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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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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 process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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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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Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...
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CAF-1 and Rtt101p function within the replication-coupled chromatin assembly network to promote H4 K16ac, preventing

Tiffany J Young1,2,3, Yi Cui2,3,4, Claire Pfeffer1

  • 1Department of Biochemistry, Purdue University, West Lafayette, Indiana, United States of America.

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|December 7, 2020
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Summary
This summary is machine-generated.

Chromatin assembly pathways control histone modifications during DNA replication. A specific pathway involving CAF-1 prevents silencing at inappropriate sites, highlighting distinct cellular mechanisms for chromatin regulation.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Yeast Genetics

Background:

  • Replication-coupled chromatin assembly involves multiple pathways coordinating nucleosome deposition.
  • Histone modifications regulate gene expression and chromatin structure.
  • Distinct chromatin assembly pathways may lead to varied epigenetic outcomes.

Purpose of the Study:

  • To elucidate the organization of a specific chromatin assembly pathway dependent on CAF-1 in Saccharomyces cerevisiae.
  • To investigate the role of this CAF-1-dependent pathway in regulating histone H4 K16 acetylation.
  • To determine the function of this pathway in preventing aberrant gene silencing.

Main Methods:

  • Genetic analysis in Saccharomyces cerevisiae.
  • Characterization of a crippled HMR locus to assess gene silencing.
  • Investigation of protein interactions and functional dependencies, including cullin Rtt101p.

Main Results:

  • Identified a CAF-1-dependent pathway regulating histone H4 K16 acetylation.
  • Demonstrated that factors in this pathway are crucial for preventing silencing at inappropriate genomic sites.
  • Showed this pathway requires Rtt101p but is distinct from Rtt101p-dependent histone H3 ubiquitination and Rtt106p.

Conclusions:

  • Cells possess the ability to generate diverse chromatin modification patterns during DNA replication.
  • Differential histone processing and deposition by distinct chromatin assembly pathways create varied epigenetic landscapes.
  • The CAF-1-dependent pathway plays a specific role in maintaining epigenetic integrity.