Causal Associations of PM2.5 and GDM: A Two-Sample Mendelian Randomization Study
Yi Yang1,2, Xianli Ma1,2, Weiyi Pang3
1Guangxi Engineering Research Center for Pharmaceutical Molecular Screening and Druggability Evaluation, Guilin Medical University, Guilin 541199, China.
Toxics
|February 28, 2023
Summary
Exposure to fine particulate matter (PM2.5) may causally increase the risk of gestational diabetes mellitus (GDM). This Mendelian randomization study found a significant association, even after adjusting for BMI and smoking.
Area of Science:
- Environmental Epidemiology
- Genetic Epidemiology
- Reproductive Health
Background:
- Observational studies suggest a link between particulate matter (PM2.5) exposure and gestational diabetes mellitus (GDM).
- The causal nature of this association remains unconfirmed.
- Understanding environmental risk factors for GDM is crucial for public health.
Purpose of the Study:
- To investigate the potential causal relationship between PM2.5 exposure and GDM risk.
- To utilize Mendelian randomization to assess causality, overcoming limitations of observational studies.
- To determine if the association persists after accounting for key confounders like BMI and smoking.
Main Methods:
- Two-sample Mendelian randomization (MR) analysis using summary statistics from genome-wide association studies (GWAS).
- Inverse variance weighted (IVW) method applied for primary analysis.
- Multivariable MR (MVMR) performed to adjust for potential confounders: body mass index (BMI) and smoking.
Main Results:
- A significant causal effect of PM2.5 on GDM risk was identified.
- Each standard deviation increase in PM2.5 was associated with a 73.6% increase in GDM risk (OR: 1.736; 95% CI: 1.226-2.457).
- The causal association remained robust after adjusting for BMI and smoking in the MVMR analysis.
Conclusions:
- This study provides evidence for a causal relationship between PM2.5 exposure and an increased risk of developing GDM.
- Environmental air pollution is a modifiable risk factor for GDM.
- Public health strategies aimed at reducing PM2.5 exposure may help mitigate GDM incidence.
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