Publication Date:
2008-11-26
Description:
Transcription factor binding sites are being discovered at a rapid pace. It is now necessary to turn attention towards understanding how these sites work in combination to influence gene expression. Quantitative models that accurately predict gene expression from promoter sequence will be a crucial part of solving this problem. Here we present such a model, based on the analysis of synthetic promoter libraries in yeast (Saccharomyces cerevisiae). Thermodynamic models based only on the equilibrium binding of transcription factors to DNA and to each other captured a large fraction of the variation in expression in every library. Thermodynamic analysis of these libraries uncovered several phenomena in our system, including cooperativity and the effects of weak binding sites. When applied to the S. cerevisiae genome, a model of repression by Mig1 (which was trained on synthetic promoters) predicts a number of Mig1-regulated genes that lack significant Mig1-binding sites in their promoters. The success of the thermodynamic approach suggests that the information encoded by combinations of cis-regulatory sites is interpreted primarily through simple protein-DNA and protein-protein interactions, with complicated biochemical reactions-such as nucleosome modifications-being downstream events. Quantitative analyses of synthetic promoter libraries will be an important tool in unravelling the rules underlying combinatorial cis-regulation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2677908/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2677908/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gertz, Jason -- Siggia, Eric D -- Cohen, Barak A -- R01 GM078222/GM/NIGMS NIH HHS/ -- R01 GM078222-01A1/GM/NIGMS NIH HHS/ -- R01 GM078222-02/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Jan 8;457(7226):215-8. doi: 10.1038/nature07521. Epub 2008 Nov 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Genome Sciences, Department of Genetics, Washington University in Saint Louis School of Medicine, 4444 Forest Park Avenue, St Louis, Missouri 63108, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19029883" target="_blank"〉PubMed〈/a〉
Keywords:
Allosteric Site
;
DNA/genetics/metabolism
;
DNA-Binding Proteins/metabolism
;
Down-Regulation
;
*Gene Expression Regulation, Fungal
;
*Gene Library
;
Genes, Synthetic/*genetics
;
Genome, Fungal/*genetics
;
Models, Genetic
;
Promoter Regions, Genetic/*genetics
;
Regulatory Sequences, Nucleic Acid/*genetics
;
Repressor Proteins/metabolism
;
Saccharomyces cerevisiae/*genetics
;
Saccharomyces cerevisiae Proteins/metabolism
;
Thermodynamics
;
Transcription Factors/metabolism
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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