title: Comparison of allelic discrimination by dHPLC, HRM, and TaqMan in the detection of BRAF mutation V600E.
abstract: The V600E mutation in the BRAF oncogene is associated with colorectal carcinomas, with mismatch-repair deficiency and, recently, with nonresponse to epidermal growth factor receptor inhibitor therapy. The use of reliable techniques for its detection is important. The aim of our study was to compare the performance characteristics in V600E detection of denaturing high-performance liquid chromatography (dHPLC) and high-resolution melting (HRM) with TaqMan allelic discrimination as well as direct-sequencing methods in a series of 195 colorectal paraffin-embedded specimens up to the age of 15 years. The effectiveness for obtaining results on mutation status was best using TaqMan (96.9%), followed by dHPLC (93.3%), HRM (88.7%), and sequencing (88.2%). In general, TaqMan was best for analyzing older tissues, whereas sequencing was the least efficient. Heterozygotic V600E was detected in 11.6%, 9.9%, 11.6%, and 9.9% of tissues using TaqMan, dHPLC, HRM, and sequencing, respectively. Result concordances between dHPLC and TaqMan or sequencing were excellent (κ = 0.9411 and κ = 0.8988, respectively); for HRM, the concordances were good (κ = 0.7973 and κ = 0.7488, respectively). By using DNA dilutions from tumor tissue, a minimum of 10% of V600E harboring cancer content was required for the analysis by dHPLC and HRM. dHPLC could detect four non-V600E mutations, whereas HRM detected one. Our results indicate that dHPLC and HRM are techniques that can be reliably used for the detection of the BRAFV600E mutation in archival paraffin-embedded tissues.
authors.affiliation: Biochemistry and Clinical Genetic Center, Virgen Arrixaca University Hospital, Murcia, Spain. pablo.conesa@carm.es
authors.forename: Pablo
authors.initials: P
authors.lastname: Carbonell
authors.forename: María C
authors.initials: MC
authors.lastname: Turpin
authors.forename: Daniel
authors.initials: D
authors.lastname: Torres-Moreno
authors.forename: Irene
authors.initials: I
authors.lastname: Molina-Martínez
authors.forename: José
authors.initials: J
authors.lastname: García-Solano
authors.forename: Miguel
authors.initials: M
authors.lastname: Perez-Guillermo
authors.forename: Pablo
authors.initials: P
authors.lastname: Conesa-Zamora
mesh_terms: D000483:Alleles; D019943:Amino Acid Substitution / Q000235:genetics*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004252:DNA Mutational Analysis / Q000379:methods*; D006579:Heterozygote; D006801:Humans; D009154:Mutation / Q000235:genetics*; D009691:Nucleic Acid Denaturation / Q000235:genetics*; D048493:Proto-Oncogene Proteins B-raf / Q000235:genetics*; D012680:Sensitivity and Specificity; D019914:Taq Polymerase / Q000378:metabolism
chemical_list: C482119:BRAF protein, human; D048493:Proto-Oncogene Proteins B-raf; D019914:Taq Polymerase