Related Experiment Videos
Nuclear compartmentalization at the G1/S transition plays a key role in DNA replication control
Asami Oji1,2, Kosuke Yusa3, Izumi Noda4
1Laboratory for Developmental Epigenetics, RIKEN Center for Biosystems Dynamics Research (BDR), Kobe, Japan. asami_oji@iqb.u-tokyo.ac.jp.
Nature Communications
|August 10, 2026
Summary
GINS4 is crucial for organizing DNA into A and B compartments during the G1-to-S phase transition. This nuclear architecture is vital for efficient DNA synthesis and replication timing regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Genomics
Background:
- Mammalian chromosomal DNA segregates into A and B compartments (euchromatin and heterochromatin) upon entering G1 phase.
- The functional role of this spatial DNA organization has been difficult to study due to limited manipulation methods.
Purpose of the Study:
- To identify factors regulating A/B compartment segregation during the G1-to-S phase transition.
- To investigate the functional significance of A/B compartment organization in DNA replication and nuclear architecture.
Main Methods:
- Genome-wide loss-of-function CRISPR screen to identify essential genes.
- GINS4 depletion experiments to analyze effects on DNA replication and nuclear organization.
Main Results:
- GINS4, a component of the replicative DNA helicase complex, was identified as essential for A/B compartment segregation.
- GINS4 depletion led to attenuated A/B compartments, impairing DNA synthesis efficiency.
- Defects in replication timing regulation were observed in cells with compromised A/B compartment organization.
Conclusions:
- GINS4 plays a previously unrecognized role in regulating nuclear architecture and DNA compartmentalization.
- Proper A/B compartment organization is critical for efficient DNA synthesis and replication timing.
- Nuclear compartmentalization is biologically significant for controlling DNA replication.