Association between inflammatory bowel disease and frailty: a two-sample Mendelian randomization study

Area of Science:

• Genetics
• Gastroenterology
• Gerontology

Background:

• An association exists between inflammatory bowel disease (IBD) and frailty, but causality is unclear.
• Mendelian randomization (MR) is a robust method for investigating causal links between exposures and outcomes.
• This study utilizes a two-sample MR design to explore the relationship between IBD and frailty.

Purpose of the Study:

• To investigate the potential causal effect of inflammatory bowel disease (IBD) on frailty.
• To examine the potential causal effect of frailty on IBD, including Crohn's disease (CD) and ulcerative colitis (UC).

Main Methods:

• A bidirectional two-sample Mendelian randomization (MR) analysis was performed.
• Genome-wide association studies (GWAS) data for IBD (CD, UC) and frailty were used to select instrumental variables.
• Inverse-variance weighted (IVW) analysis was the primary method, supplemented by sensitivity analyses (weighted median, MR-Egger) to assess heterogeneity and pleiotropy.

Main Results:

• Increased genetic predisposition to frailty showed a causal effect on IBD risk (OR: 1.015).
• Both Crohn's disease (CD) and ulcerative colitis (UC) demonstrated an increased predisposition to frailty (CD OR: 1.018; UC OR: 1.016).
• Inverse MR analysis did not support a causal effect of frailty on IBD risk.

Conclusions:

• Inflammatory bowel disease (IBD), including CD and UC, may increase the risk of developing frailty.
• Early frailty assessment is recommended for IBD patients to enable proactive management.
• Current evidence does not support a causal role of frailty in the development of IBD, necessitating further research into underlying mechanisms.