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Role of the transcription factor T (brachyury) in the pathogenesis of sporadic chordoma: a genetic and functional‐based study
Author(s) -
Presneau Nadège,
Shalaby Asem,
Ye Hongtao,
Pillay Nischalan,
Halai Dina,
Idowu Bernadine,
Tirabosco Roberto,
Whitwell Duncan,
Jacques Thomas S,
Kindblom LarsGunnar,
Brüderlein Silke,
Möller Peter,
Leithner Andreas,
Liegl Bernadette,
Amary Fernanda M,
Athanasou Nicholas N,
Hogendoorn Pancras CW,
Mertens Fredrik,
Szuhai Karoly,
Flanagan Adrienne M
Publication year - 2011
Publication title -
the journal of pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.964
H-Index - 184
eISSN - 1096-9896
pISSN - 0022-3417
DOI - 10.1002/path.2816
Subject(s) - brachyury , polysomy , chordoma , biology , fluorescence in situ hybridization , cdkn2a , locus (genetics) , cancer research , pathology , microbiology and biotechnology , chromosome , genetics , gene , medicine , embryonic stem cell , mesoderm
A variety of analyses, including fluorescence in situ hybridization (FISH), quantitative PCR (qPCR) and array CGH (aCGH), have been performed on a series of chordomas from 181 patients. Twelve of 181 (7%) tumours displayed amplification of the T locus and an additional two cases showed focal amplification; 70/181 (39%) tumours were polysomic for chromosome 6, and 8/181 (4.5%) primary tumours showed a minor allelic gain of T as assessed by FISH. No germline alteration of the T locus was identified in non‐neoplastic tissue from 40 patients. Copy number gain of T was seen in a similar percentage of sacrococcygeal, mobile spine and base of skull tumours. Knockdown of T in the cell line, U‐CH1, which showed polysomy of chromosome 6 involving 6q27, resulted in a marked decrease in cell proliferation and morphological features consistent with a senescence‐like phenotype. The U‐CH1 cell line was validated as representing chordoma by the generation of xenografts, which showed typical chordoma morphology and immunohistochemistry in the NOD/SCID/interleukin 2 receptor [IL2r] $\gamma^{\rm{null}}$ mouse model. In conclusion, chromosomal aberrations resulting in gain of the T locus are common in sporadic chordomas and expression of this gene is critical for proliferation of chordoma cells in vitro . Copyright © 2010 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.