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Histone Modification02:32

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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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Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits.  Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl...
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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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Hypoxia-Driven Histone Modifications Govern Gene Regulation for Mature Eye Lens Formation.

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Hypoxia regulates lens gene expression via histone modifications. Activating marks like H3K4me3 and H3K27ac increase, influencing fiber cell gene expression critical for lens development.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Developmental Biology

Background:

  • The lens microenvironment, particularly hypoxia, plays a crucial role in regulating gene expression.
  • Understanding the epigenetic mechanisms underlying hypoxia-induced gene regulation is vital for lens development and function.

Purpose of the Study:

  • To investigate the hypothesis that hypoxia regulates lens-specific genes through induced histone modifications.
  • To identify specific histone marks associated with hypoxia in the developing lens.

Main Methods:

  • Cultured chick lenses were exposed to hypoxic conditions (1% oxygen).
  • Genome-wide histone modifications (H3K27ac, H3K4me3) were mapped using CUT&RUN.
  • RNA sequencing identified hypoxia-responsive genes.
  • Inhibitors of histone-modifying enzymes were used to assess functional requirements.

Main Results:

  • Hypoxia increased activating histone modifications (H3K4me3, H3K9ac, H3K14ac, H3K27ac) while repressive marks remained unchanged.
  • Specific H3K4me3 and H3K27ac regions were linked to over 900 upregulated and 350 downregulated fiber cell genes.
  • Modulation of histone writers/erasers affected hypoxia-induced gene expression.

Conclusions:

  • Hypoxia-induced histone modifications are key regulators of genes essential for mature lens formation.
  • This study provides a framework for understanding hypoxia-specific epigenetic regulation in complex tissues.