Article ; Online: A Drosophila insulator interacting protein suppresses enhancer-blocking function and modulates replication timing.
2022 Volume 819, Page(s) 146208
Abstract: Insulators play important roles in genome structure and function in eukaryotes. Interactions between a DNA binding insulator protein and its interacting partner proteins define the properties of each insulator site. The different roles of insulator ... ...
Abstract | Insulators play important roles in genome structure and function in eukaryotes. Interactions between a DNA binding insulator protein and its interacting partner proteins define the properties of each insulator site. The different roles of insulator protein partners in the Drosophila genome and how they confer functional specificity remain poorly understood. The Suppressor of Hairy wing [Su(Hw)] insulator is targeted to the nuclear lamina, preferentially localizes at euchromatin/heterochromatin boundaries, and is associated with the gypsy retrotransposon. Insulator activity relies on the ability of the Su(Hw) protein to bind the DNA at specific sites and interact with Mod(mdg4)67.2 and CP190 partner proteins. HP1 and insulator partner protein 1 (HIPP1) is a partner of Su(Hw), but how HIPP1 contributes to the function of Su(Hw) insulator complexes is unclear. Here, we demonstrate that HIPP1 colocalizes with the Su(Hw) insulator complex in polytene chromatin and in stress-induced insulator bodies. We find that the overexpression of either HIPP1 or Su(Hw) or mutation of the HIPP1 crotonase-like domain (CLD) causes defects in cell proliferation by limiting the progression of DNA replication. We also show that HIPP1 overexpression suppresses the Su(Hw) insulator enhancer-blocking function, while mutation of the HIPP1 CLD does not affect Su(Hw) enhancer blocking. These findings demonstrate a functional relationship between HIPP1 and the Su(Hw) insulator complex and suggest that the CLD, while not involved in enhancer blocking, influences cell cycle progression. |
---|---|
MeSH term(s) | Animals ; Carrier Proteins/genetics ; Carrier Proteins/metabolism ; Cell Proliferation ; DNA Replication ; Drosophila/genetics ; Drosophila/metabolism ; Drosophila Proteins/genetics ; Drosophila Proteins/metabolism ; Enhancer Elements, Genetic ; Heterochromatin/metabolism ; Insulator Elements ; Microtubule-Associated Proteins/metabolism ; Mutation ; Nuclear Proteins/metabolism ; Repressor Proteins/genetics ; Repressor Proteins/metabolism |
Chemical Substances | CP190 protein, Drosophila ; Carrier Proteins ; Drosophila Proteins ; HIPP1 protein, Drosophila ; Heterochromatin ; Microtubule-Associated Proteins ; Nuclear Proteins ; Repressor Proteins ; su(Hw) protein, Drosophila |
Language | English |
Publishing date | 2022-01-29 |
Publishing country | Netherlands |
Document type | Journal Article |
ZDB-ID | 391792-7 |
ISSN | 1879-0038 ; 0378-1119 |
ISSN (online) | 1879-0038 |
ISSN | 0378-1119 |
DOI | 10.1016/j.gene.2022.146208 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
More links
Kategorien
In stock of ZB MED Cologne/Königswinter
Zs.A 1357: Show issues | Location: Je nach Verfügbarkeit (siehe Angabe bei Bestand) bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular Jg. 1995 - 2021: Lesesall (1.OG) ab Jg. 2022: Lesesaal (EG) |
Order via subito
This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.