PLPPR1 and Parkinson disease: These two genes are also the only genes in the present analysis with SNPs above the diagonal in the summary ssGWAS quantile-rank (QR, often: QQ) plot (Fig 1 left), although the QR plots of several individual chromosomes show association in chromosomes 4 (the SNCA–MMRN122915 region), 5 (breast cancer associated transcript BRCAT54100506674, non-coding), 6 (PARK25071, the Parkinson’s disease [PD] ubiquitin ligase Parkin), and 9 (LPPR154886, phospholipid phosphatase-related 1) (Fig B in S1 File).