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Metamorphic T3-response genes have specific co-regulator requirements.
Emmanuelle Havis1, Laurent M Sachs, Barbara A Demeneix
1Département Régulations, Développement et Diversité Moléculaire, UMR-5166 CNRS, 7 Rue Cuvier, 75231 Paris Cedex 05, France.
EMBO Reports
|August 30, 2003
Summary
Thyroid hormone receptors (TRs) regulate gene expression by interacting with co-regulators. This study reveals gene-specific co-regulator requirements during amphibian metamorphosis, explaining distinct developmental responses.
Area of Science:
- Endocrinology
- Developmental Biology
- Molecular Biology
Background:
- Thyroid hormone receptors (TRs) modulate vertebrate physiology.
- TRs interact with co-repressors in the absence of thyroid hormone (T3) and coactivators in its presence.
- Mechanisms linking TRs to specific physiological outcomes remain unclear.
Purpose of the Study:
- Investigate how TRs interact with co-regulators to drive differential gene expression.
- Analyze the role of TRs in T3-dependent amphibian metamorphosis.
- Elucidate gene-specific co-regulator requirements.
Main Methods:
- Chromatin immunoprecipitation (ChIP) in pre-metamorphic tadpole tissue.
- Analysis of T3-responsive gene promoters.
- Assessment of histone modifications, specifically H4 acetylation.
Main Results:
- TRs bind to T3-responsive promoters irrespective of T3 presence.
- T3 addition induces histone H4 acetylation on target genes.
- Individual T3-responsive genes exhibit unique co-regulator needs for the T3-dependent switch.
Conclusions:
- TRs are constitutively bound to target gene promoters.
- Histone acetylation is a T3-mediated event on T3-response genes.
- Differential gene regulation during development is driven by gene-specific co-regulator interactions with TRs.