Genome-wide association study of sepsis in extremely premature infants.

Academic Article

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.
  • Authors

    Keywords

  • ELBW, Genetics, extreme prematurity, infection, 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
  • Digital Object Identifier (doi)

    Author List

  • Srinivasan L; Page G; Kirpalani H; Murray JC; Das A; Higgins RD; Carlo WA; Bell EF; Goldberg RN; Schibler K
  • Start Page

  • F439
  • End Page

  • F445
  • Volume

  • 102
  • Issue

  • 5