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Functional Characterization of Histone Chaperones Using SNAP-Tag-Based Imaging to Assess De Novo Histone Deposition
C Clément1, I Vassias1, D Ray-Gallet1
1Institut Curie, PSL Research University, CNRS, UMR3664, Equipe Labellisée Ligue contre le Cancer, Paris, France; Sorbonne Universités, UPMC Univ Paris 06, CNRS, UMR3664, Paris, France.
Methods in Enzymology
|July 4, 2016
Summary
This study introduces a novel in vivo imaging method to visualize histone deposition. The new technique, using SNAP-tagged histones, helps assess histone chaperone functions, like CAF-1 and HIRA, in chromatin organization.
Area of Science:
- Molecular Biology
- Cell Biology
- Epigenetics
Background:
- Histone chaperones are crucial for dynamic chromatin organization.
- Understanding their specific roles in histone variant deposition is essential.
- Previous methods relied on in vitro assays or protein complex isolation.
Purpose of the Study:
- To develop and validate an in vivo method for assessing de novo histone deposition.
- To investigate the functions of histone chaperones CAF-1 and HIRA using this new method.
- To analyze histone deposition in normal conditions and in response to DNA damage.
Main Methods:
- Utilized SNAP-tag-based imaging in cells expressing SNAP-tagged histones.
- Employed individual cell imaging to visualize de novo histone deposition in vivo.
- Combined imaging with siRNA-based depletion to assess histone chaperone function.
Main Results:
- Successfully visualized de novo histone deposition in living cells.
- Characterized the distinct roles of histone chaperones CAF-1 and HIRA.
- Documented the impact of CAF-1 and HIRA depletion on H3.1 and H3.3 deposition, with and without DNA damage.
Conclusions:
- The developed cellular assay enables direct in vivo visualization of histone deposition.
- This method provides a systematic approach to define chaperone function for specific histone variants.
- The findings offer new insights into chromatin dynamics and histone variant regulation.
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