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Blood. 2021 Oct 28;138(17):1628-1636. doi: 10.1182/blood.2021012153.

Genetic variants associated with cytomegalovirus infection after allogeneic hematopoietic cell transplantation.

Blood

Amanda M Casto, Sachiko Seo, David M Levine, Barry E Storer, Xinyuan Dong, John A Hansen, Michael Boeckh, Paul J Martin

Affiliations

  1. Department of Medicine, University of Washington School of Medicine, Seattle, WA.
  2. Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, WA.
  3. Department of Hematology and Oncology, Dokkyo Medical University, Tochigi, Japan.
  4. Department of Biostatistics, University of Washington, Seattle, WA; and.
  5. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, WA.

PMID: 34269803 PMCID: PMC8554648 DOI: 10.1182/blood.2021012153

Abstract

Human cytomegalovirus (CMV) reactivation is a frequent complication of allogeneic hematopoietic cell transplantation (HCT). Despite routine screening for CMV reactivation and early antiviral treatment, the rates of CMV-related complications after HCT remain high. Genetic variants in both the donor and recipient have been associated with the risk of CMV reactivation and disease after HCT, but these associations have not been validated, and their clinical importance remains unclear. In this study, we assessed 117 candidate variants previously associated with CMV-related phenotypes for association with CMV reactivation and disease in a cohort of 2169 CMV-seropositive HCT recipients. We also carried out a genome-wide association study (GWAS) for CMV reactivation and disease in the same cohort. Both analyses used a prespecified discovery and replication approach to control the risk of false-positive results. Among the 117 candidate variants, our analysis implicates only the donor ABCB1 rs1045642 genotype as a risk factor for CMV reactivation. This synonymous variant in P-glycoprotein may influence the risk of CMV reactivation by altering the efflux of cyclosporine and tacrolimus from donor lymphocytes. In the GWAS analysis, the donor CDC42EP3 rs11686168 genotype approached the significance threshold for association with CMV reactivation, although we could not identify a mechanism to explain this association. The results of this study suggest that most genomic variants previously associated with CMV phenotypes do not significantly alter the risk for CMV reactivation or disease after HCT.

© 2021 by The American Society of Hematology.

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