Causal association between metabolic syndrome and cholelithiasis: a Mendelian randomization study

Area of Science:

• Genetics and Epidemiology
• Gastroenterology
• Metabolic Diseases

Background:

• Observational studies suggest a link between metabolic syndrome (MetS) and cholelithiasis (gallstones).
• The causal relationship between MetS and gallstone formation remains incompletely understood.
• This study investigates the causal effect of MetS on cholelithiasis using Mendelian randomization.

Purpose of the Study:

• To determine if metabolic syndrome (MetS) causally influences the risk of developing gallstones (cholelithiasis).
• To explore the specific contributions of MetS components to gallstone incidence.
• To provide evidence-based recommendations for gallstone prevention through MetS management.

Main Methods:

• Utilized Mendelian randomization (MR) analysis with single nucleotide polymorphisms (SNPs) associated with MetS and its components.
• Employed inverse variance weighting (IVW), weighted median, and MR-Egger regression methods.
• Conducted sensitivity analyses to validate the robustness of the findings.

Main Results:

• Metabolic syndrome (MetS) was found to significantly increase the risk of cholelithiasis (gallstones) (OR = 1.28, P = 9.70E-05).
• Waist circumference, a key indicator of abdominal obesity within MetS, showed a strong association with increased gallstone risk (OR = 1.48, P = 1.15E-13).
• Consistent results were observed across different MR analysis methods, confirming the causal link.

Conclusions:

• Metabolic syndrome (MetS) is a causal risk factor for gallstone (cholelithiasis) development.
• Abdominal obesity is a significant driver of this increased risk in MetS patients.
• Effective management and treatment of MetS are crucial for reducing gallstone incidence.