一种检测小鼠转录因子活性的微阵列芯片的构建及应用
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国家高技术研究发展计划(863)(2006AA020701)资助项目.


Construction and Application of a Microarray for Profiling Mouse Transcription Factor Activities
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This work was supported by a grant from Hi-Tech Research and Development Program of China (006AA020701).

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    摘要:

    转录因子是一类具有序列特异性的双链DNA结合蛋白.在哺乳动物细胞中,一个转录因子可以调控多个靶基因,一个基因也同时受到多个转录因子的调控,从而形成复杂的基因表达网络调控机制.在蛋白质水平检测特定状态下组织或细胞中的转录因子活性对深入研究基因表达调控的分子机制具有重要的意义.针对TRANSFAC数据库提供的226个小鼠转录因子的PSSM,设计了240个转录因子结合探针,构建了可以在蛋白质水平同时检测约200个小鼠转录因子的微阵列芯片,实验结果显示:a.针对含有不同DNA结合结构域的7个转录因子,进行依赖于抗体的转录因子活性检测,结果证明该芯片具有良好的特异性;b.针对NFκB转录因子纯品,芯片的检测灵敏度可以达到0.5 nmol/L,线性范围为0.5~20 nmol/L,表明芯片具有较高的灵敏度和良好的定量能力;c.针对经典的IKK,JNK信号通路和JAK/STAT信号通路,该芯片可以检测到其关键转录因子的活性变化,证明芯片的可靠性;d.针对小鼠前脂肪细胞系3T3-L1的分化,该转录因子活性芯片不但检测到了已经报道的活性发生变化的转录因子,如PPAR家族和C/EBP家族外,还发现了以前没有报道过的SRF等,充分显示了芯片技术的高通量优势和发现新数据的能力.

    Abstract:

    Differential gene expression under particular conditions is tightly controlled at the transcriptional and post-transcriptional level. Transcription factors (TFs), key regulators at the transcriptional level, constitute a large and diverse group of double-strand DNA binding proteins which bind close to a target gene to activate or repress its transcription. Large-scale profiling of active transcription factors is essential to assist investigation into complicated gene regulatory networks as well as to help global pathway mapping. Here, a reproducible and reliable high-throughput mouse oligonucleotide array-based platform which can simultaneously explore the activities of nearly 200 different transcription factors is presented. The array comprises 240 synthetic probes which contain TF binding sequences based on 226 PSSMs provided by the TRANSFAC® database. The binding specificity between TF and its binding sequence was validated using antibody-based individual TF assay for AP1, HNF1, HNF4, NF1, NFκB, PPARγ and STAT1. Then purified NFκB was used to test the sensitivity and quantitative ability of the microarray. It could detect as little as 0.5 nmol/L of NFκB protein and maintain linear increase from 0.5 nmol/L to 20 nmol/L. Reproducibility was also explored using nuclear extracts from mouse macrophage RAW264.7 cells. The correlative coefficient between two independent experiments was 0.99 when using the identical nuclear protein. The reliability of the platform was then validated using two well studied cell models including LPS-stimulated MAPK pathway and IFNγ-stimulated JAK/STAT pathway. And finally, the TF profiling microarray was applied into the study of mouse preadipocyte 3T3-L1 differentiation. In addition to the well studied C/EBP family and PPAR family, two unknown transcription factors, SRF and NFAT, were also found changed in the process of adipocyte differentiation. Totally, a reliable microarray platform to profile the mouse transcription factor activities was successfully constructed.

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孙义民,曾令琴,张岩,魏丽,张亮,程京,K R MITCHELSON.一种检测小鼠转录因子活性的微阵列芯片的构建及应用[J].生物化学与生物物理进展,2009,36(2):244-253

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  • 收稿日期:2008-06-03
  • 最后修改日期:2008-07-04
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  • 在线发布日期: 2008-07-07
  • 出版日期: 2009-02-20