Causal relationship between multiple sclerosis and asthma and chronic obstructive pulmonary disease based on...

Area of Science:

• Genetics
• Epidemiology
• Neurology

Background:

• Multiple Sclerosis (MS), asthma, and Chronic Obstructive Pulmonary Disease (COPD) are distinct conditions with complex etiologies.
• Understanding potential causal links between these diseases can inform public health strategies and treatment approaches.

Purpose of the Study:

• To investigate the potential causal relationship between Multiple Sclerosis (MS) and asthma.
• To investigate the potential causal relationship between Multiple Sclerosis (MS) and Chronic Obstructive Pulmonary Disease (COPD).

Main Methods:

• A two-sample Mendelian randomization (MR) study was conducted using genetic variation data from European genome-wide association studies (GWAS).
• Inverse Variance Weighted (IVW) was the primary analysis method, supported by weighted median, MR-Egger, and other MR techniques.
• Statistical tests including Cochran's Q, MR-Egger intercept, and MR-PRESSO were used to assess heterogeneity and horizontal pleiotropy.

Main Results:

• A nominally significant negative causal relationship was observed between MS and asthma in the training set (OR=0.969, P=0.004), but this was not replicated in the validation set (OR=1.010, P=0.428).
• No significant causal relationship was detected between MS and COPD in either the training or validation sets (P > 0.05).
• Analyses indicated no significant heterogeneity or horizontal pleiotropy, and leave-one-out analysis confirmed the robustness of the findings.

Conclusions:

• The findings suggest a potential, but not consistently confirmed, causal link between Multiple Sclerosis and asthma.
• There is no evidence of a causal relationship between Multiple Sclerosis and Chronic Obstructive Pulmonary Disease.
• This research provides insights into the complex interplay between neurological and respiratory conditions, potentially aiding in personalized treatment strategies for MS.