Finally, differentially expressed genes in the kidneys of patients with COVID-19 and AKI included 19 of 237 COVID-19 susceptibility genes: RPL24, OAS1-3, ARHGAP27, PPP1R15A, GOLGA3, XCR1, MX1, RUSC1, TCF19, POLD1, NOTCH4, HLA-E, PROC, GC, MRPS21, PDE4A, and ATP5PO [35]. Here, PDE4A is linked to COVID-19.