Profiling DNA Methylation in Human Naïve Pluripotent Stem Cells.

Area of Science:

• Epigenetics and Genomics
• Stem Cell Biology

Background:

• DNA methylation is a key epigenetic modification crucial for cellular identity and reprogramming.
• Global demethylation and locus-specific changes, including loss of imprinting, characterize naïve pluripotency in stem cells.
• Bisulfite sequencing is the gold standard for DNA methylation analysis, but requires sufficient input DNA.

Purpose of the Study:

• To present an optimized Post Bisulfite Adapter Tagging (PBAT) protocol for genome-wide DNA methylation analysis.
• To enable sensitive and parallel processing of DNA methylation datasets from low cell numbers.
• To provide a streamlined bioinformatic pipeline for analyzing DNA methylation data, including imprint control regions.

Main Methods:

• Developed and optimized a Post Bisulfite Adapter Tagging (PBAT) protocol for DNA methylation profiling.
• Utilized low cell input (minimum 50 cells) for genome-wide bisulfite sequencing.
• Established bioinformatic steps for processing raw Illumina sequencing data and analyzing DNA methylation landscapes.

Main Results:

• The PBAT method allows for quantitative mapping of DNA methylation with high sensitivity.
• The protocol is effective for analyzing samples with limited cellular material, down to 50 cells.
• The method supports parallel processing of numerous samples and includes initial bioinformatic analysis steps.

Conclusions:

• The optimized PBAT protocol offers a robust and efficient method for genome-wide DNA methylation analysis.
• This technique is particularly valuable for studies involving limited cell numbers, such as stem cell reprogramming.
• The described workflow facilitates comprehensive DNA methylation profiling and analysis of epigenetic modifications.