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Related Concept Videos

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 Regulation01:37

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...
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Genomic Imprinting and Inheritance

Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Eukaryotic Transcription Inhibitors01:52

Eukaryotic Transcription Inhibitors

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Phase II Reactions: Methylation Reactions01:17

Phase II Reactions: Methylation Reactions

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Mismatch Repair

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Related Experiment Video

Updated: May 28, 2026

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
09:42

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Published on: September 7, 2017

RNA interference in mammalian DNA methylation.

Jeffrey R Mann1, Deidre M Mattiske

  • 1Theme of Genetic Disorders, Murdoch Childrens Research Institute, The Royal Children's Hospital, Parkville 3052, Victoria, Australia. jeff.mann@mcri.edu.au

Biochemistry and Cell Biology = Biochimie Et Biologie Cellulaire
|October 19, 2011
PubMed
Summary

RNA interference (RNAi) plays a role in DNA methylation in mammalian cells. Loss of DICER1 in mouse embryonic stem cells may impair DNA methylation through non-specific RNAi loss effects, not just reduced DNA methyltransferase activity.

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Area of Science:

  • Epigenetics
  • Molecular Biology
  • Genetics

Background:

  • RNA interference (RNAi) and Dicer-dependent small interfering RNAs (siRNAs) are crucial for heterochromatin formation and DNA methylation in various organisms.
  • In mammals, DICER1-independent PIWI-interacting RNAs (piRNAs) are essential for DNA methylation of transposable elements in the male germ line.
  • The role of RNAi in establishing heterochromatin and DNA methylation in other mammalian cell types remains unclear.

Purpose of the Study:

  • To investigate the role of RNAi in heterochromatin formation and DNA methylation in mouse embryonic stem cells.
  • To determine if DICER1 deficiency and subsequent RNAi loss impact DNA methylation through reduced DNA methyltransferase (DNMT) activity or other mechanisms.

Main Methods:

  • Analysis of DICER1-deficient mouse embryonic stem cells.
  • Assessment of heterochromatin formation.
  • Evaluation of DNA methylation patterns and DNA methyltransferase (DNMT) activity.

Main Results:

  • Mouse embryonic stem cells lacking DICER1 and RNAi remain viable.
  • No definitive evidence of defective heterochromatin formation was observed.
  • Indications of defective DNA methylation were present, potentially linked to reduced DNMT activity via miRNA regulation, but alternative non-specific RNAi loss effects are also considered likely.

Conclusions:

  • The precise role of RNAi in establishing heterochromatin and DNA methylation in mammalian somatic cells requires further investigation.
  • Defects in DNA methylation in DICER1-deficient mouse embryonic stem cells may arise from non-specific consequences of RNAi loss, independent of reduced DNMT activity.
  • The findings suggest a complex interplay between RNAi pathways and epigenetic regulation in mammalian development.