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Causality between sarcopenia and diabetic nephropathy: a bidirectional Mendelian randomization study.

Linan Ren1, Yao Wang2, Feng Ju3

  • 1Department of Endocrinology and Metabolism, First Hospital of Jilin University, Changchun, Jilin, China.

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Summary

This study used Mendelian randomization to investigate the causal link between sarcopenia and diabetic nephropathy (DN). Reduced lean mass may increase DN risk, and DN may decrease grip strength, but an overall causal relationship was not established.

Keywords:
appendicular lean masscausalitydiabetic nephropathygrip strengthwalking speed

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Area of Science:

  • Genetics
  • Nephrology
  • Gerontology

Background:

  • Observational studies suggest a link between sarcopenia and diabetic nephropathy (DN).
  • The causal relationship between sarcopenia and DN remains unclear.
  • This study employs a bidirectional Mendelian randomization (MR) approach to investigate causality.

Purpose of the Study:

  • To determine if sarcopenia causally influences the risk of DN.
  • To investigate if DN causally affects components of sarcopenia.
  • To clarify the etiological relationship between sarcopenia and DN.

Main Methods:

  • Utilized genome-wide association study data for appendicular lean mass, grip strength, walking speed, and DN.
  • Conducted a forward MR analysis (sarcopenia to DN) and a reverse MR analysis (DN to sarcopenia).
  • Performed sensitivity analyses including heterogeneity, pleiotropy, and Leave-one-out tests for robust results.

Main Results:

  • Forward MR indicated that genetically predicted lower appendicular lean mass is associated with increased DN risk (OR = 0.863, P = 0.014).
  • Reverse MR showed that DN is associated with reduced grip strength (right: β = 0.003, P = 5.116e-06; left: β = 0.003, P = 7.035e-09).
  • Other MR analyses did not yield statistically significant results.

Conclusions:

  • While reduced appendicular lean mass may increase DN risk and DN may reduce grip strength, an overall causal link between sarcopenia and DN was not confirmed.
  • The complex nature of sarcopenia diagnosis, relying on multiple factors, precludes a generalized causal relationship with DN based on individual components.
  • Findings highlight specific associations but caution against generalizing a direct causal link between the two conditions.