Edward Cantu1, Rupal J Shah2, Wei Lin3, Zhongyin J Daye3, Joshua M Diamond2, Yoshikazu Suzuki4, John H Ellis4, Catherine F Borders4, Gerald A Andah4, Ben Beduhn4, Nuala J Meyer2, Melanie Ruschefski2, Richard Aplenc5, Rui Feng3, Jason D Christie2. 1. Cardiovascular Surgery Division, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pa. Electronic address: edward.cantu@uphs.upenn.edu. 2. Pulmonary, Allergy, and Critical Care Division, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pa; Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Division of Oncology, Philadelphia, Pa. 3. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Division of Oncology, Philadelphia, Pa. 4. Cardiovascular Surgery Division, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pa. 5. Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania Perelman School of Medicine, Division of Oncology, Philadelphia, Pa; Division of Oncology, Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pa.
Abstract
OBJECTIVE: Oxidant stress pathway activation during ischemia reperfusion injury may contribute to the development of primary graft dysfunction (PGD) after lung transplantation. We hypothesized that oxidant stress gene variation in recipients and donors is associated with PGD. METHODS: Donors and recipients from the Lung Transplant Outcomes Group (LTOG) cohort were genotyped using the Illumina IBC chip filtered for oxidant stress pathway genes. Single nucleotide polymorphisms (SNPs) grouped into SNP sets based on haplotype blocks within 49 oxidant stress genes selected from gene ontology pathways and literature review were tested for PGD association using a sequencing kernel association test. Analyses were adjusted for clinical confounding variables and population stratification. RESULTS: Three hundred ninety-two donors and 1038 recipients met genetic quality control standards. Thirty percent of patients developed grade 3 PGD within 72 hours. Donor NADPH oxidase 3 (NOX3) was associated with PGD (P = .01) with 5 individual significant loci (P values between .006 and .03). In recipients, variation in glutathione peroxidase (GPX1) and NRF-2 (NFE2L2) was significantly associated with PGD (P = .01 for both). The GPX1 association included 3 individual loci (P values between .006 and .049) and the NFE2L2 association included 2 loci (P = .03 and .05). Significant epistatic effects influencing PGD susceptibility were evident between 3 different donor blocks of NOX3 and recipient NFE2L2 (P = .026, P = .017, and P = .031). CONCLUSIONS: Our study has prioritized GPX1, NOX3, and NFE2L2 genes for future research in PGD pathogenesis, and highlights a donor-recipient interaction of NOX3 and NFE2L2 that increases the risk of PGD.
OBJECTIVE: Oxidant stress pathway activation during ischemia reperfusion injury may contribute to the development of primary graft dysfunction (PGD) after lung transplantation. We hypothesized that oxidant stress gene variation in recipients and donors is associated with PGD. METHODS: Donors and recipients from the Lung Transplant Outcomes Group (LTOG) cohort were genotyped using the Illumina IBC chip filtered for oxidant stress pathway genes. Single nucleotide polymorphisms (SNPs) grouped into SNP sets based on haplotype blocks within 49 oxidant stress genes selected from gene ontology pathways and literature review were tested for PGD association using a sequencing kernel association test. Analyses were adjusted for clinical confounding variables and population stratification. RESULTS: Three hundred ninety-two donors and 1038 recipients met genetic quality control standards. Thirty percent of patients developed grade 3 PGD within 72 hours. DonorNADPH oxidase 3 (NOX3) was associated with PGD (P = .01) with 5 individual significant loci (P values between .006 and .03). In recipients, variation in glutathione peroxidase (GPX1) and NRF-2 (NFE2L2) was significantly associated with PGD (P = .01 for both). The GPX1 association included 3 individual loci (P values between .006 and .049) and the NFE2L2 association included 2 loci (P = .03 and .05). Significant epistatic effects influencing PGD susceptibility were evident between 3 different donor blocks of NOX3 and recipient NFE2L2 (P = .026, P = .017, and P = .031). CONCLUSIONS: Our study has prioritized GPX1, NOX3, and NFE2L2 genes for future research in PGD pathogenesis, and highlights a donor-recipient interaction of NOX3 and NFE2L2 that increases the risk of PGD.
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