p53 null fluorescent yellow direct repeat (FYDR) mice have normal levels of homologous recombination.

p53 null fluorescent yellow direct repeat (FYDR) mice have normal levels of homologous recombination.
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DOI:
10.1016/j.dnarep.2011.09.009
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发表时间:
2011-12-10
期刊:
影响因子:
3.8
通讯作者:
Engelward BP
Engelward BP
中科院分区:
医学3区
文献类型:
--
作者:
Wiktor-Brown DM;Sukup-Jackson MR;Fakhraldeen SA;Hendricks CA;Engelward BP

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肿瘤抑制因子 p53 是一种转录因子,其功能对于维持哺乳动物细胞基因组稳定性至关重要。为了响应 DNA 损伤,p53 启动信号级联,导致细胞周期停滞、DNA 修复,或者,如果损伤严重,则导致程序性细胞死亡。此外,p53 与参与同源重组的修复蛋白相互作用。有丝分裂同源重组(HR)在双链断裂(DSB)和断裂复制叉的修复中发挥着重要作用。 p53 或 HR 功能丧失会导致癌症风险增加。鉴于 p53 和 HR 在维持基因组完整性方面的重要性,我们使用荧光黄直接重复序列 (FYDR) 小鼠以及姐妹染色单体交换 (SCE) 测定分析了 p53 对 HR 的体内影响。 FYDR 小鼠携带直接重复底物,其中 HR 事件可以产生荧光表型。在这里,我们表明,当使用 FYDR 底物和 SCE 进行评估时,p53 状态不会显着影响体内成人胰腺细胞或体外原代成纤维细胞的自发 HR。此外,当用丝裂霉素 C 攻击时,来自 p53 缺失小鼠的原代成纤维细胞并未表现出对 DNA 损伤诱导的 HR 的敏感性增加。总之,FYDR 直接重复测定和 SCE 分析表明,对于某些组织和细胞类型,p53 状态不会对 HR 产生很大影响。
The tumor suppressor p53 is a transcription factor whose function is critical for maintaining genomic stability in mammalian cells. In response to DNA damage, p53 initiates a signaling cascade that results in cell cycle arrest, DNA repair or, if the damage is severe, programmed cell death. In addition, p53 interacts with repair proteins involved in homologous recombination. Mitotic homologous recombination (HR) plays an essential role in the repair of double-strand breaks (DSBs) and broken replication forks. Loss of function of either p53 or HR leads to an increased risk of cancer. Given the importance of both p53 and HR in maintaining genomic integrity, we analyzed the effect of p53 on HR in vivo using Fluorescent Yellow Direct Repeat (FYDR) mice as well as with the sister chromatid exchange (SCE) assay. FYDR mice carry a direct repeat substrate in which an HR event can yield a fluorescent phenotype. Here, we show that p53 status does not significantly affect spontaneous HR in adult pancreatic cells in vivo or in primary fibroblasts in vitro when assessed using the FYDR substrate and SCEs. In addition, primary fibroblasts from p53 null mice do not show increased susceptibility to DNA damage-induced HR when challenged with mitomycin C. Taken together, the FYDR direct repeat assay and SCE analysis indicate that, for some tissues and cell types, p53 status does not greatly impact HR.
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