γ 辐照激活卵母细胞中的 TAp63α 后,促凋亡基因标志物增强。

Enhanced pro-apoptosis gene signature following the activation of TAp63α in oocytes upon γ irradiation.

机构信息

Institute of Molecular Biosciences, Goethe University, 60438, Frankfurt, Germany.

Institute of Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, Goethe University, 60438, Frankfurt, Germany.

出版信息

Cell Death Dis. 2022 Mar 4;13(3):204. doi: 10.1038/s41419-022-04659-2.

Abstract

Specialized surveillance mechanisms are essential to maintain the genetic integrity of germ cells, which are not only the source of all somatic cells but also of the germ cells of the next generation. DNA damage and chromosomal aberrations are, therefore, not only detrimental for the individual but affect the entire species. In oocytes, the surveillance of the structural integrity of the DNA is maintained by the p53 family member TAp63α. The TAp63α protein is highly expressed in a closed and inactive state and gets activated to the open conformation upon the detection of DNA damage, in particular DNA double-strand breaks. To understand the cellular response to DNA damage that leads to the TAp63α triggered oocyte death we have investigated the RNA transcriptome of oocytes following irradiation at different time points. The analysis shows enhanced expression of pro-apoptotic and typical p53 target genes such as CDKn1a or Mdm2, concomitant with the activation of TAp63α. While DNA repair genes are not upregulated, inflammation-related genes become transcribed when apoptosis is initiated by activation of STAT transcription factors. Furthermore, comparison with the transcriptional profile of the ΔNp63α isoform from other studies shows only a minimal overlap, suggesting distinct regulatory programs of different p63 isoforms.

摘要

专门的监测机制对于维持生殖细胞的遗传完整性至关重要,因为生殖细胞不仅是所有体细胞的来源,也是下一代生殖细胞的来源。因此,DNA 损伤和染色体异常不仅对个体有害,还会影响整个物种。在卵母细胞中,p53 家族成员 TAp63α 维持着 DNA 结构完整性的监测。TAp63α 蛋白在封闭和非活性状态下高度表达,并在检测到 DNA 损伤,特别是 DNA 双链断裂时,被激活为开放构象。为了了解导致 TAp63α 触发卵母细胞死亡的细胞对 DNA 损伤的反应,我们在不同时间点用辐照处理卵母细胞后,调查了卵母细胞的 RNA 转录组。分析表明,促凋亡和典型 p53 靶基因(如 CDKn1a 或 Mdm2)的表达增强,同时 TAp63α 被激活。虽然 DNA 修复基因没有上调,但当 STAT 转录因子激活引发细胞凋亡时,炎症相关基因开始转录。此外,与其他研究中 ΔNp63α 同工型的转录谱进行比较显示,只有最小的重叠,表明不同 p63 同工型有不同的调控程序。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/18b8/8897389/959a3c9990f3/41419_2022_4659_Fig1_HTML.jpg

文献AI研究员

20分钟写一篇综述,助力文献阅读效率提升50倍

立即体验

用中文搜PubMed

大模型驱动的PubMed中文搜索引擎

马上搜索