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Gene clustering pattern, promoter architecture, and gene expression stability in eukaryotic genomes
Yong H. Woo and Wen-Hsiung Li
Proceedings of the National Academy of Sciences of the United States of America
Vol. 108, No. 8 (February 22, 2011), pp. 3306-3311
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/41060923
Page Count: 6
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A balance between gene expression stability and evolvability is essential for the long-term maintenance of a living system. In this paper, we studied whether the genetic and epigenetic properties of the promoter affect gene expression variability. We hypothesized that upstream distance and orientation (head-to-head or head-to-tail) are important for the promoter architecture and gene expression variability. We found that in budding yeast genes with a short upstream distance tend to have low gene expression variability, and their promoter is flanked by strongly positioned nucleosomes and tends to have low nucleosome occupancy. These observations suggest that in vivo positioning of the flanking nucleosomes facilitates stable nucleosome depletion at the core promoter region and enhances gene expression stability. Head-tohead genes have, on average, lower gene expression variability, greater nucleosome depletion at the core promoter region, and more strongly positioned nucleosomes that flank the core promoter than do head-to-tail genes. These observations hold for diverse eukaryotes. In complex organisms such as mammals, only a small fraction of head-to-tail genes have retained a short upstream distance, probably because the promoter may not be flanked by a strongly positioned nucleosome on the upstream side.
Proceedings of the National Academy of Sciences of the United States of America © 2011 National Academy of Sciences