SNCAIP and Parkinson disease: We also uncovered clear signals of selection exclusive to the BF population in regions including genes capable of eliciting changes in behavior through their involvement in neuromodulation, particularly in relation to a direct association with dopaminergic transmission: DDC (BF5-Chr2). Additionally, we detected major selection signals in the BF in regions enclosing two other genes involved in synaptic transmission and related to the molecular etiology of Parkinson’s disease (PD): SCNA (BF7-Chr4) and SNCAIP (BF8-ChrZ) (Table 1).