The RT-PCR analysis of the PBMC samples revealed significant differences in mRNA abundance of the hub genes (MRPL11, MRPS12, UQCRH, ATP5I, UQCRQ, ATP5D, COX6B1, ATP5O, ATP5H, and NDUFA6) between COVID-19 and Preeclampsia cohorts, respectively (Figure 8). This evidence concerns the gene UQCRH and COVID-19.