A scalable Tn5-based method for genome-wide DNA methylation profiling in development and disease

Area of Science:

• Epigenetics
• Molecular Biology
• Genomics

Background:

• DNA methylation is a crucial epigenetic mark regulating gene expression, vital in development and disease, particularly cancer.
• Existing DNA methylation detection methods like bisulfite sequencing offer base-pair resolution but are limited by high costs and sequencing depth requirements.

Purpose of the Study:

• To develop a novel, efficient, and cost-effective method for genome-wide DNA methylation profiling.
• To enable quantitative DNA methylation analysis with reduced input DNA and sequencing demands.

Main Methods:

• Development of CmeCUT&Tag, a Tn5-based technique utilizing methylation-binding domain fusion proteins.
• Selective targeting of methylated DNA in both chromatinized and isolated DNA for adapter insertion.
• Facilitation of low-depth sequencing for quantitative analysis or optional cytosine conversion for base-pair resolution.

Main Results:

• CmeCUT&Tag enables genome-wide DNA methylation profiling with significantly reduced input and sequencing requirements.
• The method demonstrated strong concordance with established bisulfite sequencing techniques.
• Successful characterization of DNA methylation patterns across various biological contexts, including human stem cells, organoids, zebrafish embryogenesis, and tumor biopsies.
• Application in classifying brain tumor samples into distinct methylation subtypes.

Conclusions:

• CmeCUT&Tag presents a scalable and cost-effective solution for DNA methylation analysis.
• The method holds promise for advancing epigenetic research and holds potential for clinical diagnostic applications.