High-resolution analysis of cytosine methylation in ancient DNA

Bastien Llamas, Michael Holland, Kefei Chen, Jennifer Cropley, Alan Cooper, Catherine Suter

    Research output: Contribution to journalArticle

    50 Citations (Scopus)

    Abstract

    Epigenetic changes to gene expression can result in heritable phenotypic characteristics that are not encoded in the DNA itself, but rather by biochemical modifications to the DNA or associated chromatin proteins. Interposed between genes and environment, these epigenetic modifications can be influenced by environmental factors to affect phenotype for multiple generations. This raises the possibility that epigenetic states provide a substrate for natural selection, with the potential to participate in the rapid adaptation of species to changes in environment. Any direct test of this hypothesis would require the ability to measure epigenetic states over evolutionary timescales. Here we describe the first single-base resolution of cytosine methylation patterns in an ancient mammalian genome, by bisulphite allelic sequencing of loci from late Pleistocene Bison priscus remains. Retrotransposons and the differentially methylated regions of imprinted loci displayed methylation patterns identical to those derived from fresh bovine tissue, indicating that methylation patterns are preserved in the ancient DNA. Our findings establish the biochemical stability of methylated cytosines over extensive time frames, and provide the first direct evidence that cytosine methylation patterns are retained in DNA from ancient specimens. The ability to resolve cytosine methylation in ancient DNA provides a powerful means to study the role of epigenetics in evolution.

    Original languageEnglish
    Article numbere30226
    Pages (from-to)1-6
    Number of pages6
    JournalPLoS One
    Volume7
    Issue number1
    DOIs
    Publication statusPublished - 2012

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  • Cite this

    Llamas, B., Holland, M., Chen, K., Cropley, J., Cooper, A., & Suter, C. (2012). High-resolution analysis of cytosine methylation in ancient DNA. PLoS One, 7(1), 1-6. [e30226]. https://doi.org/10.1371/journal.pone.0030226