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Related Concept Videos

Transcription Factors02:16

Transcription Factors

75.6K
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...
75.6K
General Transcription Factors01:30

General Transcription Factors

5.1K
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...
5.1K
Transcription01:10

Transcription

146.4K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
146.4K
Transcription Elongation Factors02:35

Transcription Elongation Factors

10.7K
Transcription elongation is a dynamic process that alters depending upon the sequence heterogeneity of the DNA being transcribed. Hence, it is not surprising that the elongation complex's composition also varies along the way while transcribing a gene.
The transcription elongation is regulated via pausing of RNA polymerase on several occasions during transcription. In bacteria, these halts are necessary because the transcription of DNA into mRNA is coupled to the translation of that mRNA...
10.7K
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

9.1K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
9.1K
Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

22.4K
Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
22.4K

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Rethinking transcription factor dynamics and transcription regulation in eukaryotes.

Reiner A Veitia1

  • 1Université Paris Cité, Centre National de la Recherche Scientifique (CNRS), Institut Jacques Monod, F-75006, Paris, France; Université Paris-Saclay, Institut de Biologie François Jacob, Commissariat à l'Énergie Atomique, Fontenay-aux-Roses, France.

Trends in Biochemical Sciences
|March 5, 2025
PubMed
Summary

Transcription factors (TFs) achieve gene expression specificity through synergy, not just cooperativity. Nuclear condensate concentration and covalent modifications further refine these responses.

Keywords:
phase separationpost-translational modificationstranscription factors (TFs)transcription regulationtranscriptional condensate

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transcription factors (TFs) bind DNA motifs to regulate gene expression.
  • Cooperativity among TFs was traditionally considered key for binding specificity.
  • Recent findings question the overemphasis on cooperativity in yeast models.

Purpose of the Study:

  • To re-evaluate the mechanisms governing TF binding specificity.
  • To highlight the significance of synergy in transcriptional regulation.
  • To explore the roles of nuclear condensates and covalent modifications in fine-tuning gene expression.

Main Methods:

  • Review and synthesis of recent research findings.
  • Theoretical modeling integrating multiple regulatory mechanisms.
  • Analysis of TF behavior in eukaryotic systems.

Main Results:

  • Synergy, the collective recruitment of transcriptional machinery, is a more critical mechanism for specificity than previously thought.
  • TF concentration within phase-separated nuclear condensates enhances specificity.
  • Covalent modifications of TFs also contribute to sharpening transcriptional responses.

Conclusions:

  • The traditional view of cooperativity in TF binding specificity may be overstated.
  • Synergy, nuclear condensate formation, and post-translational modifications are crucial for precise transcriptional control.
  • A comprehensive model incorporating these factors explains dynamic, context-specific gene expression in eukaryotes.