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024 7 _ |a 10.1093/bioadv/vbaf005
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100 1 _ |a Saßmannshausen, Zoe
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245 _ _ |a estiMAge: development of a DNA methylation clock to estimate the methylation age of single cells.
260 _ _ |a Oxford
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|b Oxford University Press
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520 _ _ |a Since their introduction about 10 years ago, methylation clocks have provided broad insights into the biological age of different species, tissues, and in the context of several diseases or aging. However, their application to single-cell methylation data remains a major challenge, because of the inherent sparsity of such data, as many CpG sites are not covered. A methylation clock applicable on single-cell level could help to further disentangle the processes that drive the ticking of epigenetic clocks.We have developed estiMAge ('estimation of Methylation Age'), a framework that exploits redundancy in methylation data to substitute missing CpGs of trained methylation clocks in single cells. Using Euclidean distance as a measure of similarity, we determine which CpGs covary with the required CpG sites of an epigenetic clock and can be used as surrogates for clock CpGs not covered in single-cell experiments. estiMAge is thus a tool that can be applied to standard epigenetic clocks built on elastic net regression, to achieve bulk and single-cell resolution. We show that estiMAge can accurately predict the ages of young and old hepatocytes and can be used to generate single-cell versions of publicly available epigenetic clocks.The source code and instructions for usage of estiMAge are available at https://github.com/DivEpigenetics/estiMAge.
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700 1 _ |a Blank, Lisa Marie
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700 1 _ |a Solé-Boldo, Llorenç
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700 1 _ |a Lyko, Frank
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700 1 _ |a Raddatz, Günter
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773 _ _ |a 10.1093/bioadv/vbaf005
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