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Candidate gene variants of the immune system and sudden infant death syndrome

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Abstract

Background

Sudden infant death syndrome (SIDS) causes early infant death with an incidence between 0.5 and 2.5 cases among 1000 live births. Besides central sleep apnea and thermal dysregulation, infections have been repeatedly suggested to be implicated in SIDS etiology.

Methods

To test the risk contribution of common genetic variants related to infection, we genotyped 40 single-nucleotide polymorphisms (SNPs) from 15 candidate genes for association with SIDS in a total of 579 cases and 1124 controls from Germany and the UK in a two-stage case control design.

Results

The discovery-stage series (267 SIDS cases and 303 controls) revealed nominally significant associations for variants in interleukin 6 (IL6) (rs1880243), interleukin 10 (IL10) (rs1800871, rs1800872), and mannose-binding lectin 2 (MBL2) (rs930506), and for several other variants in subgroups. Meta-analyses were then performed in adding genotype information from a genome-wide association study of another 312 European SIDS cases and 821 controls. Overall associations were observed for two independent variants in MBL2: rs930506 in a co-dominant model (odds ratio (OR) = 0.82, p = 0.04) and rs1838065 in a dominant model (OR = 1.27, p = 0.03).

Conclusion

Our study did not replicate published associations of IL10 variants with SIDS. However, the evidence for two independent MBL2 variants in the combined analysis of two large series seems consistent with the hypothesis that infection may play a role in SIDS pathogenesis.

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Correspondence to Michael Klintschar.

Ethics declarations

The local ethics committee at Hannover Medical School has approved this study.

Statement of financial support

Intramural funding from Hannover Medical School and Financial assistance from the Foundation for the study of Infant Deaths (FSID), 11 Belgrave Road, London SW1V 1RB UK is kindly acknowledged.

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Study design. From 65 intended SNPs, 46 were successfully designed as a SNPtype assay. Six of them dropped out of the study because of poor clustering. Accordingly, 40 SNPs were part of the discovery and replication stage. A list of all 65 SNPs with rs codes is provided in the Study design. QC, Quality control (PDF 148 kb)

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Fard, D., Läer, K., Rothämel, T. et al. Candidate gene variants of the immune system and sudden infant death syndrome. Int J Legal Med 130, 1025–1033 (2016). https://doi.org/10.1007/s00414-016-1347-y

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  • DOI: https://doi.org/10.1007/s00414-016-1347-y

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