Chromatin remodeling and cancer

Penny K Davis1, Rainer K Brackmann

  • 1Division of Hematology/Oncology, Department of Medicine, University of California at Irvine, Irvine, California 92697, USA. pkdavis@ud.edu

Insights

Chromatin remodeling proteins control gene expression by altering DNA accessibility. Genetic alterations in these proteins are linked to human cancers, suggesting new therapeutic strategies.

Area of Science:

  • Molecular Biology
  • Epigenetics
  • Cancer Biology

Background:

  • Cellular function depends on precise gene expression and repression.
  • Transcriptional control involves transcription factors and chromatin remodeling proteins.
  • Chromatin remodeling proteins regulate gene accessibility by modifying nucleosome architecture.

Purpose of the Study:

  • To provide an overview of chromatin remodeling.
  • To describe genetic alterations in chromatin remodeling proteins in human cancers.
  • To explore potential cancer manipulation of chromatin remodeling machinery.

Main Methods:

  • Review of existing literature on chromatin remodeling.
  • Analysis of genetic alterations in chromatin remodeling proteins.
  • Discussion of cancer's potential strategies for manipulating chromatin remodeling.

Main Results:

  • Chromatin remodeling proteins are crucial for transcriptional regulation.
  • Known genetic alterations of these proteins are implicated in human cancers.
  • Cancers may employ various strategies to exploit the chromatin remodeling machinery.

Conclusions:

  • Chromatin remodeling is fundamental to cellular processes and cancer development.
  • Understanding genetic alterations in these proteins is key to cancer research.
  • Further exploration of cancer's manipulation of chromatin remodeling may reveal novel therapeutic targets.

Related Concept Videos

Nucleosome Remodeling02:54

Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...
Chromatin Modification in iPS Cells01:32

Chromatin Modification in iPS Cells

Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
Compact chromatin makes reprogramming difficult. Enzymes, such as histone demethylases and acetyltransferases, are often added during reprogramming to loosen the chromatin, making the DNA more accessible to transcription factors. Molecules that inhibit histone...
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...
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.
Chromatin Position Affects Gene Expression02:35

Chromatin Position Affects Gene Expression

Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
Topologically Associated Domains (TADs)
The 3-dimensional positioning of chromatin in the nucleus influences the timing and level of...