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Transcription Factors

Transcription Factors

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...

Transcription Factors

Transcription Factors

Conserved Binding Sites

Conserved Binding Sites

Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...

Conserved Binding Sites

Conserved Binding Sites

Cooperative Binding of Transcription Regulators

Cooperative Binding of Transcription Regulators

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...

Cooperative Binding of Transcription Regulators

Cooperative Binding of Transcription Regulators

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Updated: Mar 24, 2026

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy

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The Soft Touch: Low-Affinity Transcription Factor Binding Sites in Development and Evolution.

Justin Crocker¹, Ella Preger-Ben Noon¹, David L Stern¹

¹Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, Virginia, USA.

Current Topics in Developmental Biology

|March 13, 2016

Summary

Transcription factors use low-affinity DNA binding sites, not just high-affinity ones, to regulate genes. This finding is crucial for understanding gene regulation, development, and evolution.

Keywords:

Enhancer Low-affinity binding sites Protein–DNA interaction Transcription factor Transcription regulation cis-Regulatory element

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Area of Science:

Molecular Biology
Genetics
Developmental Biology

Background:

Transcription factor (TF) proteins bind specific DNA regions to control gene expression.
Research has predominantly focused on high-affinity TF binding sites.
Evidence suggests that sites with varying affinities, including low-affinity ones, play a vital role in gene regulation.

Purpose of the Study:

To present theoretical and experimental evidence for the significance of low-affinity TF binding sites.
To explore the implications of low-affinity sites in eukaryotic genomes for gene regulation.

Main Methods:

Theoretical modeling of TF-DNA interactions.
Experimental validation of TF binding site affinities.
Analysis of TF binding site distribution in eukaryotic genomes.

Main Results:

Demonstrated the critical role of low-affinity binding sites in gene regulation.
Provided evidence that a range of binding affinities are utilized by transcription factors.
Highlighted the importance of low-affinity sites for developmental processes.

Conclusions:

Low-affinity transcription factor binding sites are essential for robust, precise, and specific gene regulation.
The widespread use of low-affinity sites impacts the evolution of gene regulatory networks.
Understanding low-affinity binding is key to comprehending complex gene expression patterns.