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Interrelationships between nuclear structure and ligand-activated intracellular receptors
1Department of Pharmacological and Physiological Science, Saint Louis University School of Medicine, MO 63104, USA.
Critical Reviews in Eukaryotic Gene Expression
|January 1, 1996
Summary
Ligand-activated gene expression involves chromatin remodeling. Nuclear matrix and nucleosomes, along with specific proteins, regulate gene activation and specificity in response to ligands.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Ligand-activated intracellular receptors initiate gene expression through complex processes.
- Chromatin structure alterations are crucial for these gene activation pathways.
Purpose of the Study:
- To investigate the roles of nuclear structures and proteins in ligand-induced gene activation.
- To elucidate the mechanisms underlying tissue and species specificity in receptor-mediated gene responses.
Main Methods:
- Analysis of steroid hormone receptor superfamily members.
- Examination of ligand-activated basic region/helix-loop-helix transcriptional activators.
- In vivo studies on receptor function, promoter accessibility, and transcription factor interactions.
Main Results:
- Nuclear matrix and nucleosomes are key structures in early gene activation stages.
- Cell- and tissue-specific nuclear matrix proteins and modified histones confer specificity.
- Ligand-receptor complexes interact with nuclear matrix and nucleosomes to modulate gene expression.
Conclusions:
- Ligand-receptor mediated gene activation requires dynamic chromatin structure modifications.
- Nuclear matrix proteins and nucleosomes provide specificity by controlling DNA conformation and accessibility.
- These interactions ensure precise regulation of gene expression in response to cellular signals.