Journal
NATURE GENETICS
Volume 41, Issue 4, Pages 498-503Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ng.319
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Funding
- Korean Ministry of Science and Technology
- National Research Foundation of Korea [과C6A2402] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Variation in gene expression is an essential material for biological diversity among single cells(1-3), individuals(4-6) and populations or species(7-9). Here we show that expression variability is an intrinsic property that persists at those different levels. Each promoter seems to have a unique capacity to respond to external signals that can be environmental, genetic or even stochastic. Our investigation into nucleosome organization of variably responding promoters revealed a commonly positioned nucleosome at a critical regulatory region where most transcription start sites and TATA elements are located, a deviation from typical nucleosome-free status. The nucleotide sequences in this region of variable promoters showed a high propensity for DNA bending and a periodic distribution of particular dinucleotides, encoding preferences for DNA-nucleosome interaction. Variable expression is likely to occur during removal of this nucleosome for gene activation. This is a unique example of how promoter sequences intrinsically encode regulatory flexibility, which is vital for biological processes such as adaptation, development and evolution.
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