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Long Single-Stranded DNA with Site-Specific Modifications to Enable Single-Base-Resolution Epigenetics.

Chenyou Zhu1, Yin Xu2, Ziyang Hao3

  • 1Engineering Research Center of Advanced Rare Earth Materials (Ministry of Education), Department of Chemistry, Tsinghua University, Beijing, 100084, P.R. China.

Angewandte Chemie (International Ed. in English)
|November 20, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a method for synthesizing modified long single-stranded DNA (ssDNA). This enables precise analysis of DNA methylation patterns, revealing how 5-methylcytosine density impacts epigenetic dynamics and maintenance.

Keywords:
5‐Methyl cytosineEpigeneticsLong single‐stranded DNASingle‐base resolutionSite‐specific modifications

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Synthetic Biology

Background:

  • Epigenetic modifications, such as DNA methylation, play crucial roles in gene regulation.
  • Understanding the dynamics of DNA methylation at specific genomic loci is essential for deciphering cellular processes.
  • Current methods for analyzing epigenetic modifications in long DNA sequences have limitations in precision and scope.

Purpose of the Study:

  • To develop a novel method for synthesizing site-specifically modified long single-stranded DNA (ssDNA).
  • To enable high-resolution analysis of 5-methylcytosine (5mC) epigenetic dynamics in mammalian cells.
  • To investigate the relationship between 5mC density and its maintenance at specific genomic loci.

Main Methods:

  • Development of a robust chemical synthesis strategy for producing long ssDNA with controlled 5mC modifications.
  • Application of the synthesized ssDNA for single-base-resolution analysis of epigenetic patterns in mammalian cell systems.
  • Quantitative assessment of 5mC site density and its correlation with epigenetic maintenance mechanisms.

Main Results:

  • Successful synthesis of long ssDNA with high purity and fidelity, incorporating defined 5-methylcytosine (5mC) patterns.
  • Enabled single-base-resolution analysis of 5mC epigenetic dynamics at specific genomic loci in mammalian cells.
  • Demonstrated a synergistic correlation between the density of 5mC sites and their maintenance, providing insights into epigenetic stability.

Conclusions:

  • The developed method provides a powerful tool for creating precisely modified long ssDNA, advancing epigenetic research.
  • This approach facilitates detailed investigation of epigenetic dynamics, particularly DNA methylation, at the single-base level.
  • The findings open new avenues for precise epigenetic manipulation and hold potential for therapeutic applications in epigenetic regulation.