概括
细胞fps (c-fps) 基因序列单独不会转化纤维细胞. 然而,当与病毒基因序列融合时,c-fps获得了转化潜力,这表明瘤发生需要激活.
科学领域:
- 分子生物学分子生物学
- 瘤发生的发生因子.
- 复原病毒基因表达
背景情况:
- 已知病毒fps (v-fps) 序列可以转化纤维细胞.
- 细胞fps (c-fps) 基因产品的致癌潜力尚未完全理解.
- 逆转录病毒载体被用来研究基因功能和转变.
研究的目的:
- 为了研究细胞-fps (c-fps) 基因序列的转化潜力.
- 要确定c-fps是否需要激活以进行纤维细胞转化和瘤诱导.
- 为了比较单独c-fps与c-fps与病毒语序列融合的转换能力.
主要方法:
- 在逆转录病毒基因组中用c-fps序列替换病毒fps (v-fps).
- 使用病毒载体表达c-fps基因产物和gag-fps融合蛋白.
- 在实验模型中评估纤维细胞转化和瘤诱导.
主要成果:
- 单独对c-fps基因序列的高水平表达并没有诱导纤维细胞转化.
- 与基因序列相关的c-fps序列的表达导致纤维细胞转化.
- 当c-fps被表达为gag-fps融合蛋白时,观察到瘤诱导.
结论:
- c-fps基因产物缺乏内在的转化潜力,即使过度表达.
- 激活c-fps转换潜力可以通过fps编码区域内的突变发生.
- 与病毒基因序列的融合激活了c-fps基因的致癌潜力.
相关概念视频
Bacterial Transformation
In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Reporter Genes
Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
Commonly used reporter...
Commonly used reporter...
The Ras Gene
The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a superfamily...
Ras is a superfamily...
MAPK Signaling Cascades
Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
TGF - β Signaling Pathway
The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Transformation
Microbial communities are dynamic environments where cell lysis releases free DNA into the surroundings. Other cells can take up this extracellular DNA through a process known as transformation.When a cell incorporates this foreign DNA into its genome, resulting in genetic modification, the process is known as transformation. Cells capable of this process are termed competent. Competence can be natural, as observed in certain bacteria and archaea, or artificially induced in the...


