First name
Melanie
Last name
Rushefski

Title

IL1RN coding variant is associated with lower risk of acute respiratory distress syndrome and increased plasma IL-1 receptor antagonist.

Year of Publication

2013

Number of Pages

950-9

Date Published

2013 May 1

ISSN Number

1535-4970

Abstract

<p><strong>RATIONALE: </strong>Acute respiratory distress syndrome (ARDS) behaves as a complex genetic trait, yet knowledge of genetic susceptibility factors remains incomplete.</p>

<p><strong>OBJECTIVES: </strong>To identify genetic risk variants for ARDS using large scale genotyping.</p>

<p><strong>METHODS: </strong>A multistage genetic association study was conducted of three critically ill populations phenotyped for ARDS. Stage I, a trauma cohort study (n = 224), was genotyped with a 50K gene-centric single-nucleotide polymorphism (SNP) array. We tested SNPs associated with ARDS at P &lt; 5 × 10(-4) for replication in stage II, a trauma case-control population (n = 778). SNPs replicating their association in stage II (P &lt; 0.005) were tested in a stage III nested case-control population of mixed subjects in the intensive care unit (n = 2,063). Logistic regression was used to adjust for potential clinical confounders. We performed ELISA to test for an association between ARDS-associated genotype and plasma protein levels.</p>

<p><strong>MEASUREMENTS AND MAIN RESULTS: </strong>A total of 12 SNPs met the stage I threshold for an association with ARDS. rs315952 in the IL1RN gene encoding IL-1 receptor antagonist (IL1RA) replicated its association with reduced ARDS risk in stages II (P &lt; 0.004) and III (P &lt; 0.02), and was robust to clinical adjustment (combined odds ratio = 0.81; P = 4.2 × 10(-5)). Plasma IL1RA level was associated with rs315952C in a subset of critically ill subjects. The effect of rs315952 was independent from the tandem repeat variant in IL1RN.</p>

<p><strong>CONCLUSIONS: </strong>The IL1RN SNP rs315952C is associated with decreased risk of ARDS in three populations with heterogeneous ARDS risk factors, and with increased plasma IL1RA response. IL1RA may attenuate ARDS risk.</p>

DOI

10.1164/rccm.201208-1501OC

Alternate Title

Am. J. Respir. Crit. Care Med.

PMID

23449693
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Title

Oxidant stress regulatory genetic variation in recipients and donors contributes to risk of primary graft dysfunction after lung transplantation.

Year of Publication

2015

Number of Pages

596-602

Date Published

02/2015

ISSN Number

1097-685X

Abstract

<p><strong>OBJECTIVE: </strong>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.</p>

<p><strong>METHODS: </strong>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.</p>

<p><strong>RESULTS: </strong>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).</p>

<p><strong>CONCLUSIONS: </strong>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.</p>

DOI

10.1016/j.jtcvs.2014.09.077

Alternate Title

J. Thorac. Cardiovasc. Surg.

PMID

25439478
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