Human BLCAP transcript: new editing events in normal and cancerous tissues.

Human BLCAP transcript: new editing events in normal and cancerous tissues.
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DOI:
10.1002/ijc.25022
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发表时间:
2010-07-01
影响因子:
6.4
通讯作者:
Gallo, Angela
Gallo, Angela
中科院分区:
医学1区
文献类型:
--
作者:
Galeano, Federica;Leroy, Anne;Rossetti, Claudia;Gromova, Irina;Gautier, Philippe;Keegan, Liam P.;Massimi, Luca;Di Rocco, Concezio;O'Connell, Mary A.;Gallo, Angela

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膀胱癌相关蛋白(BLCAP)是物种间高度保守的蛋白质,被认为是从人类膀胱癌中发现的一个新的候选抑癌基因。然而,人们对这种蛋白质的调节或功能知之甚少。在这里,我们展示了人类BLCAP转录本经历了多个A到I编辑事件。一些新的编辑事件改变了蛋白质的高度保守的氨基末端,通过改变遗传编码的氨基酸来产生替代的蛋白质亚型。我们发现ADAR1和ADAR2编辑酶共同编辑这个转录本,不同的组织显示编辑和未编辑的BLCAP转录本的不同比例。此外,我们还观察到与相关正常组织相比,星形细胞瘤、膀胱癌和结直肠癌中BLCAP编辑水平普遍下降。新发现的编辑事件在癌症中下调,可能对未来的研究有用,作为区分不同肿瘤中的恶性肿瘤或表观遗传学变化的诊断工具。
Bladder cancer-associated protein (BLCAP) is a highly conserved protein among species, and it is considered a novel candidate tumor suppressor gene originally identified from human bladder carcinoma. However, little is known about the regulation or the function of this protein. Here, we show that the human BLCAP transcript undergoes multiple A-to-I editing events. Some of the new editing events alter the highly conserved amino terminus of the protein creating alternative protein isoforms by changing the genetically coded amino acids. We found that both ADAR1 and ADAR2-editing enzymes cooperate to edit this transcript and that different tissues displayed distinctive ratios of edited and unedited BLCAP transcripts. Moreover, we observed a general decrease in BLCAP-editing level in astrocytomas, bladder cancer and colorectal cancer when compared with the related normal tissues. The newly identified editing events, found to be downregulated in cancers, could be useful for future studies as a diagnostic tool to distinguish malignancies or epigenetic changes in different tumors.
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