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A Scalable, Cell-Based Method for the Functional Assessment of Ube3a Variants
Published on: October 10, 2022
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A luminescence-based biosensor to measure endogenous UBE3A activity.
Lei Xing1, Sophia U Lamberti1,2, Hannah C Nourie1,2
1UNC Neuroscience Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Iscience
|October 28, 2025
Summary
Researchers developed a sensitive Firefly-45aa biosensor to measure E3 ubiquitin ligase UBE3A activity. This tool helps classify mutations causing neurodevelopmental disorders and aids therapeutic development.
Area of Science:
- Biochemistry
- Molecular Biology
- Neurogenetics
Background:
- Mutations in the E3 ubiquitin ligase UBE3A lead to neurodevelopmental disorders.
- UBE3A interacts with PSMD4 via a specific 45 amino acid region.
Purpose of the Study:
- To create a sensitive luminescence-based biosensor for measuring UBE3A enzyme activity.
- To characterize the functional spectrum of UBE3A mutations.
Main Methods:
- A 45-amino acid PSMD4 region was fused to Firefly luciferase to create the Firefly-45aa biosensor.
- HEK293T cells and primary cells from mouse models were used to test UBE3A variants.
- Biosensor activity profiles were analyzed to classify mutations.
Main Results:
- The Firefly-45aa biosensor demonstrated high sensitivity in measuring UBE3A activity.
- Distinct activity profiles allowed classification of loss-of-function and gain-of-function UBE3A mutations.
- The biosensor quantified endogenous UBE3A activity in Angelman syndrome and GOF models.
Conclusions:
- The Firefly-45aa biosensor is a valuable tool for understanding UBE3A mutational effects.
- This biosensor facilitates functional characterization and therapeutic development for UBE3A-related disorders.
