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Related Concept Videos

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...
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Transcription Factors02:16

Transcription Factors

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General Transcription Factors01:30

General 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...
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Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form...
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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...
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Related Experiment Video

Updated: Mar 21, 2026

Author Spotlight: An Integrated Workflow to Study the Promoter-Centric Spatio-Temporal Genome Architecture in Scarce Cell Populations
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Unstructured transcription factor interactions enable emergent specificity.

Abrar A Abidi1,2, Claudia Cattoglio1,2, Natalie N Tang1

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, USA.

Science (New York, N.Y.)
|March 19, 2026
PubMed
Summary
This summary is machine-generated.

Intrinsically disordered regions (IDRs) can confer specific DNA binding to transcription factors (TFs). These interactions scaffold TF specificity on chromatin through transient DNA contacts.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biophysics

Background:

  • The role of intrinsically disordered regions (IDRs) in transcription factor (TF) binding and nuclear organization is not well understood.
  • Investigating how IDRs affect TF interactions with chromatin and other TFs is crucial for understanding gene regulation.

Purpose of the Study:

  • To explore the influence of IDRs on the chromatin binding and nuclear organization of transcription factors.
  • To elucidate the mechanisms by which IDRs contribute to TF specificity in live cells.

Main Methods:

  • Proximity-assisted photoactivation (PAPA), a single-molecule sensor, was utilized to study protein-protein interactions in live cells.
  • Live imaging of *Drosophila* polytene chromosomes was performed to observe TF-chromatin interactions.

Main Results:

  • The Sp1 DNA binding domain (DBD) showed poor chromatin interaction and did not colocalize with Sp1.
  • Fusion of IDRs to unrelated DBDs enhanced weak interactions with full-length Sp1.
  • IDRs conferred locus specificity to a nonspecific DBD on *Drosophila* polytene chromosomes.

Conclusions:

  • TF specificity arises on chromatin through the scaffolding of unstructured interactions by transient DNA contacts.
  • IDRs play a significant role in modulating TF interactions with chromatin and conferring locus specificity.