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Histone Variants at the Centromere02:30

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Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
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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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The Nucleosome Core Particle01:12

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
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Expression Analysis of Mammalian Linker-histone Subtypes
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Mice without macroH2A histone variants.

John R Pehrson1, Lakshmi N Changolkar2, Carl Costanzi2

  • 1Department of Animal Biology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA pehrson@vet.upenn.edu.

Molecular and Cellular Biology
|October 15, 2014
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Summary
This summary is machine-generated.

Macrohistone variants (macroH2As) are essential for growth and reproduction, regulating genes involved in lipid metabolism. Their absence impairs development and efficiency, highlighting their adaptive role in gene expression.

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Area of Science:

  • Epigenetics and Gene Regulation
  • Molecular Biology
  • Developmental Biology

Background:

  • Macrohistone variants (macroH2As) possess a unique structure with a C-terminal nonhistone domain.
  • They are conserved across vertebrates and implicated in gene expression regulation, but their specific targets and functions are largely unknown.

Purpose of the Study:

  • To investigate the in vivo function and biological significance of macroH2A1 and macroH2A2.
  • To elucidate the role of macroH2As in gene expression, development, and metabolism.

Main Methods:

  • Generation of knockout mice lacking both macroH2A1 and macroH2A2.
  • Analysis of developmental, growth, and reproductive parameters.
  • Gene expression profiling in fetal and adult liver tissues, examining effects of fasting.

Main Results:

  • MacroH2As are dispensable for early development but crucial for prenatal/postnatal growth and reproductive efficiency.
  • MacroH2A.1 and macroH2A.2 exhibit overlapping distributions and synergistic or opposing effects on gene expression.
  • MacroH2A-dependent gene regulation is specific, particularly impacting lipid metabolism genes (e.g., leptin receptor) in adult liver.
  • Gene regulation by macroH2As changes during postnatal development and is influenced by fasting.

Conclusions:

  • MacroH2As play a significant role in mammalian growth, reproduction, and adaptive metabolic regulation.
  • These histone variants fine-tune gene expression, with a notable focus on lipid metabolism in the liver.
  • MacroH2A function is dynamic, adapting to developmental stages and physiological conditions like fasting.