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Reconstructing DNA methylation maps of ancient populations.
Arielle Barouch1,2, Yoav Mathov1,3, Eran Meshorer1,3
1Department of Genetics, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 9190401, Israel.
Nucleic Acids Research
|January 23, 2024
Summary
Researchers developed a new method to map ancient DNA (aDNA) methylation in populations, overcoming limitations of previous techniques. This advance enables large-scale paleoepigenetic studies of human history using diverse ancient samples.
Area of Science:
- Paleogenomics
- Epigenetics
- Evolutionary Biology
Background:
- Ancient DNA (aDNA) methylation offers insights into ancient gene activity and evolutionary regulation.
- Current methods for reconstructing aDNA methylation maps are limited to high-coverage shotgun sequencing, restricting analysis to a small fraction of available samples.
- Most ancient samples are processed using targeted in-situ hybridization capture sequencing.
Purpose of the Study:
- To develop novel methods for reconstructing aDNA methylation maps from samples not sequenced via high-coverage shotgun sequencing.
- To enable population-level DNA methylation mapping from ancient samples.
- To facilitate large-scale paleoepigenetic research by utilizing a broader range of ancient DNA samples.
Main Methods:
- Developed computational methods to reconstruct population-level aDNA methylation maps by pooling data from multiple individuals.
- Applied these methods to samples sequenced with in-situ hybridization capture sequencing.
- Established guidelines for comparative studies of ancient populations and controlling false discovery rates in differentially methylated regions.
Main Results:
- Successfully reconstructed DNA methylation maps from pooled ancient samples, demonstrating their ability to capture meaningful biological information.
- The reconstructed maps allowed for the detection of differential methylation across ancient populations.
- Validated the utility of the new approach for large-scale paleoepigenetic analyses.
Conclusions:
- The developed methods significantly expand the scope of ancient DNA methylation studies by enabling analysis of previously inaccessible sample types.
- This breakthrough opens a new frontier in paleoepigenetics, allowing for the tracing of DNA methylation changes across human history using extensive ancient sample collections.
- The approach provides a robust framework for comparative population epigenetics in ancient contexts.
