通过调节转录延长,TIF1gamma控制着红状腺细胞的命运
Xiaoying Bai1, Jonghwan Kim, Zhongan Yang
1Howard Hughes Medical Institute, Boston, MA 02115, USA.
Cell
|July 7, 2010
概括
转录延长调节了细胞命运. 丢失TIF1gamma导致RNA聚合酶II (Pol II) 暂停,但PAF或DSIF因子恢复红色素基因转录,揭示了细胞分化中的关键机制.
科学领域:
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
- 发展生物学 发展生物学
背景情况:
- 全基因组研究显示,RNA聚合酶II (Pol II) 在许多脊椎动物基因上暂停.
- 波兰II暂停可以阻碍基因转录,影响细胞过程.
研究的目的:
- 研究TIF1gamma在调节转录延长中的作用.
- 阐明TIF1gamma控制红色球蛋白基因转录的机制.
主要方法:
- 在斑马鱼 (tif1gamma突变月光) 的遗传研究.
- 蛋白质相互作用的生物化学分析 (TIF1gamma,SCL,p-TEFb,FACT).
- 染色体免疫沉降测定在人类CD34(+) 细胞中.
主要成果:
- 失去了与Pol II相关的PAF或DSIF因子,挽救了tif1gamma缺陷斑马鱼的红色素基因转录.
- 在TIF1gamma,SCL复合体,p-TEFb和FACT.之间建立了物理相互作用.
- TIF1gamma将积极的延长因子招募到红细胞基因中,抵消人类细胞中的Pol II暂停.
结论:
- 通过抵消Pol II暂停,TIF1gamma在促进转录延长方面发挥着至关重要的作用.
- 这种机制对于调节组织细胞命运和分化至关重要.
- 这些发现为控制发育过程中的基因表达建立了一条新的途径.
相关概念视频
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
Transcription Elongation Factors
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA into a...
General Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Transcription Factors
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
Master Transcription Regulators
Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

