Integrating Single‐Cell RNA‐Seq and Bulk RNA‐Seq Reveals Ischemic Injury Promoting Polyomavirus Replication by DNA Damage Response

BK polyomavirus (BKPyV) can establish persistent infections in 90% of the healthy adult population, and its reactivation is associated with graft failure in kidney transplant patients. Ischemic injury (IS) increases the risk of viral reactivation, making BKPyV a primary cause of allograft failure. However, the detailed molecular mechanisms of IS that promote BKPyV replication are not well characterized. The aim of the study was to identify the critical pathways and hub genes involved in IS's promotion of polyomavirus replication based on single-cell RNA-seq and bulk RNA-seq data. We found that IS could activate the DNA damage response pathway to promote polyomavirus replication. Additionally, we identified CDK1 as a hub gene according to the conservation of gene expression pattern and key pathways in mice and humans. Subsequently, using siRNA experiments, we demonstrated that CDK1 knockdown inhibits BKPyV replication. Together, the present study found that IS could regulate the expression of CDK1 via the "DNA damage response" pathway to promote polyomavirus replication.