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RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Chromatin Isolation by RNA Purification (ChIRP)
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Published on: March 25, 2012

Noncoding RNA and Polycomb recruitment.

Neil Brockdorff1

  • 1Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK. neil.brockdorff@bioch.ox.ac.uk

RNA (New York, N.Y.)
|February 23, 2013
PubMed
Summary
This summary is machine-generated.

Noncoding RNAs (ncRNAs) can silence genes, with Xist RNA being a key example in X chromosome inactivation. This review examines the evidence for and against direct interactions between ncRNAs and Polycomb repressive complex PRC2 in gene silencing.

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A Method to Study de novo Formation of Chromatin Domains
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Area of Science:

  • Epigenetics and Gene Regulation
  • Molecular Biology
  • RNA Biology

Background:

  • High-throughput transcriptome analysis has revealed numerous noncoding RNAs (ncRNAs).
  • A significant class of functional ncRNAs is involved in coordinating gene silencing.
  • The long ncRNA Xist is a primary example, mediating cis-acting silencing for X chromosome inactivation in female mammals.

Purpose of the Study:

  • To review the evidence for and against direct interactions between ncRNAs and Polycomb repressive complex 2 (PRC2).
  • To explore alternative models for ncRNA-mediated gene silencing.
  • To identify future experiments for resolving discrepancies in the field.

Main Methods:

  • Literature review and critical analysis of existing studies.
  • Examination of experimental evidence supporting and refuting direct ncRNA-PRC2 interactions.
  • Discussion of proposed mechanisms and alternative models.

Main Results:

  • Xist RNA's role in recruiting PRC2 for X chromosome inactivation is well-established.
  • Evidence suggests direct interactions between various ncRNAs and PRC2 for targeted gene silencing.
  • Alternative models and ongoing research highlight complexities beyond direct binding.

Conclusions:

  • The direct interaction model between ncRNAs and PRC2 is debated.
  • Further experimental validation is required to elucidate the precise mechanisms of ncRNA-mediated gene silencing.
  • Understanding these interactions is crucial for comprehending epigenetic regulation.