ZNHIT1 and Parkinson disease: We next investigated the correlation between the top ranked gene, ZNHIT1, and SNCA in the SN of samples classified as controls (n = 8), Braak stage 1/2 (n = 5), Braak stage 3/4 (n = 7) and Braak stage 5/6 (n = 8) PD, to investigate at which disease state the co-expression patterns break down.