Mendelian randomization analysis reveals causal relationships between circulating cell traits and renal disorders

Area of Science:

• Genetics
• Nephrology
• Hematology

Background:

• Circulating cell traits are crucial indicators of overall health.
• Understanding their causal links to renal disorders can improve patient outcomes.
• Mendelian randomization offers a robust method to explore these genetic associations.

Purpose of the Study:

• To investigate the causal relationships between circulating cell traits and the risk of developing renal disorders.
• To identify specific blood cell types that may serve as predictive markers for kidney diseases.

Main Methods:

• A two-sample Mendelian randomization (MR) analysis was performed using publicly available genome-wide association study (GWAS) data.
• Instrumental variables for blood cell traits were sourced from the Blood Cell Consortium (BCX).
• Renal disease data were obtained from the Finngen consortium, with inverse variance weighted (IVW) and other MR methods applied for analysis and sensitivity testing.

Main Results:

• Increased white blood cell (WBC) count and lymphocyte count were causally associated with a higher risk of IgA nephropathy.
• WBC count was also identified as a significant genetic risk factor for renal malignant neoplasms.
• Elevated eosinophil counts showed a causal association with an increased risk of diabetic nephropathy.

Conclusions:

• The study provides evidence for causal links between specific circulating cell traits and key renal disorders, including IgA nephropathy, renal malignant neoplasms, and diabetic nephropathy.
• These findings may inform the development of novel diagnostic tools and therapeutic strategies for kidney diseases.
• No significant horizontal pleiotropy was detected, strengthening the validity of the causal inferences.