Mutational profile of GNAQQ209 in human tumors.

Mutational profile of GNAQQ209 in human tumors.
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DOI:
10.1371/journal.pone.0006833
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发表时间:
2009-08-31
期刊:
影响因子:
3.7
通讯作者:
Bardelli A
Bardelli A
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Lamba S;Felicioni L;Buttitta F;Bleeker FE;Malatesta S;Corbo V;Scarpa A;Rodolfo M;Knowles M;Frattini M;Marchetti A;Bardelli A

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最近在83%的蓝痣、50%的恶性蓝痣和46%的葡萄膜黑色素瘤中发现了异源三聚体G蛋白α亚基(GNAQ)ras样结构域的频繁体细胞突变。这些突变只影响密码子209,并导致GNAQ组成型激活,而GNAQ又作为显性癌基因发挥作用。为了评估突变是否存在于其他肿瘤类型中,我们在一组922种肿瘤中进行了GNAQ外显子5的系统突变谱,包括胶质母细胞瘤、胃肠道间质瘤(GIST)、急性髓性白血病(AML)、蓝色痣、皮肤黑色素瘤、膀胱癌、乳腺癌、结直肠癌、肺癌、卵巢癌、胰腺癌和甲状腺癌。我们在6/13例(46%)蓝色痣中检测到先前报道的突变。在其他肿瘤中未发现影响Q209的变化。我们的数据表明,GNAQ突变的发生显示出一种独特的模式,存在于黑素细胞肿瘤的子集中,但在本研究中分析的胶质、上皮和基质来源的恶性肿瘤中不存在。
Frequent somatic mutations have recently been identified in the ras-like domain of the heterotrimeric G protein α-subunit (GNAQ) in blue naevi 83%, malignant blue naevi (50%) and ocular melanoma of the uvea (46%). The mutations exclusively affect codon 209 and result in GNAQ constitutive activation which, in turn, acts as a dominant oncogene. To assess if the mutations are present in other tumor types we performed a systematic mutational profile of the GNAQ exon 5 in a panel of 922 neoplasms, including glioblastoma, gastrointestinal stromal tumors (GIST), acute myeloid leukemia (AML), blue naevi, skin melanoma, bladder, breast, colorectal, lung, ovarian, pancreas, and thyroid carcinomas. We detected the previously reported mutations in 6/13 (46%) blue naevi. Changes affecting Q209 were not found in any of the other tumors. Our data indicate that the occurrence of GNAQ mutations display a unique pattern being present in a subset of melanocytic tumors but not in malignancies of glial, epithelial and stromal origin analyzed in this study.
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