OLIG2 and major depressive disorder: In three studies of suicide patients with MDD, transcriptions of makers for astrocyte (ALDH1L1), microglia (CX3CR1, CD68, ITGAM, HLA-DRA, and AIF1), and oligodendrocytes protein (OLIG2, MOG, and PLP) were not changed in the ACC and DLPFC [76], and decreased transcripts in the PFC were significantly enriched in microglia [80] when compared with non-suicide patients with MDD.