DDIT4 and schizophrenia: Among the 7 DEGs, the TNC gene was the only gene that decreased with schizophrenia and showed a positive correlation with PI (16:0/20:4), while the other 6 DEGs (COL1A2, COL6A2, DDIT4, FGF17, GNB3, and PDGFRB) increased with schizophrenia and showed a negative correlation with PI (16:0 /20:4).