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Artificial transcription factors (ATFs) are designed to mimic natural transcription factors in the control of gene expression and are comprised of domains for
DNA
binding and gene regulation. ATF domains are modular, interchangeable, and can be composed of protein-based or nonpeptidic moieties, yielding DNA-interacting regulatory molecules that can either activate or inhibit transcription. Sequence-specific targeting is a key determinant in ATF activity, and DNA-binding domains such as natural zinc fingers and synthetic polyamides have emerged as useful DNA targeting molecules. Defining the comprehensive DNA binding specificity of these targeting molecules for accurate manipulations of the genome can be achieved using cognate site identifier DNA microarrays to explore the entire sequence space of binding sites. Design of ATFs that regulate gene expression with temporal control will generate important molecular tools to probe cell- and tissue-specific gene regulation and to function as potential therapeutic agents.