Abstract
Transcription initiation is a major control point for the precise regulation of gene expression. Our knowledge of this process has been mainly derived from protein-centric studies wherein cis-regulatory DNA sequences play a passive role, mainly in arranging the protein machinery to coalesce at the transcription start sites of genes in a spatial and temporal-specific manner. However, this is a highly dynamic process in which molecular motors such as RNA polymerase II (RNAPII), helicases, and other transcription factors, alter the level of mechanical force in DNA, rather than simply a set of static DNA–protein interactions. The double helix is a fiber that responds to flexural and torsional stress, which if accumulated, can affect promoter output as well as change DNA and chromatin structure. The relationship between DNA mechanics and the control of early transcription initiation events has been under-investigated. Genomic techniques to display topological stress and conformational variation in DNA across the mammalian genome provide an exciting new insight on the role of DNA mechanics in the early stages of the transcription cycle. Without understanding how torsional and flexural stresses are generated, transmitted, and dissipated, no model of transcription will be complete and accurate.
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David Levens declares that he has no conflict of interest.
Laura Baranello declares that she has no conflict of interest.
Fedor Kouzine declares that he has no conflict of interest.
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This article is a contribution to Special Issue “DNA Supercoiling” but has already been published in BREV, September 2016, Volume 8, Issue 3, pp 259–268, DOI 10.1007/s12551-016-0216-8.
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Levens, D., Baranello, L. & Kouzine, F. Controlling gene expression by DNA mechanics: emerging insights and challenges. Biophys Rev 8 (Suppl 1), 23–32 (2016). https://doi.org/10.1007/s12551-016-0243-5
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DOI: https://doi.org/10.1007/s12551-016-0243-5