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Calebiro, D.* ; Grassi, E.S.* ; Eszlinger, M.* ; Ronchi, C.L.* ; Godbole, A.* ; Bathon, K.* ; Guizzardi, F.* ; de Filippis, T.* ; Krohn, K.* ; Jaeschke, H.* ; Schwarzmayr, T. ; Bircan, R.* ; Gozu, H.I.* ; Sancak, S.* ; Niedziela, M.* ; Strom, T.M. ; Fassnacht, M.* ; Persani, L.* ; Paschke, R.*

Recurrent EZH1 mutations are a second hit in autonomous thyroid adenomas.

J. Clin. Invest. 126, 3383-3388 (2016)
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Autonomous thyroid adenomas (ATAs) are a frequent cause of hyperthyroidism. Mutations in the genes encoding the TSH receptor (TSHR) or the Gs protein α subunit (GNAS) are found in approximately 70% of ATAs. The involvement of other genes and the pathogenesis of the remaining cases are presently unknown. Here, we performed whole-exome sequencing in 19 ATAs that were paired with normal DNA samples and identified a recurrent hot-spot mutation (c.1712A>G; p.Gln571Arg) in the enhancer of zeste homolog 1 (EZH1) gene, which codes for a catalytic subunit of the polycomb complex. Targeted screening in an independent cohort confirmed that this mutation occurs with high frequency (27%) in ATAs. EZH1 mutations were strongly associated with known (TSHR, GNAS) or presumed (adenylate cyclase 9 [ADCY9]) alterations in cAMP pathway genes. Furthermore, functional studies revealed that the p.Gln571Arg EZH1 mutation caused increased histone H3 trimethylation and increased proliferation of thyroid cells. In summary, this study revealed that a hot-spot mutation in EZH1 is the second most frequent genetic alteration in ATAs. The association between EZH1 and TSHR mutations suggests a 2-hit model for the pathogenesis of these tumors, whereby constitutive activation of the cAMP pathway and EZH1 mutations cooperate to induce the hyperproliferation of thyroid cells.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Somatic Mutations; Constitutive Activation; Germline Mutation; Hyperthyroidism
ISSN (print) / ISBN 0021-9738
e-ISSN 1558-8238
Quellenangaben Volume: 126, Issue: 9, Pages: 3383-3388 Article Number: , Supplement: ,
Publisher American Society of Clinical Investigation
Publishing Place Ann Arbor
Reviewing status