Recurrent hemizygous deletions in cancers may optimize proliferative potential.

Recurrent hemizygous deletions in cancers may optimize proliferative potential.
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DOI:
10.1126/science.1219580
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发表时间:
2012-07-06
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Elledge SJ
Elledge SJ
中科院分区:
其他
文献类型:
--
作者:
Solimini NL;Xu Q;Mermel CH;Liang AC;Schlabach MR;Luo J;Burrows AE;Anselmo AN;Bredemeyer AL;Li MZ;Beroukhim R;Meyerson M;Elledge SJ

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肿瘤表现出许多复发的半合子局灶性缺失,其中不含已知的肿瘤抑制因子,对其了解甚少。为了研究这些区域是否有助于肿瘤发生,我们在这些半合子缺失中寻找具有癌症相关特性的基因。我们发现了STOP和GO基因,它们分别负向和正向调节增殖。停止基因包括许多已知的肿瘤抑制基因,而氧化石墨烯基因则富含必需基因。对其染色体分布的分析显示,重复缺失优先代表STOP基因,而低于代表GO基因。我们提出了一种假设,称为癌症基因岛模型,其中包含高密度STOP基因和低密度GO基因的基因岛被半合子删除,通过累积单倍性不足来最大化增殖适应性。因为每个肿瘤都有成百上千个基因被半合子删除,这种机制可能有助于驱动许多癌症类型的肿瘤发生。
Tumors exhibit numerous recurrent hemizygous focal deletions that contain no known tumor suppressors and are poorly understood. To investigate whether these regions contribute to tumorigenesis, we searched genetically for genes with cancer-relevant properties within these hemizygous deletions. We identified STOP and GO genes, which negatively and positively regulate proliferation, respectively. STOP genes include many known tumor suppressors, whereas GO genes are enriched for essential genes. Analysis of their chromosomal distribution revealed that recurring deletions preferentially over represent STOP genes and under represent GO genes. We propose a hypothesis called the cancer gene island model whereby gene islands encompassing high densities of STOP genes and low densities of GO genes are hemizygously deleted to maximize proliferative fitness through cumulative haploinsufficiencies. Because hundreds to thousands of genes are hemizygously deleted per tumor, this mechanism may help drive tumorigenesis across many cancer types.
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