PARK7 and Parkinson disease: These transgenic flies show some of the traits of familial PD, with well characterized loss of dopaminergic neurons and motor impairment, except in the case of DJ-1 in which only motor impairment has been observed in DJ-1 β partial deletion (Greene et al., 2003; Pesah et al., 2004; Chen and Feany, 2005; Meulener et al., 2005; Park et al., 2005, 2006; Clark et al., 2006; Lavara-Culebras and Paricio, 2007; Sang et al., 2007) D. melanogaster transgenic models have also helped in elucidating the role of DJ-1, Parkin and PINK1 in mitochondrial physiology (Venderova et al., 2009; Cookson, 2012).