Circadian and wake-dependent changes in human plasma polar metabolites during prolonged wakefulness: A preliminary analysis
AuthorGrant, LK; Ftouni, S; Nijagal, B; De Souza, DP; Tull, D; McConville, MJ; Rajaratnam, SMW; Lockley, SW; Anderson, C
Source TitleScientific Reports
PublisherNATURE PUBLISHING GROUP
University of Melbourne Author/sde Souza, David; Nijagal, Brunda; Tull, Dedreia; McConville, Malcolm
Biochemistry and Molecular Biology
Document TypeJournal Article
CitationsGrant, L. K., Ftouni, S., Nijagal, B., De Souza, D. P., Tull, D., McConville, M. J., Rajaratnam, S. M. W., Lockley, S. W. & Anderson, C. (2019). Circadian and wake-dependent changes in human plasma polar metabolites during prolonged wakefulness: A preliminary analysis. SCIENTIFIC REPORTS, 9 (1), https://doi.org/10.1038/s41598-019-40353-8.
Access StatusOpen Access
Establishing circadian and wake-dependent changes in the human metabolome are critical for understanding and treating human diseases due to circadian misalignment or extended wake. Here, we assessed endogenous circadian rhythms and wake-dependent changes in plasma metabolites in 13 participants (4 females) studied during 40-hours of wakefulness. Four-hourly plasma samples were analyzed by hydrophilic interaction liquid chromatography (HILIC)-LC-MS for 1,740 metabolite signals. Group-averaged (relative to DLMO) and individual participant metabolite profiles were fitted with a combined cosinor and linear regression model. In group-level analyses, 22% of metabolites were rhythmic and 8% were linear, whereas in individual-level analyses, 14% of profiles were rhythmic and 4% were linear. We observed metabolites that were significant at the group-level but not significant in a single individual, and metabolites that were significant in approximately half of individuals but not group-significant. Of the group-rhythmic and group-linear metabolites, only 7% and 12% were also significantly rhythmic or linear, respectively, in ≥50% of participants. Owing to large inter-individual variation in rhythm timing and the magnitude and direction of linear change, acrophase and slope estimates also differed between group- and individual-level analyses. These preliminary findings have important implications for biomarker development and understanding of sleep and circadian regulation of metabolism.
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