loading page

Childhood Asthma and Type 1 Diabetes Mellitus: A Meta-analysis and Bidirectional Mendelian Randomization Study
  • +8
  • Xiaowen Zhang,
  • Junyang Xie,
  • Gui Chen,
  • Tianhao Liang,
  • Ang Li,
  • Weixing Liu,
  • Yiyan Wang,
  • Xiaofen Wang,
  • Xiaoxuan Kuang,
  • Wenjing Liao,
  • Lijuan Song
Xiaowen Zhang
First Affiliated Hospital of Guangzhou Medical University

Corresponding Author:entxiaowen@163.com

Author Profile
Junyang Xie
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Gui Chen
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Tianhao Liang
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Ang Li
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Weixing Liu
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Yiyan Wang
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Xiaofen Wang
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Xiaoxuan Kuang
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Wenjing Liao
First Affiliated Hospital of Guangzhou Medical University
Author Profile
Lijuan Song
First Affiliated Hospital of Guangzhou Medical University
Author Profile

Abstract

Objectives: World-wide incidence and prevalence of both asthma and type 1 diabetes mellitus (T1DM) has been increasing in past decades. Association between the two diseases has been found in some but not other studies. We conducted a meta-analysis to verify such an association, and bidirectional Mendelian randomization analysis to examine the potential cause-effect relationships. Methods: Three databases(PubMed, Embase and Web of Science) were searched from their inception to February 1, 2021. Pooled hazard ratios (HR) or odds ratios (OR), and 95% confidence intervals, were calculated. Associations between single-nucleotide polymorphisms with childhood asthma and T1DM were selected based on genome-wide association studies. The outcome datasets were obtained from FinnGen study. We used the inverse variance-weighted, weighted median and MR-Egger methods to estimate causal effects. To assess robustness and horizontal pleiotropy, MR-Egger regression and MR pleiotropy residual sum and outlier test was conducted. Results: In meta-analysis, childhood asthma was associated with an increased risk of T1DM (HR=1.30, 95% CI 1.05–1.61, P=0.014), whereas T1DM was not associated with the risk of asthma (HR=0.98, 95% CI 0.64–1.51, P=0.941; OR=0.84, 95% CI 0.65–1.08, P=0.168). MR analysis indicated increased genetic risk of T1DM in children with asthma (OR=1.308; 95% CI 1.030-1.661; P =0.028). Analysis using the IVW method indicated decreased genetic risk of asthma in children with T1DM (OR = 0.937, 95%CI 0.881-0.996, P = 0.037). Conclusions: Childhood asthma is a risk factor for T1DM; T1DM is a possible protective factor for childhood asthma.