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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Satellite DNA-Mediated Gene Expression Regulation: Physiological and Evolutionary Implication.

Isidoro Feliciello1,2, Željka Pezer1, Antonio Sermek1

  • 1Department of Molecular Biology, Ruđer Bošković Institute, Zagreb, Croatia.

Progress in Molecular and Subcellular Biology
|August 13, 2021
PubMed
Summary

Satellite DNAs, found in euchromatin, can epigenetically silence genes, impacting development and stress response. This gene modulation by satellite DNA plays a role in genome evolution and adaptation.

Keywords:
EmbryogenesisEuchromatinGene expressionHeat stressHeterochromatinSatellite DNA

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Area of Science:

  • Genomics
  • Epigenetics
  • Molecular Biology

Background:

  • Satellite DNAs are repetitive DNA sequences found in heterochromatin and euchromatin.
  • Euchromatic satellite DNA arrays are transcriptionally active.
  • Gene modulation by satellite DNA was first observed in Tribolium castaneum under heat stress.

Purpose of the Study:

  • To investigate the gene-modulatory effects of satellite DNAs.
  • To understand the role of satellite DNA transcription in physiological processes and evolution.

Main Methods:

  • Analysis of satellite DNA organization and transcriptional activity.
  • Epigenetic modification studies (histone marks).
  • Gene silencing assays in response to stress and during embryonic development.

Main Results:

  • Euchromatic satellite DNA repeats, when epigenetically marked, silence neighboring genes.
  • Satellite DNA transcription is induced by heat shock in humans and mosquitoes, mediating gene silencing.
  • Satellite RNA-mediated gene silencing is crucial for embryonic development in Aedes aegypti.

Conclusions:

  • Satellite DNAs possess gene-modulatory functions with roles in stress response and embryonic development.
  • The spread and transcription of satellite DNAs influence epigenetic landscapes and gene expression diversity.
  • Satellite DNA activity contributes to genome adaptation and the evolution of gene regulatory networks.