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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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Single-cell chromatin accessibility and transcriptomic characterization of Behcet's disease.

Wen Shi1,2, Jinguo Ye1, Zhuoxing Shi1

  • 1State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, 510060, Guangzhou, China.

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Summary

This study reveals the gene activity and epigenetic changes in Behcet's disease (BD) using single-cell multi-omics. It identifies key immune cell regulators involved in inflammation and autoimmunity in BD patients.

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Area of Science:

  • Immunology
  • Genomics
  • Epigenetics

Background:

  • Behcet's disease (BD) is a chronic vasculitis with complex immune system dysregulation.
  • A detailed understanding of gene regulation and immune responses in BD peripheral blood cells is lacking.

Purpose of the Study:

  • To comprehensively analyze the gene-regulatory profile and cellular heterogeneity in Behcet's disease.
  • To identify cell-type-specific immune responses and potential epigenetic regulators in BD.

Main Methods:

  • Multi-omic single-cell analysis of 424,817 cells from BD patients and healthy individuals.
  • Simultaneous mapping of chromatin accessibility and gene expression.
  • Integrative analysis to predict transcription factor (TF) regulators and gene-regulatory networks.

Main Results:

  • Identified widespread cell-type-specific, disease-associated active and pro-inflammatory immune responses.
  • Uncovered the epigenetic and transcriptional landscape in BD peripheral blood.
  • Predicted key TF regulators, including AP-1, NF-kB, and ETS families, involved in BD pathogenesis.

Conclusions:

  • The study provides a detailed multi-omic map of BD peripheral blood, highlighting epigenetic and transcriptional alterations.
  • Identified potential regulatory networks governing inflammation and cellular interactions in Behcet's disease.
  • Expands understanding of the immunopathology of BD at the epigenomic level.