Exploring the causal relationship between inflammatory bowel disease and sarcopenia-related traits: a two-sample...

Area of Science:

• Genetics
• Gastroenterology
• Musculoskeletal Health

Background:

• Observational studies suggest a link between inflammatory bowel disease (IBD) and sarcopenia.
• The causal relationship between IBD (ulcerative colitis, Crohn's disease) and sarcopenia requires further investigation.

Purpose of the Study:

• To determine if genetically predicted IBD influences sarcopenia development using Mendelian randomization (MR).
• To assess the causal effect of IBD on sarcopenia-related traits: hand grip strength, walking pace, and appendicular lean mass (ALM).

Main Methods:

• Utilized independent single nucleotide polymorphisms (SNPs) associated with IBD as instrumental variables (IVs).
• Employed Inverse Variance Weighted (IVW) MR analysis with summary-level data from the UK Biobank for sarcopenia traits.
• Conducted sensitivity analyses to confirm the robustness of the findings.

Main Results:

• Genetically predicted IBD showed significant negative associations with hand grip strength and ALM.
• A causal relationship was identified between Crohn's disease and reduced hand grip strength and ALM.
• No significant causal associations were found between ulcerative colitis and sarcopenia-related traits.

Conclusions:

• Crohn's disease has a causal effect on hand grip strength and appendicular lean mass.
• Crohn's disease may represent a significant risk factor for developing sarcopenia.