Nucleic Acids Research Advance Access originally published online on December 14, 2006
Nucleic Acids Research 2007 35(2):406-413; doi:10.1093/nar/gkl1057
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Nucleic Acids Research, 2007, Vol. 35, No. 2 406-413
© 2006 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Genomics |
G-quadruplexes in promoters throughout the human genome
1 Cambridge University Chemical Laboratory, University of Cambridge Lensfield Road, Cambridge CB2 1EW, UK 2 Wellcome Trust Sanger Institute, Hinxton Cambridge CB10 1SA, UK
*To whom correspondence should be addressed. Tel: +44 1223 336447; Fax: +44 1223 336913; Email: sb10031{at}cam.ac.uk
Received October 18, 2006. Revised November 17, 2006. Accepted November 18, 2006.
Certain G-rich DNA sequences readily form four-stranded structures called G-quadruplexes. These sequence motifs are located in telomeres as a repeated unit, and elsewhere in the genome, where their function is currently unknown. It has been proposed that G-quadruplexes may be directly involved in gene regulation at the level of transcription. In support of this hypothesis, we show that the promoter regions (1 kb upstream of the transcription start site TSS) of genes are significantly enriched in quadruplex motifs relative to the rest of the genome, with >40% of human gene promoters containing one or more quadruplex motif. Furthermore, these promoter quadruplexes strongly associate with nuclease hypersensitive sites identified throughout the genome via biochemical measurement. Regions of the human genome that are both nuclease hypersensitive and within promoters show a remarkable (230-fold) enrichment of quadruplex elements, compared to the rest of the genome. These quadruplex motifs identified in promoter regions also show an interesting structural bias towards more stable forms. These observations support the proposal that promoter G-quadruplexes are directly involved in the regulation of gene expression.
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