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Whole Genome Methylation Sequencing via Enzymatic Conversion (EM-seq): Protocol, Data Processing, and Analysis

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Whole genome bisulfite sequencing (WGBS) has been the gold standard technique for base resolution analysis of DNA methylation for the last 15 years. It has been, however, associated with technical biases, which lead to overall overestimation of global and regional methylation values, and significant artifacts in extreme cytosine-rich DNA sequence contexts. Enzymatic conversion of cytosine is the newest approach, set to replace entirely the use of the damaging bisulfite conversion of DNA. The EM-seq technique utilizes TET2, T4-BGT, and APOBEC in a two-step conversion process, where the modified cytosines are first protected by oxidation and glucosylation, followed by deamination of all unmodified cytosines to uracil. As a result, EM-seq is degradation-free and bias-free, requires low DNA input, and produces high library yields with longer reads, little batch variation, less duplication, uniform genomic coverage, accurate methylation over a larger number of captured CpGs, and no sequence-specific artifacts.

Original languageEnglish
Title of host publicationHigh Throughput Gene Screening
Subtitle of host publicationMethods and Protocols
EditorsValerie J. Carabetta, Olaitan Akintunde
Place of PublicationCamden, NJ, USA
Pages73-98
Number of pages26
Volume2866
ISBN (Electronic)978-1-0716-4192-7
DOIs
Publication statusPublished - 2025

Publication series

NameMethods in molecular biology (Clifton, N.J.)
PublisherHumana Press
ISSN (Print)1064-3745

Keywords / Materials (for Non-textual outputs)

  • APOBEC
  • Bismark
  • BS-seq
  • DNA methylation
  • EM-seq
  • Enzymatic methylome sequencing
  • Nextflow
  • SeqMonk
  • T4-BGT
  • TET2
  • WGBS

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