Abstract
While overall DNA methylation decreases with age, CpG-rich areas of the genome can become hypermethylated. Hypermethylation near transcription start sites typically decreases gene expression. Klotho (KL) is important in numerous age-associated pathways including insulin/IGF1 and Wnt signaling and naturally decreases with age in brain, heart, and liver across species. Brain tissues from young and old rhesus monkeys were used to determine whether epigenetic modification of the KL promoter underlies age-related decreases in mRNA and protein levels of KL. The KL promoter in genomic DNA from brain white matter did not show evidence of oxidation in vivo but did exhibit an increase in methylation with age. Further analysis identified individual CpG motifs across the region of interest with increased methylation in old animals. In vitro methyl modification of these individual cytosine residues confirmed that methylation of the promoter can decrease gene transcription. These results provide evidence that changes in KL gene expression with age may, at least in part, be the result of epigenetic changes to the 5′ regulatory region.
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Acknowledgements
The authors would like to thank Dr. CiDi Chen for cloning of the human KL promoter and for insightful discussions during the early stage of project development. We also thank Dr. J. David Sweatt, Dr. Joerg Kumbrink, Ms. Tracey Tucker, and Mr. Mike Nagle for helpful discussions of the manuscript. This work was funded by the National Institute of Health/National Institute of Aging P01 AG-000001-33 (CRA and DLR), the National Institute of Health/National Institute of Aging 5T32AG000115-24 and NIH/NIA K99/R00 AG034989-01 (GDK), the and National Institute of Health/National Center for Research Resources P51-RR000165 (Yerkes Center).
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King, G.D., Rosene, D.L. & Abraham, C.R. Promoter methylation and age-related downregulation of Klotho in rhesus monkey. AGE 34, 1405–1419 (2012). https://doi.org/10.1007/s11357-011-9315-4
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DOI: https://doi.org/10.1007/s11357-011-9315-4