概括
干扰素治疗在神经母细胞细胞中诱导特定的信使RNA (mRNA),一些基因表现出增加的转录和稳定的mRNA积累. 转录后调节也会导致mRNA水平升高.
科学领域:
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
- 神经科学是一个神经科学.
背景情况:
- 干扰素是免疫系统中至关重要的信号分子.
- 了解干扰素对基因调节的理解是它们治疗应用的关键.
- 神经母细胞瘤细胞为研究细胞对干扰素反应提供了一个模型.
研究的目的:
- 在T98G神经母细胞瘤细胞中识别和表征干扰素诱导的基因.
- 研究这些诱导基因的转录和后转录调节.
- 了解mRNA积累和基因表达变化的动力学.
主要方法:
- 从干扰素治疗的细胞中克隆补充DNA (cDNA).
- 北方斑点分析检测mRNA水平.
- 随着时间的推移对基因转录率的分析.
主要成果:
- 鉴定出了18个cDNA,对应于7种不同的干扰素诱导mRNA.
- 一个诱导的mRNA编码为metallothionein II,另一个为I类HLA.
- 干扰素的mRNA积累持续了1天,但在干扰素被移除后停止了;诱导的mRNA是稳定的.
- 基因转录在5分钟内翻了一番,并在60分钟达到顶峰,然后下降,而mRNA水平继续上升,表明转录后调节.
结论:
- 干扰素诱导神经母细胞瘤细胞中特定基因的表达,包括已知的和新的细胞.
- 转录激活和后转录机制都会促进干扰素诱导的mRNAs的持续积累.
- 诱导的mRNAs的稳定性和复杂的调节突出显示了细胞对干扰素的复杂反应.
相关概念视频
What is Gene Expression?
Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
What is Gene Expression?
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then processed and...
Regulation of Expression Occurs at Multiple Steps
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...
Inhibitors of Viral Protein Synthesis
Protein synthesis is indispensable for viral replication, as viruses lack the cellular machinery required for this process and must hijack the host's translational apparatus. In response, host cells deploy a critical innate immune defense involving interferons, specialized cytokines that play a central role in inhibiting viral propagation.Upon viral detection, infected cells release interferons that bind to receptors on adjacent uninfected cells, activating the JAK-STAT signaling pathway and...


