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首页> 外文期刊>International Journal of Low Radiation >The effects of low dose ~(60)Co-gamma-radiation on radioresistance, mutagenesis, gene conversion, cell cycle and transcriptome profile in Saccharomyces cerevisiae
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The effects of low dose ~(60)Co-gamma-radiation on radioresistance, mutagenesis, gene conversion, cell cycle and transcriptome profile in Saccharomyces cerevisiae

机译:低剂量〜(60)Co-γ射线辐射对酿酒酵母抗辐射,诱变,基因转化,细胞周期和转录组谱的影响

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摘要

The underlying principles of low (stress)-dose Radiation-Induced Radioresistance (RIR) are inadequately understood. The present investigation focuses on understanding the genetic basis of RIR in Saccharomyces cerevisiae. In comparison with non-pre-irradiated cultures, the cultures that were pre-irradiated with a low dose of 60{sup left}Co y-radiation showed increased survivors (32%) but decreased convertants (26%) and revertants (65%) after irradiation with a lethal dose of 60{sup left}Co y-radiation. The radioresistance was higher if the stress dose was delivered at lower dose rate. The prolonged S-phase upregulation of genes from clusters of signal transduction, DNA damage repair, stress response, cell cycle and energy generation and down-regulation of genes from Unfolded Protein Response (UPR) pathways were observed in stress-dose irradiated cells when studied with the microarray technique. The post-irradiation variations in Heat Shock Proteins (HSPs) and the Mrell-Rad50-Xrs2 (MRX) complex were time-dependent and confirmed by real-time Quantitative-Polymerase Chain Reaction (Q-PCR) and Western blotting. This study suggests a combined role of HSPs and the MRX complex in RIR.
机译:低(应力)剂量辐射诱导的抗辐射性(RIR)的基本原理未被充分理解。本研究侧重于了解啤酒酵母中RIR的遗传基础。与未经预辐照的培养物相比,以60 {sup left} Co y辐照低剂量进行预辐照的培养物,存活率增加(32%),但转化体(26%)和回复体(65%)减少),并以60 {sup left} Co y致死剂量照射。如果以较低的剂量率递送应激剂量,则放射抗性较高。在研究应激剂量的细胞时,观察到信号转导,DNA损伤修复,应激反应,细胞周期和能量产生的簇基因的S期延长上调以及未折叠蛋白应答(UPR)途径的基因下调。用微阵列技术。辐射后热休克蛋白(HSPs)和Mrell-Rad50-Xrs2(MRX)复合物的变化是时间依赖性的,并通过实时定量聚合酶链反应(Q-PCR)和Western印迹得到证实。这项研究表明,HSP和MRX复合物在RIR中起着联合作用。

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