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Library Preparation for Genome-Wide DNA Methylation Profiling.

Fei-Man Hsu1, Matteo Pellegrini1, Pao-Yang Chen2

  • 1Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, CA, USA.

Bio-Protocol
|November 12, 2025
PubMed
Summary
This summary is machine-generated.

This study presents a cost-effective, customizable protocol for whole-genome bisulfite sequencing (WGBS) library preparation. This method enables high-resolution DNA methylation profiling without commercial kits, supporting scalable epigenomic research.

Keywords:
DNA methylationEpigeneticsEpigenomicsLibrary preparationNext generation sequencingWhole genome bisulfite sequencing

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Area of Science:

  • Epigenetics and Molecular Biology
  • Genomics and Bioinformatics

Background:

  • DNA methylation is a crucial epigenetic modification regulating gene expression, development, and genome stability.
  • Whole genome bisulfite sequencing (WGBS) is a standard epigenomic technique for mapping DNA methylation at single-base resolution.

Purpose of the Study:

  • To provide a detailed, step-by-step protocol for WGBS library construction from genomic DNA.
  • To offer a flexible, cost-effective, and scalable alternative to commercial WGBS library preparation kits.

Main Methods:

  • The protocol involves RNaseA treatment, DNA shearing, end-repair and A-tailing, adapter ligation, bisulfite conversion, library amplification, and quantification.
  • It utilizes self-prepared reagents and customizable index systems for flexible multiplexing.

Main Results:

  • The developed workflow enables high-resolution, unbiased DNA methylation profiling at single-base resolution.
  • The method is optimized for cost-effectiveness and scalability, suitable for high-throughput sample processing.

Conclusions:

  • This protocol provides a comprehensive and adaptable workflow for WGBS library preparation, suitable for diverse species and experimental designs.
  • The flexibility in reagent preparation and indexing supports cost-effective, scalable methylome profiling for various research applications.