Identification of a rare 3 bp BRAF gene deletion in a thyroid nodule by mutant enrichment with 3'-modified oligonucleotides polymerase chain reaction.

Annals of Laboratory Medicine
Mi-Ae JangJong-Won Kim

Abstract

Papillary thyroid carcinoma (PTC) is the most common malignant thyroid tumor, and 36-69% of PTC cases are caused by mutations in the BRAF gene. The substitution of a valine for a glutamic acid (V600E) comprises up to 95-100% of BRAF mutations; therefore, most diagnostic methods, including allele-specific PCR and real-time PCR, are designed to detect this mutation. Nevertheless, other mutations can also comprise the genetic background of PTC. Recently, a novel and sensitive technique called mutant enrichment with 3'-modified oligonucleotides (MEMO) PCR has been introduced. When we applied allelespecific PCR and MEMO-PCR for the detection of the BRAF V600E mutation, we found an unusual 3' bp deletion mutation (c.1799_1801delTGA) only when using MEMO-PCR. This deletion results in the introduction of a glutamic acid into the B-Raf activation segment (p.V600_K601delinsE), leading to an elevated basal kinase activity of BRAF. This is the first report of a rare 3 bp BRAF deletion in a PTC patient that could not be detected by allele-specific PCR.

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Citations

Feb 26, 2016·Archives of Pathology & Laboratory Medicine·Ryan J GertzRicardo V Lloyd
Aug 15, 2014·Journal of Korean Medical Science·Uiju ChoChan Kwon Jung
Oct 9, 2018·Clinical Otolaryngology : Official Journal of ENT-UK ; Official Journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery·Xueying GohChwee Ming Lim
Apr 16, 2020·Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc·David SusterSaul Suster
Mar 23, 2019·Pathology Oncology Research : POR·Seo Young SohnJae Hyuk Lee

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Methods Mentioned

BETA
PCR
biopsy

Software Mentioned

MEMO
Sequencher

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