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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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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Resetting histone modifications during human prenatal germline development.

Rui Gao1, Shiyang Zeng2, Dongxu Yang1,2

  • 1Clinical and Translation Research Center of Shanghai First Maternity & Infant Hospital, Shanghai Key Laboratory of Signaling and Disease Research, Frontier Science Center for Stem Cell Research, School of Life Sciences and Technology, Tongji University, Shanghai, China.

Cell Discovery
|February 3, 2023
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Summary
This summary is machine-generated.

This study maps key histone modifications in human germ cells during prenatal development. It reveals how these marks regulate gene expression in a unique, hypomethylated environment, offering insights into germ cell reprogramming.

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Genomics

Background:

  • Histone modifications are crucial for gene regulation and change dynamically during early development.
  • Understanding these epigenetic changes during human prenatal germline development is essential but largely unknown.

Purpose of the Study:

  • To map genome-wide profiles of key histone modifications in human primordial germ cells (hPGCs) during prenatal development (weeks 8-23).
  • To elucidate the role of these modifications in regulating gene expression within the unique, hypomethylated environment of hPGCs.

Main Methods:

  • Utilized Ultra-Low Input Native ChIP sequencing (ULI-NChIP-seq) to profile histone modifications.
  • Analyzed genome-wide patterns of H3K4me3, H3K27me3, and H3K9me3 in hPGCs.

Main Results:

  • H3K4me3 showed promoter enrichment, positively correlating with gene expression in hypomethylated hPGCs.
  • H3K27me3 had low enrichment but regulated bivalent promoters and limited X chromosome reactivation in female hPGCs.
  • H3K9me3 and H3K27me3 jointly regulated demethylation-resistant regions, counteracting DNA demethylation and H3K4me3 activation signals.

Conclusions:

  • Provides the first roadmap of three core histone modifications during human PGC development.
  • Elucidates the epigenetic architecture of germ cell reprogramming in a highly hypomethylated DNA context.