Furthermore, Guo et al. studied the prevalence of mutations in four genes (PARK2, PINK1, DJ‐1, and ATP13A2) in 29 unrelated Chinese families with AREP and found that 10 patients with PD carried a heterozygous deletion of exon 3 in this gene (Guo et al., 2008). This evidence concerns the gene PRKN and Parkinson disease.