Identification of recurrent SMO and BRAF mutations in ameloblastomas.

Identification of recurrent SMO and BRAF mutations in ameloblastomas.
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DOI:
10.1038/ng.2986
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发表时间:
2014-07
期刊:
影响因子:
30.8
通讯作者:
West, Robert B.
West, Robert B.
中科院分区:
生物学1区
文献类型:
--
作者:
Sweeney, Robert T.;McClary, Andrew C.;Myers, Benjamin R.;Biscocho, Jewison;Neahring, Lila;Kwei, Kevin A.;Qu, Kunbin;Gong, Xue;Ng, Tony;Jones, Carol D.;Varma, Sushama;Odegaard, Justin I.;Sugiyama, Toshihiro;Koyota, Souichi;Rubin, Brian P.;Troxell, Megan L.;Pelham, Robert J.;Zehnder, James L.;Beachy, Philip A.;Pollack, Jonathan R.;West, Robert B.

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在这里,我们报告通过对档案资料的基因组分析,在80%以上的成釉细胞瘤(局部破坏性颌骨肿瘤)中发现了刺猬蛋白和丝裂原激活蛋白激酶(MAPK)途径的致癌突变。SMO基因(编码Smoothened, SMO)的突变在上颌骨成釉细胞瘤中很常见,而BRAF基因突变在下颌骨肿瘤中占主导地位。我们发现,编码p.Leu412Phe的频繁发生的SMO改变是一个激活突变,它对刺猬通路活性的影响可以被三氧化二砷(ATO)抑制,ATO是一种抗白血病药物,已被美国食品和药物管理局(FDA)批准,目前正处于其刺猬抑制活性的临床试验。以类似的方式,含有活化BRAF突变编码p.Val600Glu的成釉细胞瘤细胞对BRAF抑制剂vemurafenib敏感。我们的发现为成釉细胞瘤的诊断分类和治疗建立了一个新的范例。
Here we report the discovery of oncogenic mutations in the Hedgehog and mitogen-activated protein kinase (MAPK) pathways in over 80% of ameloblastomas, locally destructive odontogenic tumors of the jaw, by genomic analysis of archival material. Mutations in SMO (encoding Smoothened, SMO) are common in ameloblastomas of the maxilla, whereas BRAF mutations are predominant in tumors of the mandible. We show that a frequently occurring SMO alteration encoding p.Leu412Phe is an activating mutation and that its effect on Hedgehog-pathway activity can be inhibited by arsenic trioxide (ATO), an anti-leukemia drug approved by the US Food and Drug Administration (FDA) that is currently in clinical trials for its Hedgehog-inhibitory activity. In a similar manner, ameloblastoma cells harboring an activating BRAF mutation encoding p.Val600Glu are sensitive to the BRAF inhibitor vemurafenib. Our findings establish a new paradigm for the diagnostic classification and treatment of ameloblastomas.
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