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Complexity and conservation of regulatory landscapes underlie evolutionary resilience of mammalian gene expression
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Complexity and conservation of regulatory landscapes underlie evolutionary resilience of mammalian gene expression
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Journal Article
Complexity and conservation of regulatory landscapes underlie evolutionary resilience of mammalian gene expression
2018
Overview
To gain insight into how mammalian gene expression is controlled by rapidly evolving regulatory elements, we jointly analysed promoter and enhancer activity with downstream transcription levels in liver samples from 15 species. Genes associated with complex regulatory landscapes generally exhibit high expression levels that remain evolutionarily stable. While the number of regulatory elements is the key driver of transcriptional output and resilience, regulatory conservation matters: elements active across mammals most effectively stabilize gene expression. In contrast, recently evolved enhancers typically contribute weakly, consistent with their high evolutionary plasticity. These effects are observed across the entire mammalian clade and are robust to potential confounders, such as the gene expression level. Using liver as a representative somatic tissue, our results illuminate how the evolutionary stability of gene expression is profoundly entwined with both the number and conservation of surrounding promoters and enhancers.
Analysis of promoter and enhancer activity and levels of downstream transcripts in liver samples from 15 mammalian species finds an association between the complexity of the regulatory landscape and the evolutionary stability of gene expression.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
