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Characterization of a novel complex BRAF mutation in a follicular variant papillary thyroid carcinoma.

Abstract：

INTRODUCTION:Activating mutations of the BRAF oncogene are frequently detected in papillary thyroid carcinoma (PTC) and have been associated with a worse prognosis. The amino acid substitution V600E accounts for 90% of all oncogenic BRAF mutations and is typically detected in classic PTCs, whereas other less frequent BRAF mutations seem to be associated with other PTC histotypes. CASE:Screening for activating BRAF mutations in a series of 83 PTCs identified the most common V600E mutation in 39 cases (histologically, 38 classic PTCs and 1 sclerosing variant PTC) and a complex in-frame mutation involving amino acids V600-S605 in a stage III multicentric follicular variant PTC, occurring in a 50-year-old female patient, who was affected by hypothyroidism in autoimmune thyroiditis and had a family history of PTC and autoimmune thyroiditis. Since the identified BRAF mutation was novel in the literature, bioinformatic modeling was performed to predict its impact on BRAF activity. Although the mutation resulted in loss of a phosphorylation site in the activation loop of BRAF, it was predicted to increase BRAF kinase activity by mimicking an activating phosphorylation. CONCLUSIONS:This study, which reports a new BRAF mutation, highlights the usefulness of bioinformatic modeling in the prediction of functional effects of new mutations and indicates that mutation-specific screening tests might miss some rare BRAF mutations. These facts should be taken into consideration in the molecular diagnosis of thyroid cancer and in the design of therapeutic protocols based on inhibitors of the BRAF pathway.

journal_name

Eur J Endocrinol

journal_title

European journal of endocrinology

authors

Barzon L,Masi G,Boschin IM,Lavezzo E,Pacenti M,Casal Ide E,Toniato A,Toppo S,Palù G,Pelizzo MR

doi

10.1530/EJE-08-0239

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

77-80

issue

1

eissn

0804-4643

issn

1479-683X

pii

EJE-08-0239

journal_volume

159

pub_type

杂志文章

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