PTEN C-terminal deletion causes genomic instability and tumor development.

PTEN C-terminal deletion causes genomic instability and tumor development.
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DOI:
10.1016/j.celrep.2014.01.030
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发表时间:
2014-03-13
期刊:
影响因子:
8.8
通讯作者:
Yin Y
Yin Y
中科院分区:
生物学1区
文献类型:
--
作者:
Sun Z;Huang C;He J;Lamb KL;Kang X;Gu T;Shen WH;Yin Y

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抑癌基因PTEN控制基因组的稳定性,抑制肿瘤的发生。PTEN的N端磷酸酶结构域可拮抗PI3K/AKT途径,但其C端功能尚不明确。在这里,我们描述了一个无义突变导致整个Pten C-末端区域缺失的敲入小鼠模型,称为PtenΔC。PtenΔC杂合子小鼠会发展成多种自发性肿瘤,包括癌症和B细胞淋巴瘤。Pten C-末端结构域的杂合性缺失也会导致基因组不稳定和常见的脆性位点重排。我们发现,Pten C末端的破坏诱导了P53及其下游靶点的形成。同时缺失P53可促进肿瘤的转移,但不影响肿瘤的发生,提示P53主要抑制肿瘤的进展。我们的数据强调了PTEN C末端在维持基因组稳定性和抑制肿瘤发生中的重要作用。
Tumor suppressor PTEN controls genomic stability and inhibits tumorigenesis. The N-terminal phosphatase domain of PTEN antagonizes the PI3K/AKT pathway, but its C-terminal function is less defined. Here we describe a knock-in mouse model of a nonsense mutation that results in deletion of the entire Pten C-terminal region, referred to as PtenΔC. Mice heterozygous for PtenΔC develop multiple spontaneous tumors, including cancers and B cell lymphoma. Heterozygous deletion of the Pten C-terminal domain also causes genomic instability and common fragile site rearrangement. We found that Pten C terminal disruption induces p53 and its downstream targets. Simultaneous depletion of p53 promotes metastasis without influencing initiation of tumors, suggesting that p53 mainly suppresses tumor progression. Our data highlight the essential role of the PTEN C-terminus in the maintenance of genomic stability and suppression of tumorigenesis.
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