The virome in early life and childhood and development of islet autoimmunity and type 1 diabetes: A systematic review and meta-analysis of observational studies
- PMID: 33378601
- PMCID: PMC8518965
- DOI: 10.1002/rmv.2209
The virome in early life and childhood and development of islet autoimmunity and type 1 diabetes: A systematic review and meta-analysis of observational studies
Abstract
Viruses are postulated as primary candidate triggers of islet autoimmunity (IA) and type 1 diabetes (T1D), based on considerable epidemiological and experimental evidence. Recent studies have investigated the association between all viruses (the 'virome') and IA/T1D using metagenomic next-generation sequencing (mNGS). Current associations between the early life virome and the development of IA/T1D were analysed in a systematic review and meta-analysis of human observational studies from Medline and EMBASE (published 2000-June 2020), without language restriction. Inclusion criteria were as follows: cohort and case-control studies examining the virome using mNGS in clinical specimens of children ≤18 years who developed IA/T1D. The National Health and Medical Research Council level of evidence scale and Newcastle-Ottawa scale were used for study appraisal. Meta-analysis for exposure to specific viruses was performed using random-effects models, and the strength of association was measured using odds ratios (ORs) and 95% confidence intervals (CIs). Eligible studies (one case-control, nine nested case-control) included 1,425 participants (695 cases, 730 controls) and examined IA (n = 1,023) or T1D (n = 402). Meta-analysis identified small but significant associations between IA and number of stool samples positive for all enteroviruses (OR 1.14, 95% CI 1.00-1.29, p = 0.05; heterogeneity χ2 = 1.51, p = 0.68, I2 = 0%), consecutive positivity for enteroviruses (1.55, 1.09-2.20, p = 0.01; χ2 = 0.19, p = 0.91, I2 = 0%) and number of stool samples positive specifically for enterovirus B (1.20, 1.01-1.42, p = 0.04; χ2 = 0.03, p = 0.86, I2 = 0%). Virome analyses to date have demonstrated associations between enteroviruses and IA that may be clinically significant. However, larger prospective mNGS studies with more frequent sampling and follow-up from pregnancy are required to further elucidate associations between early virus exposure and IA/T1D.
Keywords: childhood; islet autoimmunity; next-generation sequencing; type 1 diabetes; virome.
© 2020 The Authors. Reviews in Medical Virology published by John Wiley & Sons Ltd.
Conflict of interest statement
This work was supported by the National Health and Medical Research Council Practitioner fellowship APP1136735 (to Maria E. Craig), the Juvenile Diabetes Research Foundation International Postdoctoral Fellowship 3‐PDF‐2020‐940‐A‐N and the Australian Diabetes Society Lindsey Baudinet Award (to Ki Wook Kim). The authors would like to thank Professors Ondrej Cinek and Kendra Vehik for providing supplementary raw data for inclusion in this systematic review.
The author declares that there is no conflict of interests.
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