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Related Concept Videos

Nucleosome Remodeling02:54

Nucleosome Remodeling

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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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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 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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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Related Experiment Video

Updated: May 20, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Histone modification-driven structural remodeling unleashes DNMT3B in DNA methylation.

Chao-Cheng Cho1, Hsun-Ho Huang1,2, Bo-Chen Jiang1

  • 1Institute of Molecular Biology, Academia Sinica, Taipei, Taiwan 11529, ROC.

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|March 26, 2025
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Histone modifications dynamically regulate DNA methyltransferase 3B (DNMT3B) activity. Specific histone marks trigger conformational changes in DNMT3B, enhancing its DNA methylation function.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Biochemistry

Background:

  • DNA methyltransferase 3B (DNMT3B) is crucial for DNA methylation patterns in mammalian development.
  • The regulation of DNMT3B by histone modifications is not fully understood.
  • Histone modifications influence gene expression and chromatin structure.

Purpose of the Study:

  • To investigate the dynamic interplay between DNMT3B and histone modifications.
  • To elucidate the mechanism by which histone modifications regulate DNMT3B activity.
  • To explore the role of DNMT3B conformational changes in DNA methylation.

Main Methods:

  • Utilized modified histone H3 peptides for in vitro assays.
  • Employed structural biology techniques to observe protein dynamics.
  • Analyzed the methyltransferase activity of wild-type and mutant DNMT3B.

Main Results:

  • The PWWP domain of DNMT3B shows dynamic conformational changes upon interaction with H3K4me0K36me3.
  • Histone modification triggers a transition from autoinhibitory to active conformations for PWWP and ADD domains.
  • The active conformation facilitates simultaneous interaction with H3 and DNA, enhancing methylation.
  • A prostate cancer-associated DNMT3B mutant (R545C) exhibits increased dynamism and aberrant hypermethylation.

Conclusions:

  • Histone modifications act as triggers for DNMT3B conformational rearrangements.
  • These rearrangements unleash DNMT3B's DNA methylation activity through specific domain interactions.
  • Aberrant DNMT3B dynamics, as seen in the R545C mutant, can lead to pathological DNA hypermethylation.