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image of Causal Effects Between Neurodegenerative Diseases, Metabolites, and Brain Volume

Abstract

Introduction/Objective

Neurodegenerative diseases such as Alzheimer’s disease (AD), Lewy dody dementia (LBD), and Parkinson’s disease (PD) are linked to changes in brain volume. However, causal evidence on how these diseases affect brain volume and whether metabolites mediate these causal effects remains limited.

Methods

We applied mediation Mendelian randomization analysis using GWAS summary statistics. The inverse variance-weighted method was used to assess causal effects and identify potential metabolite mediators.

Results

The MR analyses indicated that bilateral thalamus and putamen volumes (FDR < 0.05) had causal effects on PD. AD and LBD showed causal effects on bilateral thalamus and hippocampus (FDR < 0.01), with LBD specifically showing a causal effect on bilateral putamen (FDR < 0.05). Mediation analyses revealed that AD had a genetically predicted association with Nervonoy-L-carnitine and 1-linoleoyl-2-arachidonoyl-GPC (-value = 0.04 and 0.01, respectively). Moreover, Nervonoy-L-carnitine was suggestively negatively associated with hippocampus volume (-value = 0.03 and 0.02, respectively). 1-linoleoyl-2-arachidonoyl-GPC exhibited a negative genetically predicted association with hippocampus volume (-value < 0.05). Additionally, LBD showed a negative genetically predicted association on the ratio of retinol to linoleoyl-arachidonoyl-glycerol (-value = 0.02), and a positive genetically predicted association on Nervonoy-L-carnitine (-value < 0.05) and 1-linoleoyl-2-arachidonoyl-GPC (-value = 0.03).

Discussion

These results suggest that AD and LBD affect brain regions through causal pathways. The involvement of specific metabolites highlights potential mechanisms linking neurodegeneration to brain volume.

Conclusion

Nervonoylcarnitine and 1-linoleoyl-2-arachidonoyl-GPC may mediate the predicted effects of AD and LBD on hippocampal volumes, while the ratio of retinol to linoleoyl-arachidonoyl-glycerol mediates only LBD.

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2026-01-21
2026-02-28

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Causal Effects Between Neurodegenerative Diseases, Metabolites, and Brain Volume
Bentham Science Publishers ; https://doi.org/10.2174/0115672050413060251107021634
/content/journals/car/10.2174/0115672050413060251107021634
/content/journals/car/10.2174/0115672050413060251107021634
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  • Article Type:     Research Article
Keywords: Parkinson’s disease ; lewy body dementia ; mediation analyses ; brain volume ; Alzheimer’s disease ; mendelian randomization ; Metabolites

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