Recurrent EZH1 mutations are a second hit in autonomous thyroid adenomas
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Recurrent EZH1 mutations are a second hit in autonomous thyroid adenomas. / Calebiro, Davide; Grassi, Elisa S.; Eszlinger, Markus; Ronchi, Cristina L.; Godbole, Amod; Bathon, Kerstin; Guizzardi, Fabiana; De Filippis, Tiziana; Krohn, Knut; Jaeschke, Holger; Schwarzmayr, Thomas; Bircan, Rifat; Gozu, Hulya Iliksu; Sancak, Seda; Niedziela, Marek; Strom, Tim M.; Fassnacht, Martin; Persani, Luca; Paschke, Ralf.
In: Journal of Clinical Investigation, Vol. 126, No. 9, 01.09.2016, p. 3383-3388.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Recurrent EZH1 mutations are a second hit in autonomous thyroid adenomas
AU - Calebiro, Davide
AU - Grassi, Elisa S.
AU - Eszlinger, Markus
AU - Ronchi, Cristina L.
AU - Godbole, Amod
AU - Bathon, Kerstin
AU - Guizzardi, Fabiana
AU - De Filippis, Tiziana
AU - Krohn, Knut
AU - Jaeschke, Holger
AU - Schwarzmayr, Thomas
AU - Bircan, Rifat
AU - Gozu, Hulya Iliksu
AU - Sancak, Seda
AU - Niedziela, Marek
AU - Strom, Tim M.
AU - Fassnacht, Martin
AU - Persani, Luca
AU - Paschke, Ralf
PY - 2016/9/1
Y1 - 2016/9/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84987792301&partnerID=8YFLogxK
U2 - 10.1172/JCI84894
DO - 10.1172/JCI84894
M3 - Article
AN - SCOPUS:84987792301
VL - 126
SP - 3383
EP - 3388
JO - Journal of Clinical Investigation
JF - Journal of Clinical Investigation
SN - 0021-9738
IS - 9
ER -