Frequency and Spectrum of BRAF Mutations in a Retrospective, Single-Institution Study of 1112 Cases of Melanoma Wesley O. Greaves, Shalini Verma, Keyur.

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Frequency and Spectrum of BRAF Mutations in a Retrospective, Single-Institution Study of 1112 Cases of Melanoma Wesley O. Greaves, Shalini Verma, Keyur P. Patel, Michael A. Davies, Bedia A. Barkoh, John M. Galbincea, Hui Yao, Alexander J. Lazar, Kenneth D. Aldape, L. Jeffrey Medeiros, Rajyalakshmi Luthra The Journal of Molecular Diagnostics Volume 15, Issue 2, Pages 220-226 (March 2013) DOI: 10.1016/j.jmoldx.2012.10.002 Copyright © 2013 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions

Figure 1 Detection of BRAF c.1798_1799delinsAA (p.V600K) by single-base primer extension MALDI-TOF MS. A two-primer strategy was used to detect the variant nucleotides in the first and second base positions of codon 600. A and C: Single peaks representing the WT nucleotides at the first and second positions of codon 600, G and T, respectively (black arrows). B and D: Heterozygous variant peaks (white arrows) representing an indel (GT>AA) involving positions 1 and 2 of BRAF codon 600, resulting in a p.V600K change. The Journal of Molecular Diagnostics 2013 15, 220-226DOI: (10.1016/j.jmoldx.2012.10.002) Copyright © 2013 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions

Figure 2 Detection of BRAF c.1799_1800delinsAA (the so-called p.V600E2) in melanoma by pyrosequencing and Sanger sequencing. A: Pyrosequencing tracing shows the WT BRAF codon 600 as GTG. B: In mutant BRAF codon 600, a prominent peak represents A after the first G (white arrow), and a reduced peak represents the third base G (black arrow). C: The precise variant sequence (GAA) is confirmed by Sanger sequencing, which demonstrates a heterozygous pattern of T/A G/A at the second and third base positions of codon 600 (arrows). The Journal of Molecular Diagnostics 2013 15, 220-226DOI: (10.1016/j.jmoldx.2012.10.002) Copyright © 2013 American Society for Investigative Pathology and the Association for Molecular Pathology Terms and Conditions