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Co-activators and Co-repressors

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...

Co-activators and Co-repressors

Co-activators and Co-repressors

Transducer Mechanism: Nuclear Receptors

Transducer Mechanism: Nuclear Receptors

Nuclear receptors, or NRs, are unique transcription factors that regulate gene transcription and affect the cellular pathways involved in reproduction, development, or metabolism. Their ability to be stimulated by small lipophilic ligands and control vital cellular processes makes them ideal drug targets. Nearly 10-15% of currently prescribed drugs target these receptors.
About 48 different soluble family members of nuclear receptors are identified that can be divided into two main classes:

Cooperative Binding of Transcription Regulators

Cooperative Binding of Transcription Regulators

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...

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Nuclear receptor coregulator interactions: beyond the switch.

F Nafrisha Cassim Bawa^1,2, Mitchell A Lazar^3,2

¹Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.

Genes & Development

|December 18, 2025

Summary

Nuclear receptors (NRs) are proteins that regulate genes in response to signals. Their interactions with coregulators have evolved, impacting gene expression in health and disease.

Keywords:

coactivators coregulators corepressors hormone action nuclear receptors

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Area of Science:

Molecular Biology
Genetics
Endocrinology

Background:

Nuclear receptors (NRs) are crucial ligand-regulated transcription factors.
NRs are key targets for treating metabolic disorders, inflammation, and cancer.
NRs interact with DNA, ligands, and proteins, including coregulators.

Purpose of the Study:

To review the functional interactions between NRs and transcription modulators.
To focus on NR-coregulator interactions and their evolving mechanisms.
To understand how these interactions regulate ligand-dependent transcription.

Main Methods:

Literature review and synthesis of existing research.
Analysis of the evolution of NR-coregulator interaction models.
Examination of NR roles in dynamic gene expression.

Main Results:

NRs fine-tune transcriptional regulation through dynamic interactions with coactivators and corepressors.
The model of NR interaction has shifted from a binary switch to a coregulator shift mechanism.
These interactions integrate multiple signaling and metabolic pathways.

Conclusions:

Nuanced NR-coregulator interactions are central to dynamic gene expression.
Understanding these interactions is vital for physiology and disease.
NRs offer significant therapeutic potential through modulation of their regulatory networks.