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General Transcription Factors01:30

General Transcription Factors

5.2K
Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Conservative Site-specific Recombination and Phase Variation02:53

Conservative Site-specific Recombination and Phase Variation

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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
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Transcription Factors02:16

Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
75.7K
Combinatorial Gene Control02:33

Combinatorial Gene Control

8.3K
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...
8.3K
Position-effect Variegation02:32

Position-effect Variegation

6.3K
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.
6.3K
Transcription Attenuation in Prokaryotes02:42

Transcription Attenuation in Prokaryotes

15.2K
Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
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Related Experiment Video

Updated: Jun 9, 2025

Author Spotlight: Evaluation of Protein-Condensate Dynamics in Live Human Cells
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Emerging links between phase separation and transcription factor haploinsufficiency.

Reiner A Veitia1

  • 1Université Paris Cité, CNRS, Institut Jacques Monod, F-75006, Paris, France; Université Paris-Saclay, Institut de Biologie François Jacob, Commissariat à l'Energie Atomique, Fontenay aux Roses, France.

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|October 27, 2024
PubMed
Summary

Nuclear phase separation is crucial for understanding genetic variants. New findings reveal unexpected connections between this process and the haploinsufficiency of transcription factors.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Membrane-less compartments form in the nucleus via phase separation.
  • Understanding the impact of genetic variants is an active area of research.

Purpose of the Study:

  • To investigate the role of nuclear phase separation in the context of genetic variants.
  • To explore potential links between phase separation and transcription factor function.

Main Methods:

  • Literature review of recent studies on nuclear phase separation.
  • Analysis of genetic variant data and transcription factor behavior.

Main Results:

  • Phase separation is relevant for understanding genetic variant impacts.
  • Unsuspected links identified between phase separation and transcription factor haploinsufficiency.

Conclusions:

  • Nuclear phase separation plays a significant role in the cellular response to genetic variation.
  • Haploinsufficiency of transcription factors may be influenced by phase separation dynamics.