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Related Concept Videos

Epigenetic Regulation01:37

Epigenetic Regulation

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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...
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Inheritance of Chromatin Structures03:17

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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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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.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Related Experiment Video

Updated: Apr 14, 2026

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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DNA methylation, its mediators and genome integrity.

Huan Meng1, Ying Cao2, Jinzhong Qin2

  • 11. Key Laboratory of Medical Cell Biology, Ministry of Education, China Medical University, Shenyang 110001, China; ; 2. MOE Key Laboratory of Model Animal for Disease Study, Model Animal Research Center, Nanjing Biomedical Research Institute, Nanjing University, China.

International Journal of Biological Sciences
|April 21, 2015
PubMed
Summary

DNA methylation, regulated by enzymes like DNA methyltransferases and TETs, is crucial for cellular processes. Aberrant DNA methylation can lead to cancer by affecting gene expression and genome stability.

Keywords:
BRCA1DNA glycosylasesDNA methylationDNA methyltransferasesgenome instability.methyl-CpG binding proteins

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Area of Science:

  • Epigenetics and Molecular Biology
  • Cancer Genomics
  • Cellular Regulation

Background:

  • DNA methylation is a key epigenetic mechanism controlling essential cellular processes like development, transcription, and genome stability.
  • Enzymes such as DNA methyltransferases (DNMTs) and ten-eleven translocation (TET) dioxygenases mediate DNA methylation and its oxidative derivatives (5hmC, 5fC, 5caC).
  • Methyl-CpG binding proteins (MeCPs) interpret these epigenetic marks, influencing transcriptional regulation, DNA repair, and replication.

Purpose of the Study:

  • To elucidate the critical roles of DNA methylation and its mediators in maintaining cellular functions and genome stability.
  • To highlight the consequences of defects in DNA methylation pathways, including gene silencing and cell cycle dysregulation.
  • To emphasize the importance of understanding genetic mutations and aberrant expression of DNA methylation mediators in cancer development and therapeutic strategies.

Main Methods:

  • Review of established literature on DNA methylation pathways and their regulatory proteins.
  • Analysis of the functional impact of DNA methyltransferases, TET enzymes, and MeCPs.
  • Examination of the link between epigenetic alterations and genome instability in human diseases, particularly cancer.

Main Results:

  • DNA methylation is fundamental to embryonic development, transcription, chromatin structure, X-chromosome inactivation, genomic imprinting, and chromosome stability.
  • TET enzymes convert 5-methylcytosine (5mC) to downstream oxidized forms, which can be processed by base excision repair (BER).
  • Dysregulation of DNA methylation mediators can silence tumor suppressor genes and disrupt cell cycle, DNA repair, and chromosome stability, contributing to cancer.

Conclusions:

  • Understanding the interplay between genetic mutations and epigenetic dysregulation in DNA methylation is vital for cancer research.
  • Aberrant DNA methylation patterns and mediator dysfunction are implicated in genome instability and human diseases like cancer.
  • Investigating these epigenetic alterations is critical for developing novel therapeutic strategies targeting specific cancer types.