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Assembly of Nucleosomal Arrays from Recombinant Core Histones and Nucleosome Positioning DNA
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Driving nucleolar assembly.

Kathleen L McCann1, Susan J Baserga

  • 1Department of Genetics.

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|February 5, 2014
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Summary
This summary is machine-generated.

Researchers identified the essential components for building a functional nucleolus in human cells. They also found that upstream binding factor (UBF) acts as a crucial mitotic bookmark at ribosomal DNA (rDNA).

Keywords:
UBFmitotic bookmarkingneo-NORnucleolar organizer region (NOR)nucleoluspseudo-NOR

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The nucleolus is a vital cellular organelle responsible for ribosome biogenesis.
  • Understanding nucleolus assembly and function is crucial for comprehending cell growth and disease.
  • The role of specific factors in maintaining nucleolar structure and function during cell division requires further elucidation.

Purpose of the Study:

  • To determine the minimal molecular constituents necessary for the formation of a functional nucleolus in human cells.
  • To investigate the role of the nucleolar transcription factor upstream binding factor (UBF) during mitosis.
  • To establish UBF's function as a mitotic bookmark at ribosomal DNA (rDNA) loci.

Main Methods:

  • Cellular assays to identify key proteins and factors involved in nucleolus assembly.
  • Live-cell imaging and microscopy to observe nucleolus dynamics during the cell cycle.
  • Chromatin immunoprecipitation (ChIP) to assess UBF binding to rDNA during mitosis.

Main Results:

  • Identification of a core set of proteins sufficient for assembling a functional nucleolus.
  • Demonstration that UBF is essential for maintaining rDNA integrity and accessibility through mitosis.
  • UBF is confirmed to function as a mitotic bookmark, ensuring rapid re-establishment of the nucleolus post-mitosis.

Conclusions:

  • The study defines the fundamental molecular requirements for nucleolus formation in human cells.
  • Upstream binding factor (UBF) plays a critical role as a mitotic bookmark, safeguarding rDNA during cell division.
  • These findings provide new insights into nucleolar organization and its regulation throughout the cell cycle.