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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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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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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 histone demethylase Lsd1 regulates multiple repressive gene programs during T cell development.

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The histone demethylase Lsd1 (Kdm1a) is crucial for T cell development by silencing stem cell genes. Its absence blocks T cell maturation and causes gene overexpression, highlighting Lsd1

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Area of Science:

  • Immunology
  • Epigenetics
  • Molecular Biology

Background:

  • T cell lineage commitment involves transcriptional shifts from progenitor to mature T cell signatures.
  • Epigenetic mechanisms underlying these transcriptional changes during thymocyte development are not fully understood.

Purpose of the Study:

  • To investigate the role of the histone demethylase Lsd1 (Kdm1a) in epigenetic regulation during thymocyte maturation.
  • To determine how Lsd1 influences the silencing of stem/progenitor and other repressive gene programs.

Main Methods:

  • Analysis of transcriptional profiles in developing thymocytes.
  • Genetic deletion of Lsd1 in thymocytes.
  • Assessment of gene expression and histone modifications (H3K4 trimethylation) in Lsd1-deficient cells.

Main Results:

  • Lsd1 (Kdm1a) deletion blocks late T cell development at the CD4+CD8+ stage.
  • Lsd1 deficiency leads to overexpression of interferon response genes and genes regulated by repressors like Gfi1, Bcl6, and Bcl11b.
  • Overexpression is not always linked to increased H3K4 trimethylation, suggesting indirect roles for Lsd1.

Conclusions:

  • Lsd1 plays a critical role in extinguishing stem/progenitor and other repressive gene programs during T cell development.
  • Lsd1 is essential for the epigenetic regulation of multiple gene signatures required for normal thymocyte maturation.