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Updated: Jun 12, 2025

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Deciphering meiotic chromatin organization by SYCP3.

Shimeng Guo1,2, Yiran Zhang1, Caifeng Fei1

  • 1Institute of Reproductive Health & School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China.

Nucleic Acids Research
|June 9, 2025
PubMed
Summary
This summary is machine-generated.

This study maps the distribution of SYCP3, a key protein in meiosis, revealing its preference for open chromatin and specific DNA sequences in mouse cells. SYCP3 occupancy dynamics are linked to transcription and chromosome structure during meiosis.

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Area of Science:

  • Cell Biology
  • Genetics
  • Molecular Biology

Background:

  • Meiosis involves unique chromatin organization, including the synaptonemal complex, essential for homologous chromosome pairing.
  • The genome-wide organization of meiosis-specific proteins like SYCP3 remains poorly understood despite advanced imaging techniques.

Purpose of the Study:

  • To profile the genome-wide chromatin occupancy of SYCP3 during mouse meiosis.
  • To understand the regulatory principles governing SYCP3 localization and its relationship with chromatin states and other meiotic proteins.

Main Methods:

  • Chromatin immunoprecipitation followed by sequencing (ChIP-seq) to map SYCP3 and SYCP1 occupancy.
  • Analysis of open chromatin regions using ATAC-seq data.
  • Integration of SYCP3 occupancy data with transcriptional and repeat element information.

Main Results:

  • SYCP3 preferentially binds to open chromatin regions during mouse meiosis.
  • SYCP3 occupancy is maintained from leptotene to pachytene stages, influenced by transcription and fibrous assembly.
  • SYCP3 is enriched at specific SINE repeats, and SYCP1 occupies a subset of SYCP3 regions with high cohesin levels.

Conclusions:

  • Genome-wide profiling of SYCP3 reveals its dynamic association with chromatin during meiosis.
  • SYCP3 localization is modulated by chromatin accessibility, transcriptional activity, and specific repetitive elements.
  • These findings provide insights into the structural organization of the synaptonemal complex and its regulation.