由R环衍生的细胞质RNA-DNA混合体激活免疫反应
在PubMed上查看摘要
概括
此摘要是机器生成的。R环,RNA-DNA混合体,当错误处理并积聚在细胞质中时,可以触发天生的免疫反应. 这种异常积累导致细胞死亡, 可能导致癌症和神经退化等疾病.
科学领域
- 分子生物学
- 遗传学
- 免疫学
背景情况
- R环是细胞过程中关键的核酸结构.
- R环动态的调节不良与DNA损伤和基因组不稳定性有关.
- 像XPG这样的内核酶在R循环处理中的作用及其后果尚不清楚.
研究的目的
- 识别和描述细胞质RNA-DNA混合体的新型种群.
- 阐明R循环处理的机制和细胞质混合体的形成.
- 研究异常R循环处理的细胞后果,包括免疫激活和细胞死亡.
主要方法
- 通过耗尽参毒素 (SETX) 或BRCA1来破坏核R循环.
- 细胞质RNA-DNA混合物的鉴定.
- 评估混合体与模式识别受体 (cGAS,TLR3) 的结合.
- 监测IRF3激活和亡的诱导.
- 对患有SETX或BRCA1突变的患者细胞进行分析.
主要成果
- 一个新的细胞质RNA-DNA混合体群被确定为R循环处理产物.
- 细胞质混合体的形成依赖于XPG和XPF.
- 这些混合物来自特定的核R循环.
- 细胞质杂交物通过cGAS和TLR3激活先天免疫反应,导致IRF3激活和亡.
- 观察R循环处理和免疫激活的细胞来自缩和BRCA1突变的癌细胞.
结论
- 当RNA-DNA混合物在细胞质中异常处理和积累时,它们可以具有免疫性.
- 通过先天免疫激活,R循环处理有助于细胞死亡.
- 异常的R循环处理和免疫激活可能在神经退行和癌症中起作用.
相关概念视频
RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
In the cytoplasm, siRNA is processed from a double-stranded RNA, which comes from either endogenous DNA transcription or exogenous sources like a virus. This double-stranded RNA is then cleaved by the...
RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
This process occurs naturally in cells, often through the activity of genomically-encoded microRNAs. Researchers can take advantage of this mechanism by introducing synthetic RNAs to deactivate specific genes for research or therapeutic purposes. For example, RNAi could be used...
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

