Abstract
Patients with major depressive disorder (MDD) exhibit concurrent deficits in both sensory and higher-order cognitive processing. Connectome studies have suggested a principal primary-to-transmodal gradient in functional brain networks, supporting the spectrum from sensation to cognition. However, whether this gradient structure is disrupted in patients with MDD and how this disruption associates with gene expression profiles and treatment outcome remain unknown. Using a large cohort of resting-state fMRI data from 2227 participants (1148 MDD patients and 1079 healthy controls) recruited at nine sites, we investigated MDD-related alterations in the principal connectome gradient. We further used Neurosynth, postmortem gene expression, and an 8-week antidepressant treatment (20 MDD patients) data to assess the meta-analytic cognitive functions, transcriptional profiles, and treatment outcomes related to MDD gradient alterations, respectively. Relative to the controls, MDD patients exhibited global topographic alterations in the principal primary-to-transmodal gradient, including reduced explanation ratio, gradient range, and gradient variation (Cohen’s d = 0.16–0.21), and focal alterations mainly in the primary and transmodal systems (d = 0.18–0.25). These gradient alterations were significantly correlated with meta-analytic terms involving sensory processing and higher-order cognition. The transcriptional profiles explained 53.9% variance of the altered gradient pattern, with the most correlated genes enriched in transsynaptic signaling and calcium ion binding. The baseline gradient maps of patients significantly predicted symptomatic improvement after treatment. These results highlight the connectome gradient dysfunction in MDD and its linkage with gene expression profiles and clinical management, providing insight into the neurobiological underpinnings and potential biomarkers for treatment evaluation in this disorder.
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Data availability
The core analysis code and resulting data are publicly available at github.com/mingruixia/MDD_ConnectomeGradient. For details of Materials and Methods, see Supplementary Material.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (82071998 and 81671767 to MX; 82021004, 81620108016, and 91432115 to YH; 81171286 and 91232714 to LL; 31771231 and 31271087 to JQ; 81571331 to FW; 81271499 and 81571311 to YT; 81920108019 and 81771344 to SQ; 81630031 to TS; 81621003 to QG; 81660237 to XX), the Beijing Nova Program (Z191100001119023 to MX), Fundamental Research Funds for the Central Universities (2020NTST29 to MX), the National Key R&D Program of China (2018YFA0701400 to YH), the Changjiang Scholar Professorship Award (T2015027 to YH), the National Science and Technologic Program of China (2015BAI13B02 to LL), the National Basic Research Program of China (2013CB835100 LL), the Natural Science Foundation of Chongqing (cstc2019jcyj-msxmX0520 to JQ), the National High Tech Development Plan (863) (2015AA020513 to FW), the Medical Science and Technology Research Project of Henan Province (201701011 to JC), and Shanghai Science and Technology Innovation Plan (17JC1404105 and 17JC1404101 to C-PL). The authors thank the Allen Institute for Brain Science for providing the gene expression data.
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MX and YH designed research; XW, DW, YChen, BL, C-CH, YZ, YW, TC, YCheng, XX, QG, TS, SQ, C-PL, JC, YT, FW, JQ, PX, and LL collected data; MX, XS, and QM performed data quality control; MX and JL analyzed data; and MX, JL, AM, and YH, wrote the paper.
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Xia, M., Liu, J., Mechelli, A. et al. Connectome gradient dysfunction in major depression and its association with gene expression profiles and treatment outcomes. Mol Psychiatry 27, 1384–1393 (2022). https://doi.org/10.1038/s41380-022-01519-5
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DOI: https://doi.org/10.1038/s41380-022-01519-5
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