Recurrent Copy Number Gain of Transcription Factor SOX2 and Corresponding High Protein Expression in Oral Squamous Cell Carcinoma

Recurrent Copy Number Gain of Transcription Factor SOX2 and Corresponding High Protein Expression in Oral Squamous Cell Carcinoma
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DOI:
10.1002/gcc.20714
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发表时间:
2010-01-01
影响因子:
3.7
通讯作者:
Radwirnmer, Bernhard
Radwirnmer, Bernhard
中科院分区:
医学2区
文献类型:
--
作者:
Freier, Koija;Knoepfle, Karl;Radwirnmer, Bernhard

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基因拷贝数畸变与口腔鳞状细胞癌(OSCC)的发展有关。为了描绘关键染色体区域内的候选基因,使用平均分辨率为 1 Mb 的覆盖整个人类基因组的微阵列将阵列 CGH 应用于 40 个 OSCC 样本。基因拷贝数增加主要见于1q23(9例)、3q26(11例)、5p15(13例)、7p11(7例)、8q24(17例)、11q13(15例)、14q32(8例)、19p13(8例)、19q12(7例)、19q13(8例)和20q13 (9),而在 3p21-3p12 (15)、8p32 (11)、10p12 (8) 和 18q21-q23 (10) 处检测到基因拷贝数丢失。随后通过定量实时聚合酶链式反应进行的 mRNA 表达分析发现,候选基因 SOX2 在 3q26.33、FSLT3 在 19p13.3 和 CCNE1 在 19q12 的 mRNA 高表达。对代表性 OSCC 收集的组织微阵列 (TMA) 分析发现,52% (115/223) 的肿瘤中 SOX2 的基因拷贝数增加,31% (72/233) 的肿瘤中 CCNE1 的基因拷贝数增加。对相应蛋白质的TMA切片的免疫组织化学分析检测到在所分析的肿瘤中18.1%(49/271)中SOX2高表达,以及23.3%(64/275)中CyclinE1高表达。这些发现表明 SOX2 和 CCNE1 可能通过基因拷贝数增加而被激活并参与口腔癌发生。阵列 CGH 与 TMA 分析相结合,可以快速查明新的有希望的候选基因,这些基因可以用作治疗分层标记或治疗干扰的靶分子。 (C) 2009 Wiley-Liss, Inc.
Gene copy number aberrations are involved in oral squamous cell carcinoma (OSCC) development. To delineate candidate genes inside critical chromosomal regions, array-CGH was applied to 40 OSCC specimens using a microarray covering the whole human genome with an average resolution of 1 Mb. Gene copy number gains were predominantly found at 1q23 (9 cases), 3q26 (11), 5p15 (13), 7p11 (7), 8q24 (17), 11q13 (15), 14q32 (8), 19p13 (8), 19q12 (7), 19q13 (8), and 20q13 (9), whereas gene copy number losses were detected at 3p21-3p12 (15), 8p32 (11), 10p12 (8), and 18q21-q23 (10). Subsequent mRNA expression analyses by quantitative real time polymerase chain reaction found high mRNA expression of candidate genes SOX2 in 3q26.33, FSLT3 in 19p13.3, and CCNE1 in 19q12. Tissue microarray (TMA) analyses in a representative OSCC collection found gene copy number gain for SOX2 in 52% (115/223) and for CCNE1 in 31% (72/233) of the tumors. Immunohistochemical analyses on TMA sections of the corresponding proteins detected high expression of SOX2 in 18.1% (49/271) and of CyclinEl in 23.3% (64/275) of tumors analyzed. These findings indicate that SOX2 and CCNE1 might be activated via gene copy number gain and participate in oral carcinogenesis. The combination of array-CGH with TMA analyses allows rapid pinpointing of novel promising candidate genes, which might be used as therapeutic stratification markers or target molecules for therapeutic interference. (C) 2009 Wiley-Liss, Inc.