The differential gene expression is the molecular base of development and responses to stimuli of organisms. Transcription factors (TFs) play important regulatory roles in this kind of differential gene expression. Therefore, to elucidate how these TFs regulate the complex differential gene expression, it is necessary to identify all target genes of them and construct the gene transcription regulatory network controlled by them. DNA binding is a key step for TFs regulating gene transcription. Therefore, in order to identify their target genes, it is indispensable to identify all possible DNA sequences that can be recognized and bound by TFs at the molecular level of their interactions with DNA, i.e., construction of the DNA-binding profiles of TFs. In recent years, along with the development of DNA microarray and high-throughput DNA sequencing techniques, there appeared some revolutionary new techniques for constructing DNA-binding profiles of TFs, which greatly promotes studies in this field. These techniques include ChIP-chip and ChIP-Seq for constructing in vivo DNA-binding profiles of TFs, dsDNA microarray, SELEX-SAGE, Bind-n-Seq, MMP-SELEX, EMSA-Seq, and HiTS-FLIP for constructing in vitro DNA-binding profiles of TFs. This paper reviewed these techniques.
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