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Related Concept Videos

Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

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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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Inheritance of Chromatin Structures03:17

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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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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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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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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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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Brain function and chromatin plasticity.

Catherine Dulac1

  • 1Howard Hughes Medical Institute, Harvard University, 16 Divinity Avenue, Cambridge, Massachusetts 02138, USA. dulac@fas.harvard.edu

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Summary
This summary is machine-generated.

Epigenetic control offers lasting gene expression changes crucial for neurons. Understanding these persistent chromatin modifications aids in studying brain function and diseases.

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Area of Science:

  • Neuroscience
  • Epigenetics
  • Chromatin Biology

Background:

  • Epigenetic mechanisms provide stable gene expression changes beyond initial stimuli.
  • Post-mitotic neurons require stable regulatory processes to adapt to changing influences on activity and connectivity.
  • Persistent chromatin structure alterations are implicated in epigenetic inheritance.

Purpose of the Study:

  • To explore the significance of epigenetic control in post-mitotic neurons.
  • To investigate how epigenetic mechanisms contribute to long-lasting neuronal changes.
  • To leverage advances in chromatin biology for understanding neuronal regulation.

Main Methods:

  • Investigating epigenetic control mechanisms in neuronal systems.
  • Analyzing persistent changes in chromatin structure.
  • Utilizing recent advances in chromatin biology research.

Main Results:

  • Epigenetic control offers stable, long-lasting effects on gene expression in neurons.
  • Chromatin structure modifications are key to enduring neuronal changes.
  • These mechanisms are vital for neuronal activity and connectivity.

Conclusions:

  • Epigenetic regulation is critical for maintaining neuronal function and adaptability.
  • Understanding these processes has significant implications for brain function, behavior, and neurological diseases.
  • Further research into chromatin biology will illuminate neuronal regulatory mechanisms.