DEK oncoprotein participates in heterochromatin replication via SUMO-dependent nuclear bodies.
J Cell Sci
; 136(23)2023 12 01.
Article
in En
| MEDLINE
| ID: mdl-37997922
The correct inheritance of chromatin structure is key for maintaining genome function and cell identity and preventing cellular transformation. DEK, a conserved non-histone chromatin protein, has recognized tumor-promoting properties, its overexpression being associated with poor prognosis in various cancer types. At the cellular level, DEK displays pleiotropic functions, influencing differentiation, apoptosis and stemness, but a characteristic oncogenic mechanism has remained elusive. Here, we report the identification of DEK bodies, focal assemblies of DEK that regularly occur at specific, yet unidentified, sites of heterochromatin replication exclusively in late S-phase. In these bodies, DEK localizes in direct proximity to active replisomes in agreement with a function in the early maturation of heterochromatin. A high-throughput siRNA screen, supported by mutational and biochemical analyses, identifies SUMO as one regulator of DEK body formation, linking DEK to the complex SUMO protein network that controls chromatin states and cell fate. This work combines and refines our previous data on DEK as a factor essential for heterochromatin integrity and facilitating replication under stress, and delineates an avenue of further study for unraveling the contribution of DEK to cancer development.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Heterochromatin
/
Neoplasms
Limits:
Humans
Language:
En
Journal:
J Cell Sci
Year:
2023
Document type:
Article
Affiliation country:
Country of publication: