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Purification of H3 and H4 Histone Proteins and the Quantification of Acetylated Histone Marks in Cells and Brain Tissue
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Hormone-mediated dephosphorylation of specific histone H1 isoforms

G C Banks1, L J Deterding, K B Tomer

  • 1Laboratories of Reproductive and Developmental Toxicology, NIEHS, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA.

The Journal of Biological Chemistry
|August 2, 2001
PubMed

Insights

Hormone treatment dephosphorylates specific histone H1 isoforms, impacting gene transcription. This suggests targeted histone modifications control gene activation and repression, offering insights into chromatin structure and gene regulation.

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Gene Regulation

Background:

  • Histone H1 phosphorylation is linked to the transcriptional competence of the mouse mammary tumor virus (MMTV) promoter.
  • Prolonged dexamethasone exposure dephosphorylates histone H1 and makes the MMTV promoter transcriptionally unresponsive.

Purpose of the Study:

  • To investigate the differential effects of prolonged dexamethasone treatment on specific histone H1 isoforms.
  • To explore the role of histone H1 isoform dephosphorylation in regulating MMTV promoter activity.

Main Methods:

  • Electrospray mass spectrometry was used to analyze histone H1 isoform phosphorylation.
  • Cultured mouse cells were treated with dexamethasone and the protein kinase inhibitor staurosporine.

Main Results:

  • Prolonged dexamethasone treatment differentially dephosphorylated H1 isoforms: H1.3, H1.4, and H1.5 were affected, while H1.0, H1.1, and H1.2 were not.
  • Staurosporine completely dephosphorylated the H1.3 isoform.
  • Dephosphorylation of specific H1 isoforms correlates with decreased MMTV promoter transcriptional competence.

Conclusions:

  • Dephosphorylation of specific histone H1 isoforms contributes to reduced MMTV promoter activity by modulating chromatin structure.
  • Post-translational modifications of individual histone H1 isoforms are hypothesized to directly influence the transcriptional regulation of specific genes.

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