The oncogenic transcription factor FOXM1 and anticancer therapy

Comment on: Halasi M,et al. PLoS One 2012; 7:e31761.     

细菌功能调控的重要转录因子PerR

PerR是一类存在于多种细菌中的转录因子。研究证实PerR调控的靶基因包括过氧化氢酶katA、DNA结合蛋白mrgA、铁转运调控子fur、血红素合成基因簇hemAXCDBL以及自身perR等。PerR参与的调控作用在细菌的抗氧化作用、胞内的铁离子动态平衡、以及致病菌致病作用中具有重要的意义。本综述主要从PerR调控的靶基因、参与的生理代谢作用以及PerR转录调控的分子机制等方面进行介绍,以期对我们深入了解细菌的抗逆作用机制提供参考。     

Modulation of chromatin by MARs and MAR binding oncogenic transcription factor SMAR1

The orchestration of the events in the cell during the progression of the cell cycle is modulated by various phenomenon which are regulated by structural modules of the cell. The nucleus is a major hub for all these regulatory units which harbour the nuclear matrix, matrix proteins and chromatin. The histone modifications etch a complex code on the chromatin and the matrix proteins in consort with the histone code regulate the gene expression. SMAR1 is a matrix attachment region binding protein that interacts with chromatin modulators like HDAC1, Sin3A and causes chromatin condensation. SMAR1 modulates the chromatin at the Vβ locus and plays a prominent role in V(D)J recombination. Such indispensable function of SMAR1 by the modulation of chromatin in the context of malignancy and V(D)J recombination emphasizes that MAR binding proteins regulate the complex events of the cell and perturbed expression causes disease conditions.     

c-Myc功能及其下游靶点

c-Myc是一个在进化上较为保守的,具有b/HLH/LZ结构的转录调节因子,它可以与Max形成异源二聚体通过结合于启动子区的E盒结构对基因进行转录激活调控,也可以通过其他方式对基因进行正负调节,参与调控了细胞的增殖、分化、生长、凋亡、细胞周期进程、细胞内生物大分子的代谢以及细胞的恶性转化。近期,研究者通过采用微阵列芯片、生物信息学技术、染色质免疫沉淀(ChIP)、基因表达系列分析(SAGE)等高通量研究的新技术对c-Myc下游靶点进行研究,这对于揭示c-Myc结构与功能之间的关系具有重要的生物学意义。