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Single-Molecule Imaging of EWS-FLI1 Condensates Assembling on DNA
Published on: September 8, 2021
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USP19 deubiquitinates EWS-FLI1 to regulate Ewing sarcoma growth
Maria E Gierisch1, Gloria Pedot1, Franziska Walser1
1Department of Oncology and Children's Research Center, University Children´s Hospital, Steinwiesstrasse 32, 8032, Zurich, Switzerland.
Scientific Reports
|February 1, 2019
Summary
Ubiquitin specific protease 19 (USP19) regulates Ewing sarcoma's EWS-FLI1 oncoprotein. Inhibiting USP19 reduces EWS-FLI1, decreasing tumor growth and offering a potential new therapy for this pediatric cancer.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ewing sarcoma is a prevalent pediatric bone and soft tissue tumor.
- The EWS-FLI1 fusion oncoprotein drives tumor cell survival.
- EWS-FLI1 protein stability is regulated by the ubiquitin proteasome system.
Purpose of the Study:
- To identify regulators of EWS-FLI1 stability.
- To investigate the role of USP19 in Ewing sarcoma pathogenesis.
- To explore therapeutic strategies targeting deubiquitinating enzymes.
Main Methods:
- siRNA-based screening to identify EWS-FLI1 regulators.
- USP19 depletion and overexpression experiments.
- In vitro cell growth and colony formation assays.
- In vivo tumor growth studies in mouse models.
Main Results:
- USP19 was identified as a key regulator of EWS-FLI1 stability.
- USP19 depletion decreased EWS-FLI1 levels, cell growth, and tumor growth.
- USP19 specifically stabilizes the EWS-FLI1 fusion protein.
- USP19 binds to the N-terminal EWS region, regulating deubiquitination.
Conclusions:
- USP19 stabilizes the EWS-FLI1 oncoprotein in Ewing sarcoma.
- Targeting USP19 or other deubiquitinating enzymes may offer a novel therapeutic approach.
- The N-terminal EWSR1 domain is crucial for fusion protein stability regulation.
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