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Heterochromatin02:38

Heterochromatin

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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.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at...
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RNA interference (RNAi) is a cellular mechanism that inhibits gene expression by suppressing its transcription or activating the RNA degradation process. The mechanism was discovered by Andrew Fire and Craig Mello in 1998 in plants. Today, it is observed in almost all eukaryotes, including protozoa, flies, nematodes, insects, parasites, and mammals. This precise cellular mechanism of gene silencing has been developed into a technique that provides an efficient way to identify and determine the...
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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
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When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.
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How does Hsp90 function in RNAi-dependent heterochromatin assembly?

Hiroaki Kato1, Kosuke Okazaki2,3, Takeshi Urano2

  • 1Department of Biochemistry, Shimane University School of Medicine, 89-1 Enya-cho, Izumo, 693-8501, Japan. hkato@med.shimane-u.ac.jp.

Current Genetics
|July 6, 2018
PubMed
Summary

Heat-shock protein 90 (Hsp90) is crucial for RNA interference (RNAi)-dependent heterochromatin assembly in fission yeast. Further genetic screens are proposed to identify novel factors linking Hsp90 to RNAi pathways.

Keywords:
Fission yeastForward geneticsHsp90RNAi-dependent heterochromatin assembly

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Yeast Genetics

Background:

  • Heat-shock protein 90 (Hsp90) is implicated in RNA interference (RNAi)-dependent heterochromatin assembly in *Schizosaccharomyces pombe*.
  • Hsp90's known role in small RNA effector complexes suggests involvement in the fission yeast RNAi pathway.

Purpose of the Study:

  • To investigate the precise role of Hsp90 in RNAi-dependent heterochromatin assembly in *Schizosaccharomyces pombe*.
  • To explore methods for identifying novel factors that connect Hsp90 with known RNAi machinery.

Main Methods:

  • Analysis of *hsp90* mutant cells to assess small interfering RNA (siRNA) levels and Hsp90's role in siRNA loading.
  • Examination of RNAi-dependent pericentromeric silencing in fission yeast strains with deleted Hsp90 co-chaperone genes.
  • Discussion of forward genetic screening strategies to uncover new Hsp90-RNAi pathway interactions.

Main Results:

  • Detecting small interfering RNAs in *hsp90* mutant cells proved challenging, hindering direct assessment of Hsp90's role in siRNA loading.
  • Deletion of Hsp90 co-chaperone genes did not appear to impact RNAi-dependent pericentromeric silencing.

Conclusions:

  • The exact mechanism by which Hsp90 modulates RNAi-dependent heterochromatin assembly remains unclear.
  • Forward genetic screens are a promising approach to identify novel factors that bridge Hsp90 and RNAi pathways in *Schizosaccharomyces pombe*.