Concatenated Coiled-Coil Tag for Highly Efficient, Small Molecule-Inducible Upregulation of Endogenous Mammalian Genes.

Regulation of epigenomic functions requires controlled site-specific alteration of epigenetic information. This can be achieved by using designed DNA-binding domains, associated with effector domains, that function as targeted transcription factors or epigenetic modifiers. These effectors have been employed to study the implications of epigenetic modifications, and sequence-specific targeting has been instrumental in understanding the effect of these modification on gene regulation. Ultimately, these tools could be used for therapeutic applications to revert the epigenetic aberrations that have been linked to various diseases. The ability to spatiotemporally control gene expression is especially important for precise regulation of the epigenomic state. In this chapter, we describe the protocol for achieving highly efficient small molecule-inducible transcriptional activation of endogenous mammalian genes, mediated by a dCas9-based system that recruits transcriptional activation domains binding to a chain of concatenated coiled-coil peptides.