Abstract
Offspring of parents with bipolar disorder (BD offspring) with subthreshold symptoms are particularly vulnerable to future disease onset, yet most of them remain clinically unaffected until adulthood, implicating potential compensatory processes. This longitudinal study (average 6-year follow-up) determined the brain surface features related to combined BD genetic and symptomatic risks, and tested whether the identified features related to mood disorder onset at follow-up. We found at baseline young BD offspring with subthreshold symptoms (N = 49, age 17.4 ± 5.9 years) showed higher cortical thickness in widespread regions than non-BD offspring with subthreshold symptoms (N = 47, age 16.9 ± 4.1 years), while those regions showed reduced cortical thickness in patients with BD (N = 51, age 17.7 ± 1.5 years) than healthy controls (N = 72, age 16.6 ± 3.3 years). Among those regions, the frontotemporal cortex showed reduced baseline cortical thickness among individuals who developed mood disorders at follow-up, compared with those who remained undiagnosed. Our findings provide important evidence on the brain surface features related to BD risk and potential compensatory processes.
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Data availability
The data included in this work are available in Supplementary Information. Further inquiry about the data can be addressed to the corresponding author (K.L., klin@gzhmu.edu.cn).
Code availability
MRI images were preprocessed using Freesurfer v. 7.2 (https://surfer.nmr.mgh.harvard.edu/). Surface registration utilized Workbench v. 1.5.0 (ref. 58). The ANCOVA model was constructed using Brainstat v. 0.4.2 (https://github.com/MICA-MNI/BrainStat). Parcel-wise significance testing was performed with BrainSmash v. 0.11.0 (ref. 62). MRI visualizations were generated using BrainSpace v. 0.1.10 (ref. 60).
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Acknowledgements
This project was supported by grants from the National Natural Science Foundation of China (82171531, 81671347), the Science and Technology Program of Guangzhou, China (202007030012) and the Guangzhou Municipal Key Discipline in Medicine (2021–2023) to K.L., grant from the National Natural Science Foundation of China (21921004) to J. Wang, grant from the National Natural Science Foundation of China (82102031) to J. Wu, grant from the National Natural Science Foundation of China (82371558) to R.S., and grant from the Guangzhou Health science and Technology general guidance project (no. 20221A011052) to W.L.
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W.L., R.S., G.X., S.Y., B.G., K.-F.S., J. Wang and K.L. conceptualized and designed the study. W.L., W.Z., R.Z., X.L., J.K., D.Z., X.T. and Y.G. performed data collection. J. Wu, R.S., J. Wang and K.L. analysed data and interpreted findings. W.L., J. Wu, R.S., J. Wang and K.L. drafted the manuscript. All authors reviewed and evaluated the manuscript. All authors contributed substantially to the intellectual contents of the manuscript.
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Lu, W., Wu, J., Shao, R. et al. Genetic and symptomatic risks associated with longitudinal brain morphometry in bipolar disorder. Nat. Mental Health 2, 209–217 (2024). https://doi.org/10.1038/s44220-023-00194-x
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DOI: https://doi.org/10.1038/s44220-023-00194-x