Cancer epigenomics: DNA methylomes and histone-modification maps

Manel Esteller1

  • 1Cancer Epigenetics Laboratory, Spanish National Cancer Centre (CNIO), Melchor Fernandez Almagro 3, 28029 Madrid, Spain. mesteller@cnio.es

Insights

Epigenetic modifications play a key role in cancer development. Genome-wide epigenomics approaches are essential for understanding cancer epigenetics and developing new treatments.

Area of Science:

  • Oncology
  • Epigenetics
  • Genomics

Background:

  • Altered epigenetic modifications are fundamental to numerous human diseases, particularly cancer.
  • Previous research focused on gene-specific DNA methylation and histone modification patterns in cancer cells.
  • CpG-island-promoter hypermethylation was identified as a key mechanism for tumor suppressor gene silencing.

Purpose of the Study:

  • To highlight the importance of genome-wide epigenomics in cancer research.
  • To advocate for an ambitious research plan to address outstanding questions in cancer epigenetics.
  • To leverage recent technological advancements for a comprehensive understanding of cancer epigenetics.

Main Methods:

  • Review of existing studies on DNA methylation and histone modification in cancer.
  • Emphasis on the shift from gene-by-gene analysis to genome-wide epigenomics.
  • Utilizing advanced epigenomics technologies for large-scale analysis.

Main Results:

  • Genome-wide approaches are revealing complex epigenetic patterns in cancer.
  • These advanced methods offer significant biological insights into cancer development.
  • New translational research avenues are emerging from epigenomics studies.

Conclusions:

  • Cancer epigenetics research requires an upgrade to a genome-wide epigenomics perspective.
  • An ambitious, coordinated plan is needed to tackle complex questions in the field.
  • Epigenomics holds the key to deeper understanding and improved therapeutic strategies for cancer.

Related Concept Videos

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.
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,...
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...