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Gene expression divergence in yeast is coupled to evolution of DNA-encoded nucleosome organization

Abstract

Eukaryotic transcription occurs within a chromatin environment, whose organization has an important regulatory function and is partly encoded in cis by the DNA sequence itself. Here, we examine whether evolutionary changes in gene expression are linked to changes in the DNA-encoded nucleosome organization of promoters. We find that in aerobic yeast species, where cellular respiration genes are active under typical growth conditions, the promoter sequences of these genes encode a relatively open (nucleosome-depleted) chromatin organization. This nucleosome-depleted organization requires only DNA sequence information, is independent of any cofactors and of transcription, and is a general property of growth-related genes. In contrast, in anaerobic yeast species, where cellular respiration genes are relatively inactive under typical growth conditions, respiration gene promoters encode relatively closed (nucleosome-occupied) chromatin organizations. Our results suggest a previously unidentified genetic mechanism underlying phenotypic diversity, consisting of DNA sequence changes that directly alter the DNA-encoded nucleosome organization of promoters.

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Figure 1: S. cerevisiae and C. albicans show large-scale changes in the transcriptional programs of cellular respiration and mitochondrial function genes.
Figure 2: The expression divergence of cellular respiration genes is accompanied by changes in the DNA-encoded nucleosome organization of their promoters.
Figure 3: The DNA-encoded nucleosome organization of promoters driving genes involved in cellular respiration has diverged between S. cerevisiae and C. albicans.
Figure 4: The emergence of anaerobic yeast species coincides with an evolutionary change in the DNA-encoded nucleosome organization of cellular respiration gene promoters.
Figure 5: A global relationship between evolutionary changes in the DNA-encoded nucleosome organization and evolutionary changes in expression.

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Acknowledgements

We acknowledge with gratitude the gift of strains, protocols and advice from J. Berman (University of Minnesota), and thank H. Kelkar (University of North Carolina) for help with the Illumina sequencing data and the members of our respective laboratories for discussions and comments on the manuscript. This work was supported by grants from the US National Institutes of Health to J.D.L., from the NIH to J.W., and from the European Research Council (ERC) and NIH to E.S. N.K. is a Clore scholar. E.S. is the incumbent of the Soretta and Henry Shapiro career development chair.

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Y.F., I.K.M., J.D.L., J.W. and E.S. conceived and designed the experiments. Y.F.-M. and I.K.M. performed the experiments. P.M. performed the sequencing. Y.F., N.K., Y.L., J.D.L., J.W. and E.S. analyzed the data. Y.F., J.D.L., J.W. and E.S. wrote the paper.

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Correspondence to Jonathan Widom or Eran Segal.

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Field, Y., Fondufe-Mittendorf, Y., Moore, I. et al. Gene expression divergence in yeast is coupled to evolution of DNA-encoded nucleosome organization. Nat Genet 41, 438–445 (2009). https://doi.org/10.1038/ng.324

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