Abstract
Visceral adiposity has been associated with altered microstructural properties of white matter in adolescents. Previous evidence suggests that circulating phospholipid PC(16:0/2:0) may mediate this association. To investigate the underlying biology, we performed a genome-wide association study (GWAS) of the shared variance of visceral fat, PC(16:0/2:0), and white matter microstructure in 872 adolescents from the Saguenay Youth Study. We further studied the metabolomic profile of the GWAS-lead variant in 931 adolescents. Visceral fat and white matter microstructure were assessed with magnetic resonance imaging. Circulating metabolites were quantified with serum lipidomics and metabolomics. We identified a genome-wide significant association near DHCR24 (Seladin-1) encoding a cholesterol-synthesizing enzyme (rs588709, p = 3.6 × 10−8); rs588709 was also associated nominally with each of the three traits (white matter microstructure: p = 2.1 × 10−6, PC(16:0/2:0): p = 0.005, visceral fat: p = 0.010). We found that the metabolic profile associated with rs588709 resembled that of a TM6SF2 variant impacting very low-density lipoprotein (VLDL) secretion and was only partially similar to that of a HMGCR variant. This suggests that the effect of rs588709 on VLDL lipids may arise due to altered phospholipid rather than cholesterol metabolism. The rs588709 was also nominally associated with circulating concentrations of omega-3 fatty acids in interaction with visceral fat and PC(16:0/2:0), and these fatty acid measures showed robust associations with white matter microstructure. Overall, the present study provides evidence that the DHCR24 locus may link peripheral metabolism to brain microstructure, an association with implications for cognitive impairment.
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Acknowledgements
The authors thank the following individuals for their contributions in data acquisition and storage in the SYS: Manon Bernard (database architect, The Hospital for Sick Children), Hélène Simard and her team of research assistants (Cégep de Jonquière), and Jacynthe Tremblay and her team of research nurses (Chicoutimi Hospital). The authors thank all participants who took part in the Saguenay Youth Study. The Genotype-Tissue Expression (GTEx) Project was supported by the Common Fund of the Office of the Director of the National Institutes of Health, and by NCI, NHGRI, NHLBI, NIDA, NIMH, and NINDS. The data used for the analyses described in this manuscript were obtained from the GTEx Portal on 04/01/2019 and dbGaP accession number phs000424.v7.p2 on 04/01/2019.
Funding
The Saguenay Youth Study has been funded by the Canadian Institutes of Health Research (TP and ZP), Heart and Stroke Foundation of Canada (ZP), Canadian Foundation for Innovation (ZP), and National Institutes for Health (ZP).
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Sliz, E., Shin, J., Syme, C. et al. A variant near DHCR24 associates with microstructural properties of white matter and peripheral lipid metabolism in adolescents. Mol Psychiatry 26, 3795–3805 (2021). https://doi.org/10.1038/s41380-019-0640-9
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DOI: https://doi.org/10.1038/s41380-019-0640-9
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