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What is the chemical that helps control gene expression? 

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Such proteins are now being used to control gene expression in vivo in a ligand-dependent manner.
Open accessJournal ArticleDOI
Eileen R. Gibney, Catherine M. Nolan 
12 May 2010-Heredity
660 Citations
Thus, control of gene expression is at the heart of differentiation and development.
We suggest that the enzymes that are active in the control of gene expression should be designated as trigger enzymes.
Selective control of gene expression can thus be achieved by inhibiting specific transcription factor/DNA interactions.
Thus, these chemically inducible transcription factors are valuable tools for spatiotemporal control of gene expression that should prove valuable for research and gene therapy applications.
It complements inducible expression systems that offer temporal control of gene expression in tissues that can be treated with inducing chemicals.
Dominant regulatory control of expression of any endogenous gene can be achieved rapidly and can be also placed under chemical control.
Such factors will be powerful chemical tools for unraveling the mechanisms by which gene expression is regulated and in the long term offer considerable therapeutic potential.
It provides a deeper understanding into the mechanism through which therapeutic drugs control gene expression.
Such a control is likely to be essential in maintaining particular states of gene expression during development.

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