A Drosophila Model of ALS: Human ALS-Associated Mutation in VAP33A Suggests a Dominant Negative Mechanism
Author Information
Author(s): Ratnaparkhi Anuradha, Lawless George M., Schweizer Felix E., Golshani Peyman, Jackson George R.
Primary Institution: David Geffen School of Medicine at the University of California Los Angeles
Hypothesis
The ALS8 mutation in VAPB functions through a dominant negative mechanism affecting synaptic function.
Conclusion
The study demonstrates that the ALS8 mutation in dVAP33A impairs VAP function and interferes with BMP signaling pathways at the neuromuscular junction.
Supporting Evidence
- The ALS8 mutation leads to aggregation of the mutant protein and recruitment of wild type VAP into these aggregates.
- Expression of the mutant protein interferes with BMP signaling at the neuromuscular junction.
- Neuronal expression of VAPP58S increases bouton size, similar to loss of function mutations.
- VAPP58S functions as a dominant negative by inhibiting the activity of wild type VAP.
Takeaway
Scientists created a fruit fly model to study a mutation linked to ALS, finding that this mutation disrupts normal protein function and signaling in the nervous system.
Methodology
The study used genetic and morphological analyses in Drosophila to assess the effects of the ALS8 mutation on VAP function.
Limitations
The study primarily focuses on a single mutation and its effects, which may not encompass all mechanisms of ALS.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website