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Related Concept Videos

Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...

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A Caenorhabditis elegans Model System for Amylopathy Study
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Neurospora crassa, a model system for epigenetics research.

Rodolfo Aramayo1, Eric U Selker

  • 1Department of Biology, Texas A&M University, College Station, Texas 77843-3258.

Cold Spring Harbor Perspectives in Biology
|October 3, 2013
PubMed
Summary

Neurospora crassa offers unique insights into epigenetic phenomena and gene silencing. This fungus exhibits distinct mechanisms like repeat-induced point mutation (RIP) and RNA interference (RNAi)-based quelling and meiotic silencing.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Mycology

Background:

  • Neurospora crassa possesses eukaryotic features absent in yeast, facilitating epigenetic studies.
  • It exhibits DNA methylation and H3K27 methylation, crucial epigenetic marks.
  • Distinct RNA interference (RNAi)-based silencing mechanisms operate in different cell cycle stages.

Purpose of the Study:

  • To explore the unique epigenetic phenomena in Neurospora crassa.
  • To investigate the distinct gene silencing mechanisms present in this model organism.
  • To understand the role of RNAi in both mitotic and meiotic processes.

Main Methods:

  • Comparative genomics and molecular analyses.
  • Epigenetic modification assays (e.g., methylation analysis).
  • RNA interference pathway characterization.

Main Results:

  • Identification of repeat-induced point mutation (RIP) as a homology-based genome defense system.
  • Characterization of quelling, an RNAi-based silencing of transgenes and homologs.
  • Description of meiotic silencing, a distinct RNAi-based process active during meiosis.

Conclusions:

  • Neurospora crassa is a powerful model for studying diverse epigenetic mechanisms.
  • RIP, quelling, and meiotic silencing represent key gene regulation strategies.
  • RNAi plays multifaceted roles in gene silencing throughout the life cycle of N. crassa.