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The presynaptic protein α-synuclein (αSyn) has been implicated in both familial and sporadic forms of Parkinson's disease. We examined whether human αSyn-overexpressing mice under Thy1 promoter (Thy1-αSyn) display alterations of colonic function. Basal fecal output was decreased in Thy1-αSyn mice fed ad libitum. Fasted/refed Thy1-αSyn mice had a slower distal colonic transit than the wild-type mice, as monitored by 2.2-fold increase in time to expel an intracolonic bead and 2.9-fold higher colonic fecal content. By contrast, Thy1-αSyn mice had an increased fecal response to novelty stress and corticotropin releasing factor injected intraperipherally. These results indicate that Thy1-αSyn mice display altered basal and stress-stimulated propulsive colonic motility and will be a useful model to study gut dysfunction associated with Parkinson's disease.