The present disclosure provides methods for preparing preparations of
DNA from a subject useful for determining a
methylation status of a genomic
region of interest. The methods comprise extracting
DNA from a sample of a subject;
copying one or more template
DNA molecules from the extracted DNA to generate one or more copied DNA molecules; transferring
methylation status from the one or more template DNA molecules to the one or more copied DNA molecules, thereby generating one or more
methylation-transferred DNA molecules; and repeating the
copying and transfer steps to generate a
library of amplified DNA molecules comprising the one or more methylation-transferred DNA molecules. The method may employ isothermal extension at 60°C and strand-invasion or linked primers.