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Mathematical model identifies effective P53 accumulation with target gene binding affinity in DNA damage response for cell fate decision

机译:数学模型鉴定了在细胞命运决策的DNA损伤响应中对靶基因结合亲和力的有效P53积累

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Functional p53 signaling is essential for appropriate responses to diverse stimuli. P53 dynamics employs the information from the stimulus leading to selective gene expression and cell fate decision. However, the decoding mechanism of p53 dynamics under DNA damage challenge remains poorly understood. Here we mathematically modeled the recently dual-phase p53 dynamics under doxorubicin treatment. We found that p53 could perform sequential pulses followed by a high-amplitude terminal pulse at relatively low doxorubicin treatment, whereas p53 became steadily accumulated when damage level was high. The effective p53 integral above a threshold but not the absolute accumulation of p53 precisely discriminated survival and death. Silencing negative regulators in p53 network might promote the occurrence of terminal pulse. Furthermore, lower binding affinity and degradation rate of p53 target genes could favorably discriminate high and low dose doxorubicin treatment. Grouping by temporal profiles suggested that the p53 dynamics rather than the doxorubicin doses could better discriminate cellular outcomes and confer less variation for effective p53 integral reemphasizing the importance of p53 level regulation. Our model has established a theoretical framework that p53 dynamics can work cooperatively with its binding affinity to target genes leading to cell fate choice, providing new clues of optimized clinical design by manipulating p53 dynamics.
机译:功能P53信令对于对不同刺激的适当反应至关重要。 P53动态采用来自刺激的信息,导致选择性基因表达和细胞命运决定。然而,DNA损伤挑战下P53动力学的解码机制仍然是较差的理解。在这里,我们在数学上建模了在多柔比蛋白治疗下最近的双相P53动态。我们发现P53可以执行顺序脉冲,然后在相对低的多柔比蛋白处理中执行高幅度末端脉冲,而当损伤水平高时,P53变得稳定积累。有效的p53上方超过阈值,但不是P53的绝对积累精确地辨别的存活和死亡。 P53网络中的沉默负调节器可能会促进终端脉冲的发生。此外,P53靶基因的较低结合亲和力和降解速率可以有利地区分高低剂量的多柔比蛋白处理。按时间谱分组表明p53动态而不是多柔比蛋白剂量可以更好地区分蜂窝成果,并赋予有效P53积分的变化来克服P53级别监管的重要性。我们的模型建立了一个理论框架,P53动态可以与其对靶基因的结合亲和力合作,通过操纵P53动力学提供优化的临床设计的新线索。

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