Endoplasmic reticulum membrane complex 1 facilitates BK polyomavirus genotype III/IV replication for nephropathy

Area of Science:

• Nephrology
• Virology
• Immunology

Background:

• BK polyomavirus nephropathy (BKPyVN) significantly impacts kidney transplant outcomes.
• The role of BKPyV genotype in disease pathogenesis and host interactions requires further elucidation.

Purpose of the Study:

• To investigate the influence of BKPyV genotype on BKPyVN development and progression.
• To identify host factors involved in genotype-specific BKPyV replication and pathogenicity.

Main Methods:

• Analysis of kidney transplant recipients with BKPyV viruria and BKPyVN.
• VP1 genotyping of BKPyV isolates.
• Proteomic profiling and gene expression analysis of infected renal tubular epithelial cells.
• siRNA-mediated knockdown of Endoplasmic Reticulum Membrane Complex 1 (EMC1).

Main Results:

• Asymptomatic BKPyV viruria was associated with genotype I, while BKPyVN predominantly involved genotypes III/IV.
• Nephropathogenic BKPyV genotypes III/IV induced significant upregulation of EMC1 in renal tubular cells.
• EMC1 facilitates intracellular trafficking and replication of BKPyV genotypes III/IV, crucial for viral persistence.

Conclusions:

• Genotypic variation in BKPyV influences pathogenicity in kidney transplantation.
• EMC1 plays a critical role in the replication of nephropathogenic BKPyV genotypes.
• EMC1 represents a potential therapeutic target for managing BKPyVN and reducing allograft loss.