Association Between Circulating Vitamin K Levels, Gut Microbiome, and Type 1 Diabetes: A Mendelian Randomization...

Area of Science:

• Endocrinology
• Nutritional Science
• Genetics

Background:

• Nutritional deficiencies are implicated in autoimmune diseases like type 1 diabetes (T1D).
• The role of Vitamin K (VK) in T1D pathogenesis is largely unknown, despite its potential benefits in type 2 diabetes.

Purpose of the Study:

• To investigate a potential causal relationship between Vitamin K (VK) levels and type 1 diabetes (T1D) risk.
• To explore the influence of VK and gut microbiota on T1D using a Mendelian randomization (MR) approach.

Main Methods:

• Utilized a two-sample Mendelian randomization (MR) study design.
• Employed genetic variants from a VK genome-wide association study (GWAS) as instrumental variables.
• Conducted multivariable MR (MVMR) to assess VK and gut microbiome effects on T1D risk.

Main Results:

• Univariate MR analysis showed no significant association between circulating VK levels and T1D risk.
• The study had limited power to detect small VK effects on T1D.
• MVMR revealed a suggestive association between VK and T1D risk when adjusting for gut microbiome populations.

Conclusions:

• Circulating Vitamin K (VK) levels are unlikely to be a major determinant of type 1 diabetes (T1D) risk.
• Small effects of VK on T1D cannot be ruled out.
• The interplay between VK and the gut microbiome warrants further investigation in relation to T1D.