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Related Experiment Videos

Genomic characterization reveals a simple histone H4 acetylation code.

Michael F Dion1, Steven J Altschuler, Lani F Wu

  • 1Bauer Center for Genomics Research, Harvard University, 7 Divinity Avenue, Cambridge, MA 02138, USA.

Proceedings of the National Academy of Sciences of the United States of America
|March 30, 2005
PubMed
Summary
This summary is machine-generated.

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Histone acetylation patterns on histone H4 tails are interpreted through distinct mechanisms. Lysine 16 has specific effects on gene expression, while lysines 5, 8, and 12 exhibit cumulative, non-specific impacts.

Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • The histone code hypothesis proposes that post-translational modifications on histone tails regulate gene transcription.
  • Histone acetylation, a key modification, involves lysine residues and is crucial for transcriptional control.
  • The combinatorial nature of histone acetylation and its precise role remain areas of active research.

Purpose of the Study:

  • To investigate the combinatorial complexity of histone H4 acetylation at specific lysine residues (K5, K8, K12, K16) in budding yeast.
  • To determine how different combinations of acetylation states at these lysines influence genome-wide gene expression.
  • To elucidate the mechanisms by which histone H4 acetylation is interpreted by the cell.

Main Methods:

  • Construction of yeast strains with all 15 possible combinations of mutations from lysines 5, 8, 12, and 16 to arginine.

Related Experiment Videos

  • Mimicking unacetylated, positively charged lysine states through site-directed mutagenesis.
  • Genome-wide gene expression analysis using DNA microarrays.

    • Main Results:

    • Mutation at lysine 16 (H4K16) specifically altered the expression of approximately 100 genes, independent of other lysine states.
    • Mutations at lysines 5, 8, and 12 resulted in non-specific, cumulative effects on gene expression, impacting around 1,200 genes.
    • Increased numbers of mutations at K5, K8, and K12 correlated with increased transcription, suggesting a cumulative mechanism.

    Conclusions:

    • Histone H4 acetylation is interpreted via two distinct mechanisms: a specific regulatory role for K16 and a non-specific, cumulative role for K5, K8, and K12.
    • This study clarifies the differential functional significance of lysine acetylation sites on the histone H4 tail.
    • Findings contribute to understanding the complexity of the histone code and its impact on transcriptional regulation.