IFITM3, TLR3, and CD55 Gene SNPs and Cumulative Genetic Risks for Severe Outcomes in Chinese Patients with H7N9/H1N1pdm09 Influenza
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We examined associations between single-nucleotide polymorphisms (SNPs) of IFITM3, TLR3, and CD55 genes and influenza clinical outcomes in Chinese.

A multicenter study was conducted on 275 adult cases of avian (H7N9) and pandemic (H1N1pdm09) influenza. Host DNA was extracted from diagnostic respiratory samples; IFITM3 rs12252, TLR3 rs5743313, CD55 rs2564978, and TLR4 rs4986790/4986791 were targeted for genotyping (Sanger sequencing). The primary outcome analyzed was death.

IFITM3 and TLR3 SNPs were in Hardy–Weinberg equilibrium; their allele frequencies (IFITM3/C-allele 0.56, TLR3/C-allele 0.88) were comparable to 1000 Genomes Han Chinese data. We found over-representation of homozygous IFITM3 CC (54.5% vs 33.2%; P = .02) and TLR3 CC (93.3% vs 76.9%; P = .04) genotypes among fatal cases. Recessive genetic models showed their significant independent associations with higher death risks (adjusted hazard ratio [aHR] 2.78, 95% confidence interval [CI] 1.29–6.02, and aHR 4.85, 95% CI 1.11−21.06, respectively). Cumulative effects were found (aHR 3.53, 95% CI 1.64−7.59 per risk genotype; aHR 9.99, 95% CI 1.27−78.59 with both). Results were consistent for each influenza subtype and other severity indicators. The CD55 TT genotype was linked to severity. TLR4 was nonpolymorphic.

Host genetic factors may influence clinical outcomes of avian and pandemic influenza infections. Such findings have important implications on disease burden and patient care in at-risk populations.
Acceptance Date11/05/2017
All Author(s) ListNelson Lee, Bin Cao, Changwen Ke, Hongzhou Lu, Yunwen Hu, HT Claudia Tam, CW Ronald Ma, Dawei Guan, Zhaoqin Zhu, Hui Li, Lin Mulei, Rity YK Wong, Irene MH Yung, Tin-Nok Hung, Kirsty Kwok, Peter Horby, SC David Hui, CW Martin Chan, KS Paul Chan
Journal nameJournal of Infectious Diseases
Volume Number216
Issue Number1
PublisherOxford University Press
Place of PublicationUK
Pages97 - 104
LanguagesEnglish-United Kingdom
KeywordsIFITM3, influenza, outcomes, SNP, TLR3

Last updated on 2020-05-08 at 04:10