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Related Concept Videos

Lineage Commitment01:21

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Commitment is the  process whereby stem 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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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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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Related Experiment Video

Updated: Jul 23, 2025

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H3K36 methylation maintains cell identity by regulating opposing lineage programmes.

Michael S Hoetker1,2,3,4,5,6, Masaki Yagi1,2,3,4,5,6, Bruno Di Stefano1,2,3,4,5,6

  • 1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA.

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Histone H3K36 methylation is vital for maintaining cell identity. Depleting this mark with H3K36M mutations creates a plastic cell state, enabling fibroblasts to become pluripotent by rewiring enhancers.

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Cell Biology

Background:

  • Epigenetic mechanisms maintaining cell differentiation are not fully understood.
  • Histone modifications play a key role in regulating gene expression and cell identity.

Purpose of the Study:

  • To investigate the role of H3K36 methylation in maintaining cell identity.
  • To explore how altering H3K36 methylation affects cell plasticity and pluripotency induction.

Main Methods:

  • Utilized histone mutants, specifically H3K36M, to deplete H3K36 methylation.
  • Examined cellular responses to TGFβ signaling.
  • Analyzed enhancer activity and transcription factor redirection (Sox2) using Tet-dependent mechanisms.

Main Results:

  • H3K36M mutation leads to a plastic fibroblast state poised for pluripotency acquisition.
  • H3K36M confers epithelial plasticity by reducing TGFβ sensitivity.
  • Molecularly, H3K36M decommissions mesenchymal enhancers and activates epithelial/stem cell enhancers in a Tet-dependent manner, redirecting Sox2.

Conclusions:

  • H3K36 methylation has a dual role in cell identity maintenance: sustaining cell-type-specific programs and opposing alternative lineage programs.
  • Targeting H3K36 methylation offers a novel strategy for inducing cell plasticity and pluripotency.