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Epigenetic regulation and the variability of gene expression


We characterized the genetic variability of gene expression in terms of trans and cis variability for each yeast transcript. Genes that are highly regulated by nucleosomes showed a high degree of trans variability. From the expression profiles of mutants for various chromatin modifiers, we found that trans-variable genes are distinctly regulated at the chromatin level. The effect of chromatin regulators was highly significant, even when compared with that of transcription factors. The DNA-binding activities of transcription factors had a low influence on trans variability. In the case of the basal transcription factor TBP and TBP-associated factor TAF1, expression variability was coupled with the histone acetyltransferase activities of TAF1 and other factors, rather than with the binding of TBP to DNA. Additionally, we found that the correlation of TATA-box presence and expression variability could be explained in terms of chromatin regulation. The lack of activating histone modifications may subject TATA-containing promoters to chromatin regulation processes. Our results propose that epigenetic regulation has a central role in the variation and evolution of gene expression.

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Figure 1: Schematic of cis- and trans-variability identification.
Figure 2: Correspondence between expression variability and expression divergence.
Figure 3: Impact of chromatin regulation on expression variability.
Figure 4: Effects of transcription factors on expression variability.
Figure 5: High expression variability of TATA-containing genes explained by chromatin regulation effects.


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We thank R. Brem for valuable comments and suggestions and M. Kupiec for providing the chromatin modifier compendium. This work was supported by grants from the Korean Ministry of Science and Technology to Y.-J.K. (Creative Research Initiatives and Epigenomic Research of Human Disease).

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Authors and Affiliations



J.K.C. designed the methodology, performed the analysis and wrote the paper; Y.-J.K. helped with the analysis and wrote and revised the paper.

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Correspondence to Young-Joon Kim.

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The authors declare no competing financial interests.

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Choi, J., Kim, YJ. Epigenetic regulation and the variability of gene expression. Nat Genet 40, 141–147 (2008).

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