Alpha-synuclein alters the faecal viromes of rats in a gut-initiated model of Parkinson's disease
Stockdale, S. R.; Draper, L. A.; O'Donovan, S.; Barton, W.; O'Sullivan, O.; Volpicelli-Daley, L. A.; Sullivan, A.; O'Neill, C.; Hill, C.
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Parkinsons disease (PD) is a chronic neurological disorder associated with the misfolding of alpha-synuclein (-syn) into Lewy body aggregates within nerve cells that contribute to their neurodegeneration. Recent evidence suggests -syn aggregation may begin in the gut and travel to the brain along the vagus nerve, with microbes a potential trigger initiating the misfolding of -syn. However, changes in the gut virome in response to -syn alterations have not been investigated. In this study, we show longitudinal changes in the faecal virome of rats administered either monomeric or preformed fibrils (PFF) of -syn directly into their enteric nervous system. Differential changes in rat viromes were observed when comparing monomeric and PFF -syn. The virome {beta}-diversity changes after -syn treatment were compounded by the addition of LPS as an adjunct. Changes in the diversity of rat faecal viromes were observed after one month and did not resolve within the studys five month observational period. Overall, these results suggest that microbiome alterations associated with PD may, partially, be reactive to host -syn associated changes.
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