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Related Concept Videos

Combinatorial Gene Control02:33

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...
Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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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...
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.

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Related Experiment Video

Updated: Jun 1, 2026

Investigating Interactions Between Histone Modifying Enzymes and Transcription Factors in vivo by Fluorescence Resonance Energy Transfer
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Polycomb-group mediated epigenetic mechanisms through plant evolution.

Yana Butenko1, Nir Ohad

  • 1Department of Molecular Biology and Ecology of Plants, Tel-Aviv University, Israel.

Biochimica Et Biophysica Acta
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

Polycomb Group (PcG) proteins are epigenetic regulators conserved across plants and animals. This review details the evolution and function of PcG gene families in diverse plant lineages, highlighting their roles in development.

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Area of Science:

  • Plant biology
  • Epigenetics
  • Evolutionary biology

Background:

  • Polycomb Group (PcG) proteins function as epigenetic regulators, establishing cellular memory through histone modifications to control gene expression.
  • While PcG protein roles in Arabidopsis thaliana are well-documented, research in other terrestrial plants is a recent development.
  • Understanding PcG machinery across diverse plant groups is crucial for comprehending plant development.

Purpose of the Study:

  • To review recent findings on the evolution and diversification of PcG mechanisms in plants.
  • To explore the composition and expression of PcG gene families in various plant phyla.
  • To compare PcG functions across different plant species, from algae to flowering plants.

Main Methods:

  • Literature review of recent research on PcG proteins in plants.
  • Comparative analysis of PcG gene family composition and expression profiles.
  • Synthesis of data on PcG functions across diverse plant lineages.

Main Results:

  • PcG proteins are conserved epigenetic regulators in plants, playing vital roles in development.
  • PcG gene families exhibit diversification across plant phyla, from early-diverging algae to flowering plants.
  • Comparative analysis reveals both conserved and divergent aspects of PcG functions in plants.

Conclusions:

  • PcG proteins are essential epigenetic components in plant development, with a conserved core machinery.
  • The evolution of PcG systems in plants shows diversification, reflecting adaptation to different lineages.
  • Further research into PcG mechanisms across diverse plant species will enhance our understanding of epigenetic control in plants.