suggesting a possible intervention for this class of mutants.|
|Molecular Profile||Treatment Approach|
|Gene Name||Source||Synonyms||Protein Domains||Gene Description||Gene Role|
|Therapy Name||Drugs||Efficacy Evidence||Clinical Trials|
|Drug Name||Trade Name||Synonyms||Drug Classes||Drug Description|
|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
|Molecular Profile||Indication/Tumor Type||Response Type||Therapy Name||Approval Status||Evidence Type||Efficacy Evidence||References|
|BRAF V47_D380del BRAF V600E||melanoma||resistant||Vemurafenib||Preclinical - Cell culture||Actionable||In a preclinical study, expression of BRAF V47_D380del in a melanoma cell line harboring BRAF V600E conferred resistance to Zelboraf (vemurafenib) in culture (PMID: 29605720).||29605720|