The researchers used a fly model and tested the effect of elevated presence of α-synuclein in the eye. Interestingly, they observed that removal of the gene called Usp8 in the fly’s eye reduced α-synuclein levels and associated eye toxicity (illustration). Usp8 is a protease that cleaves ubiquitin, a small protein that can be “tagged” to protein substrates such as α-synuclein.
When Usp8 protease function is removed, it can correct defects due to α-synuclein accumulation, similar to what is observed in neurons affected in Parkinson’s disease. This discovery suggests a novel route to develop drugs for the treatment of this brain disease.