ALDH1A1 and Parkinson disease: The Aldh1a7 gene is located next to the Aldh1a1 in the mouse chromosome 19 and is highly homologous to the Aldh1a1. Aldh1a7 gene is absent in the human genome, which may contribute to the higher sensitivity of human DANs to dopamine-related cytotoxicity and PD-related genetic insults (Cai et al., 2014; Liu et al., 2014).