Abstract
The majority of cases of severe pediatric respiratory syncytial virus (RSV) infection occur in otherwise healthy infants who have no identifiable risk factors, suggesting that additional subclinical factors, such as population genetic variation, influence the course of RSV infection. The objective of this study was to test if common single nucleotide polymorphisms (SNPs) in genes encoding for immune signalling components of the RIG-I-like receptor (RLR) and IL-4-signalling pathways affect the outcome of RSV infection in early life. We genotyped 8 SNPs using allele-specific probes combined with real-time PCR. Each of the SNPs tested had previously been established to have a functional impact on immune responsiveness and two of the SNPs in the IL4 and IL4R genes had previously been associated with severe RSV bronchiolitis. Association with susceptibility to severe RSV infection was tested by statistically comparing genotype and allele frequencies in infants and young children hospitalized with severe RSV bronchiolitis (n = 140) with two control groups—children who tested positive for RSV but did not require hospitalization (n = 100), and a general population control group (n = 285). Our study was designed with sufficient power (>80%) to detect clinically-relevant associations with effect sizes ≥1.5. However, we detected no statistically significant differences in allele and genotype frequencies of the investigated SNPs between the inpatient and control groups. To conclude, we could not replicate the previously reported association with SNPs in the IL4 and IL4R genes in our independent cohort, nor did we find that common SNPs in genes encoding for RLRs and the downstream adapter MAVS were associated with susceptibility to severe RSV infections. Despite the existing evidence demonstrating a functional immunological impact of these SNPs, our data suggest that the biological effect of each individual SNP is unlikely to affect clinical outcomes of RSV infection.
Highlights
Human respiratory syncytial virus (RSV) is the most important respiratory pathogen of early life
single nucleotide polymorphisms (SNPs) were considered common if they had a global minor allele frequency (MAF) of .5% (i.e. MAF reported in dbSNP from the current 1000Genome default population including 1094 worldwide individuals [31])
To test whether any of these SNPs may affect the outcome of RSV infection in children, we genotyped 140 children who were hospitalized with confirmed RSV infection, 100 children who tested positive for RSV infection but had less severe disease manifestations and did not require hospital admission, as well as a general population control group (n = 285) of healthy term neonates
Summary
Human respiratory syncytial virus (RSV) is the most important respiratory pathogen of early life. Severe respiratory virus infection in early life is an important risk factor for the development of asthma [5]. A complex combination of environmental, pathogen and host genetic factors determines both susceptibility to pathogens and the course of infection. Infectious diseases have an inherited element and individuals with different genetic backgrounds respond differently to particular infections. The early death of a biological parent from infection increased the risk of death of the child from an infectious disease nearly six-fold. The death of an adoptive parent from an infectious disease had no significant effect on the adoptees’ risk of such a death [6,7]
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