SLC15A3 and Parkinson disease: Reverse Transcription-Polymerase Chain Reaction results of RNAs isolated from peripheral blood samples of PD patients showed that mRNA expression levels of LSP1, LIRB1, and MBOAT7 in the PD group were higher than those in the control group (< 0.05), but the expression levels of SIPA1, SLC15A3, TLE3, and RNF24 was not significantly different between the two groups (Figure 6).