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CENP-A nucleosome clusters form rosette-like structures around HJURP during G1
Leonid Andronov1,2,3,4,5, Khalid Ouararhni2,3,4,5,6, Isabelle Stoll2,3,4,5,6
1Centre for Integrative Biology (CBI), Department of Integrated Structural Biology, IGBMC, CNRS, Inserm, Université de Strasbourg, 1 rue Laurent Fries, 67404, Illkirch, France.
Nature Communications
|October 2, 2019
Summary
Researchers discovered that centromere protein A (CENP-A) nucleosomes form distinct, rosette-like clusters during the G1 cell cycle phase. These HJURP-nucleated structures are crucial for organizing centromeric chromatin in human cells.
Area of Science:
- Cell Biology
- Epigenetics
- Chromatin Organization
Background:
- Centromere protein A (CENP-A) is a histone H3 variant essential for epigenetic centromere marking.
- Understanding CENP-A organization is key to centromere function and cell division.
Purpose of the Study:
- To investigate the structural organization of CENP-A nucleosomes during the G1 phase.
- To elucidate the role of HJURP in CENP-A deposition and centromere chromatin assembly.
Main Methods:
- Super-resolution microscopy (2D and 3D)
- Segmentation analysis
- Co-localization studies
Main Results:
- CENP-A nucleosomes form characteristic globular rosette-like clusters (∼250-300 nm) in G1.
- These clusters mature into more compact structures by late G1.
- The CENP-A chaperone HJURP localizes to the cluster center, acting as a nucleation point.
Conclusions:
- HJURP-mediated nucleation of CENP-A is identified in human cells.
- The study reveals the structural basis of CENP-A chromatin organization at centromeres.
- Provides insights into CENP-A deposition mechanisms and centromeric chromatin assembly.
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