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Related Experiment Videos

Transcription through chromatin: understanding a complex FACT.

Rimma Belotserkovskaya1, Abbie Saunders, John T Lis

  • 1Howard Hughes Medical Institute, Department of Biochemistry, Division of Nucleic Acids Enzymology, University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, 663 Hoes Lane, SRB, Piscataway, NJ 08854-5635, USA.

Biochimica Et Biophysica Acta
|March 17, 2004
PubMed
Summary

Chromatin remodeling is crucial for DNA accessibility. The FACT complex facilitates RNA polymerase II transcription through nucleosomes by managing histone removal, aiding gene expression.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genetics

Background:

  • Genomic DNA in eukaryotic cells is packaged into chromatin, a compact structure primarily composed of histones.
  • Chromatin accessibility is vital for DNA-dependent processes like transcription, replication, recombination, and repair.
  • Active transcription sites exhibit altered chromatin structure, often with depleted histone H2A/H2B dimers in nucleosomes.

Purpose of the Study:

  • To review the initial identification and characterization of the FACT complex.
  • To present recent findings refining the mechanism of FACT's function in transcription.
  • To elucidate how FACT facilitates RNA polymerase II transcription through nucleosomes.

Main Methods:

  • Reconstitution of RNA polymerase II-driven transcription on purified chromatin templates in vitro.

Related Experiment Videos

  • Biochemical assays to study the interaction of FACT with chromatin and its role in transcription elongation.
  • Review and integration of previous and recent experimental data on FACT function.

    • Main Results:

    • FACT (facilitates chromatin transcription) was identified as essential for productive transcript elongation through nucleosomes.
    • FACT is proposed to promote transcription by removing H2A/H2B dimers from nucleosomes.
    • Recent studies provide refined models for FACT's mechanism in transcription through chromatin.

    Conclusions:

    • Dynamic chromatin remodeling is essential for regulating DNA-templated processes.
    • The FACT complex plays a key role in overcoming nucleosomal barriers during transcription.
    • Understanding FACT's mechanism offers insights into gene regulation and chromatin dynamics.