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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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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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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 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 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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The Histone Variant H2A.Z C-Terminal Domain Has Locus-Specific Differential Effects on H2A.Z Occupancy and Nucleosome

Hannah Neumann1, Celia Jeronimo2, Jean-François Lucier1,3

  • 1Department of Biology, Université de Sherbrooke, Sherbrooke, Quebec, Canada.

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|February 23, 2023
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The C-terminal region of histone variant H2A.Z is vital for its proper placement and function in regulating gene transcription in Saccharomyces cerevisiae. This region interacts with proteins to control gene expression, even at genes lacking H2A.Z in their promoters.

Keywords:
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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Histone variant H2A.Z shapes chromatin domains essential for DNA-templated processes like gene transcription.
  • The C-terminal region of H2A.Z in Saccharomyces cerevisiae is hypothesized to confer its unique functions.
  • Understanding the genome-wide roles of the H2A.Z C terminus is crucial for elucidating gene regulation mechanisms.

Purpose of the Study:

  • To investigate the genome-wide functions of the H2A.Z C-terminal region.
  • To determine the impact of replacing the H2A.Z C terminus on nucleosome positioning and H2A.Z incorporation.
  • To explore the role of the H2A.Z C terminus in global transcription regulation.

Main Methods:

  • Utilized H2A.Z derivatives with modified C termini (replaced with H2A or H2A plus an activating peptide).
  • Analyzed the distribution and positioning of these H2A.Z derivatives across the genome.
  • Assessed the necessity of the SWR1-C complex for H2A.Z derivative localization.

Main Results:

  • The H2A.Z C-terminal region is critical for maintaining H2A.Z levels and correct nucleosome positioning.
  • The specific impact on incorporation efficiency and positioning varies significantly by genomic locus.
  • H2A.Z's role in global transcription relies on its C terminus, particularly for genes lacking promoter-bound H2A.Z.
  • SWR1-C is essential for localizing all tested H2A.Z derivatives, indicating their interactions with SWR1-C are not the cause of differential association.

Conclusions:

  • The Saccharomyces cerevisiae H2A.Z C-terminal region mediates gene regulation through interactions with effector proteins and chaperones.
  • These interactions facilitate H2A.Z incorporation into specific regulatory regions and promote gene expression.
  • A chimeric protein with an acidic activating region partially restored H2A.Z C-terminal functions, suggesting the native C terminus interacts with similar targets.