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Genome-wide association study of sepsis in extremely premature infants. Arch Dis Child Fetal Neonatal Ed 2017 Sep;102(5):F439-F445

Date

03/12/2017

Pubmed ID

28283553

Pubmed Central ID

PMC5563277

DOI

10.1136/archdischild-2016-311545

Abstract

OBJECTIVE: To identify genetic variants associated with sepsis (early-onset and late-onset) using a genome-wide association (GWA) analysis in a cohort of extremely premature infants.

STUDY DESIGN: Previously generated GWA data from the Neonatal Research Network's anonymised genomic database biorepository of extremely premature infants were used for this study. Sepsis was defined as culture-positive early-onset or late-onset sepsis or culture-proven meningitis. Genomic and whole-genome-amplified DNA was genotyped for 1.2 million single-nucleotide polymorphisms (SNPs); 91% of SNPs were successfully genotyped. We imputed 7.2 million additional SNPs. p Values and false discovery rates (FDRs) were calculated from multivariate logistic regression analysis adjusting for gender, gestational age and ancestry. Target statistical value was p<10-5. Secondary analyses assessed associations of SNPs with pathogen type. Pathway analyses were also run on primary and secondary end points.

RESULTS: Data from 757 extremely premature infants were included: 351 infants with sepsis and 406 infants without sepsis. No SNPs reached genome-wide significance levels (5×10-8); two SNPs in proximity to FOXC2 and FOXL1 genes achieved target levels of significance. In secondary analyses, SNPs for ELMO1, IRAK2 (Gram-positive sepsis), RALA, IMMP2L (Gram-negative sepsis) and PIEZO2 (fungal sepsis) met target significance levels. Pathways associated with sepsis and Gram-negative sepsis included gap junctions, fibroblast growth factor receptors, regulators of cell division and interleukin-1-associated receptor kinase 2 (p values<0.001 and FDR<20%).

CONCLUSIONS: No SNPs met genome-wide significance in this cohort of extremely low birthweight infants; however, areas of potential association and pathways meriting further study were identified.

Author List

Srinivasan L, Page G, Kirpalani H, Murray JC, Das A, Higgins RD, Carlo WA, Bell EF, Goldberg RN, Schibler K, Sood BG, Stevenson DK, Stoll BJ, Van Meurs KP, Johnson KJ, Levy J, McDonald SA, Zaterka-Baxter KM, Kennedy KA, Sánchez PJ, Duara S, Walsh MC, Shankaran S, Wynn JL, Cotten CM, Eunice Kennedy Shriver National Institute of Child Health and Human Development Neonatal Research Network

Author

Girija Ganesh Konduri MD Chief, Professor in the Pediatrics department at Medical College of Wisconsin




MESH terms used to index this publication - Major topics in bold

ATP-Binding Cassette Transporters
Adaptor Proteins, Signal Transducing
Cohort Studies
Endopeptidases
Female
Forkhead Transcription Factors
GTPase-Activating Proteins
Genome-Wide Association Study
Genotype
Humans
Infant, Extremely Premature
Infant, Newborn
Ion Channels
Male
Microfilament Proteins
Polymorphism, Single Nucleotide
Sepsis
jenkins-FCD Prod-478 d1509cf07a111124a2d122fd3df854cc0b993c00