The causal relationship between chronic obstructive pulmonary disease and Barrett's esophagitis: A two-sample...

Area of Science:

• Epidemiology
• Genetics
• Gastroenterology

Background:

• Chronic obstructive pulmonary disease (COPD) and Barrett's esophagus (BE) are significant public health concerns with complex etiologies.
• Previous research has explored potential associations, but a definitive causal link remains unclear.

Purpose of the Study:

• To investigate the bidirectional causal relationship between COPD and BE using a robust genetic approach.
• To identify whether genetic predisposition to COPD influences the risk of developing BE, and vice versa.

Main Methods:

• Two-sample Mendelian randomization (MR) analysis utilizing summary-level genome-wide association study data.
• Selection of significant single nucleotide polymorphisms (SNPs) as instrumental variables for COPD and BE.
• Application of various MR methods including Inverse Variance Weighted (IVW), weighted median, and MR-Egger analyses to assess causality and pleiotropy.

Main Results:

• A significant bidirectional causal effect was observed between COPD and BE.
• COPD was found to increase the risk of BE (OR: 1.24, P < 0.0001), with consistent findings across multiple MR methods.
• BE was also found to increase the risk of COPD (OR: 1.08, P = 0.001), supported by weighted median analysis.
• Pleiotropy analyses confirmed the robustness of these findings.

Conclusions:

• The study establishes a bidirectional causal relationship between COPD and BE.
• These findings underscore the need for further research into the underlying biological mechanisms connecting these two conditions.
• The identified causal links have implications for targeted screening, prevention strategies, and clinical management of patients with either COPD or BE.