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Related Concept Videos

Position-effect Variegation02:32

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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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.
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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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An Ecdysone Receptor-based Singular Gene Switch for Deliberate Expression of Transgene with Robustness, Reversibility, and Negligible Leakiness
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Toggle switch: noise determines the winning gene.

Joanna Jaruszewicz1, Tomasz Lipniacki

  • 1Institute of Fundamental Technological Research, Polish Academy of Sciences, 02-106 Warsaw, Poland.

Physical Biology
|June 6, 2013
PubMed
Summary

Noise characteristics in bistable genetic switches determine cell fate. Different noise types, like gene switching and protein dimerization noise, can either promote or suppress gene activation, influencing epigenetic attractor stability.

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Area of Science:

  • Systems Biology
  • Molecular Biology
  • Genetics

Background:

  • Bistable regulatory elements drive cell population heterogeneity and fate specification in multicellular organisms.
  • Understanding noise in genetic switches is crucial for cell specialization.

Purpose of the Study:

  • To investigate how noise characteristics influence epigenetic attractor selection in bistable genetic switch systems.
  • To analyze the impact of gene switching noise and protein dimerization noise on cell fate decisions.

Main Methods:

  • Modeling of a bistable genetic switch system.
  • Analysis of noise components: gene switching noise and protein dimerization noise.
  • Simulation of protein stationary probability distribution and gene activation probabilities.

Main Results:

  • Noise magnitude changes create asymmetry in protein distribution and alter gene activation probabilities.
  • Gene switching noise represses gene activation, while protein dimerization noise promotes it.
  • Effects remain robust despite significant model parameter variations.

Conclusions:

  • Noise characteristics can dictate the relative strength of epigenetic attractors.
  • Noise offers a novel mechanism for controlling cell fate decisions in biological systems.