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Related Concept Videos

Chromatin Immunoprecipitation- ChIP02:36

Chromatin Immunoprecipitation- ChIP

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Chromatin immunoprecipitation, or ChIP, is an antibody-based technique used to identify sites on DNA that bind to transcription factors of interest or histone proteins. It also helps determine the type of histone modifications such as acetylation, phosphorylation, or methylation.
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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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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.
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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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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
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Interrogating epigenetic mechanisms with chemically customized chromatin.

Nir Hananya1, Shany Koren1, Tom W Muir2

  • 1Department of Chemistry, Princeton University, Princeton, NJ, USA.

Nature Reviews. Genetics
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Summary

This review highlights how protein engineering creates designer chromatin, complementing genomics, to understand epigenetic regulation and molecular interactions with DNA. These advanced tools help unravel complex chromatin mechanisms.

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Area of Science:

  • Epigenetics and Chromatin Biology
  • Molecular and Biochemical Mechanisms
  • Genomics and Proteomics

Background:

  • Genetic and genomic techniques are powerful for identifying epigenetic regulators of DNA-templated processes like transcription.
  • Understanding the mechanistic details of molecular interactions with chromatin remains challenging due to complex biochemical networks.

Purpose of the Study:

  • To review how protein engineering advances complement established 'omics' techniques.
  • To address fundamental questions in chromatin regulation, specifically chromatin mark establishment and protein-chromatin interactions.

Main Methods:

  • Utilizing protein engineering to reconstitute 'designer' chromatin with customized post-translational modification patterns.
  • Employing sophisticated biochemical and biophysical methods alongside designer chromatin.
  • Integrating these approaches with established genomics and proteomics ('omics') techniques.

Main Results:

  • Designer chromatin allows for the direct investigation of mechanistic questions previously difficult to address.
  • These tools enable a deeper understanding of how specific chromatin modifications are established.
  • Facilitates detailed analysis of protein-chromatin interactions and their functional consequences.

Conclusions:

  • Protein engineering and designer chromatin offer powerful complementary approaches to traditional 'omics' methods.
  • These integrated strategies are crucial for deciphering the complex molecular mechanisms of chromatin regulation.
  • Essential for advancing our knowledge of epigenetic mark dynamics and protein-DNA interactions.