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The Effect of Acylcarnitines on Cognitive Function: A Two-Sample Mendelian Randomization Study.

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|July 3, 2025
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Summary
This summary is machine-generated.

Lower levels of butyrylcarnitine and acetyl-L-carnitine are linked to adverse neurocognitive effects, suggesting a causal relationship. Further research is needed to confirm these findings on cognitive function.

Keywords:
acylcarnitinesbrain structurecognitiondementia

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Genetics

Background:

  • Acylcarnitines play crucial roles in cellular metabolism.
  • Previous studies on acylcarnitines and cognitive function have produced inconsistent results.
  • Mendelian randomization (MR) offers a robust approach to investigate causal relationships.

Purpose of the Study:

  • To investigate the potential causal associations between 20 acylcarnitines and various neurocognitive outcomes using MR.
  • To examine the relationship between specific acylcarnitines and cognitive performance, intelligence, dementia risk, and brain structure.

Main Methods:

  • Utilized a two-sample Mendelian randomization (TSMR) approach.
  • Extracted single-nucleotide polymorphisms (SNPs) for 20 acylcarnitines from European ancestry genome-wide association studies (GWAS).
  • Performed TSMR to screen for acylcarnitines associated with cognitive performance and further analyzed associations with other cognitive outcomes, dementia, and brain structure.

Main Results:

  • Lower genetically predicted levels of butyrylcarnitine and acetyl-L-carnitine were associated with adverse neurocognitive effects.
  • Low butyrylcarnitine levels showed a negative correlation with cognitive function and intelligence.
  • No significant associations were found between these acylcarnitines and dementia or brain structure.

Conclusions:

  • Suggests a potential causal link between lower levels of acetyl-L-carnitine and butyrylcarnitine and adverse neurocognitive outcomes.
  • Highlights the need for large-scale, multicenter studies to validate these findings.
  • Provides insights into the metabolic underpinnings of cognitive health.