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Related Experiment Videos

Histone H1 subtype-specific consensus elements mediate cell cycle-regulated transcription in vitro.

F La Bella1, P Gallinari, J McKinney

  • 1Howard Hughes Medical Institute, Rockefeller University, New York, New York 10021.

Genes & Development
|December 1, 1989
PubMed
Summary

Histone H1 gene transcription is regulated during the cell cycle. Specific transcription factors, like H1TF2, are crucial for activating H1 gene expression as cells enter S phase.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Histone H1 proteins are essential for chromatin structure and play a role in cell cycle regulation.
  • Understanding the transcriptional control of histone gene expression is critical for comprehending cell cycle progression.

Purpose of the Study:

  • To investigate the transcriptional regulation of histone H1 during the mammalian cell cycle.
  • To identify the specific transcription factors involved in the S-phase-dependent expression of histone H1 genes.

Main Methods:

  • Utilized nuclear extracts from centrifugally elutriated cell populations.
  • Analyzed mutations within the H1 promoter to assess the function of subtype-specific consensus elements.
  • Measured DNA binding activity of transcription factors (H1TF2, H1TF1, OTF1) in nuclear extracts from different cell cycle phases.

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Main Results:

  • Both H1 proximal and distal subtype-specific elements in the H1 promoter are involved in transcriptional induction at the G1 to S phase transition.
  • DNA binding activity of H1TF2 significantly increases in S-phase nuclear extracts.
  • No significant change in DNA binding was observed for H1TF1 or OTF1 during the G1 to S phase transition.

Conclusions:

  • Histone gene subtype-specific transcription factors are critical for the S-phase-dependent expression of histone genes.
  • H1TF2 plays a key role in the transcriptional activation of histone H1 genes upon entry into S phase.
  • Further research on these factors will enhance understanding of the G1 to S phase transition in the cell cycle.