Wellcome Trust Award Lecture. Chromatin-modifying enzymes in transcription and cancer

T Kouzarides1

  • 1Wellcome Trust/Cancer Research UK Institute, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QR, UK. tk106@mole.bio.ca.ac.uk

Insights

Enzymes modifying histones drive gene transcription, influencing cell proliferation pathways. Deregulation of these chromatin-modifying enzymes in cancer offers potential drug targets.

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Biochemistry

Background:

  • Gene expression control has evolved, revealing transcription as an enzymatically driven process.
  • Histone-modifying enzymes play a crucial role in regulating gene transcription.
  • These enzymes mediate chromatin changes, impacting transcription positively or negatively.

Discussion:

  • Cell proliferation pathways are regulated by chromatin-modifying enzymes.
  • Aberrant activity of these enzymes is observed in various cancers.
  • Understanding these enzymes is key to deciphering cancer biology.

Key Insights:

  • Histone modifications are central to gene expression regulation.
  • Enzymatic control of transcription is a fundamental biological mechanism.
  • Chromatin-modifying enzymes link cellular processes to disease.

Outlook:

  • Chromatin-modifying enzymes represent promising targets for novel cancer therapeutics.
  • Drug discovery efforts are focusing on these enzymes for therapeutic intervention.
  • Targeting epigenetic modifications could revolutionize cancer treatment.

Related Concept Videos

Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.