通过DDX3X抑制DDX3Y的各种机制
1Department of Biological Sciences, University of Delaware, Newark, DE 19716, USA.
bioRxiv : the preprint server for biology
|February 20, 2025
概括
在男性中,DDX3XRNA基酶的损失可以导致补偿DDX3Y上调. 这种交叉调节发生在mRNA或蛋白质水平上,取决于细胞类型,以维持DDX3剂量.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 细胞生物学 细胞生物学
背景情况:
- 死亡盒RNA螺旋酶DDX3X对于发育和疾病至关重要.
- 丢失DDX3X可以导致男性的补偿DDX3Y上调,这可能解释DDX3X相关疾病中的性二态.
- DDX3X-DDX3Y交叉调节的机制在很大程度上是未知的.
研究的目的:
- 在男性人类癌细胞系中研究DDX3X对DDX3Y的调节.
- 阐明DDX3X耗尽后DDX3Y上调的基础机制.
主要方法:
- 在HCT116和U87MG细胞系中DDX3X的耗尽.
- 对DDX3YmRNA和蛋白质水平的分析.
- 对转录和蛋白质稳定性的评估.
- 研究DDX3X和DDX3Y之间的物理相互作用.
- 位点定向突变发生,以评估蛋白质的稳定性.
主要成果:
- DDX3X 枯竭在HCT116细胞中适度增加了DDX3Y mRNA和蛋白质,部分是通过转录稳定.
- 在U87MG细胞中,DDX3X减少显著上调了DDX3Y蛋白,但不是mRNA,主要是通过增强蛋白质稳定性.
- 在物理上,DDX3X与DDX3Y相互作用.
- 与DDX3X相比,DDX3Y中的特定氨酸残留物导致其稳定性较低.
结论:
- 在DDX3X丢失后,通过转录或蛋白质稳定发生补偿DDX3Y上调,这取决于细胞类型.
- 在DDX3X和DDX3Y之间存在复杂的,特定于细胞类型的交叉调节,以保持总DDX3水平.
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