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Histone acetylation and histone deacetylation.
1Thoracic Medicine, Imperial College Sch. Medicine, National Heart and Lung Institute, London, UK.
Molecular Biotechnology
|March 6, 2002
Summary
Measuring histone acetyltransferase (HAT) and deacetylase (HDAC) activity in cells is crucial for understanding gene transcription. This study details methods to quantify HAT and HDAC activity in A549 cells and associated with specific co-activators.
Area of Science:
- Molecular Biology
- Epigenetics
- Gene Regulation
Background:
- Nucleosomal DNA unwinding is key to inflammatory gene transcription.
- Histone acetylation regulates DNA accessibility: increased acetylation loosens DNA, enhancing transcription, while hypoacetylation tightens DNA, reducing transcription.
- Histone acetyltransferase (HAT) and deacetylase (HDAC) enzymes play critical roles in this process.
Purpose of the Study:
- To describe methods for measuring whole cell HAT and HDAC activities in A549 cells.
- To present a technique for assessing HAT activity associated with the co-activator CBP.
- To demonstrate the applicability of these methods to primary cells and biopsy samples.
Main Methods:
- Measurement of whole cell histone acetyltransferase (HAT) and deacetylase (HDAC) activities.
- Immunoprecipitation technique to isolate the co-activator CBP.
- Assay for HAT activity specifically associated with isolated CBP.
Main Results:
- Established protocols for quantifying HAT and HDAC activities in A549 cells.
- Developed a method to measure HAT activity linked to the CBP co-activator.
- Validated the adaptability of these assays for diverse cellular and tissue samples.
Conclusions:
- The described methods provide a robust framework for analyzing cellular HAT and HDAC enzymatic activities.
- These techniques are valuable for investigating the epigenetic regulation of gene transcription in various biological contexts.
- The study facilitates further research into the role of histone acetylation in gene expression and disease.