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Individualized cortical thickness asymmetry in autism spectrum disorder and schizophrenia

Abstract

Cortical thickness asymmetry has been proposed as a latent biomarker for autism spectrum disorder (ASD) and schizophrenia (SZ). However, the degree of abnormal asymmetry at the individual level in ASD and SZ remains unclear. To investigate this, we employed a normative modeling approach. Normative ranges for the whole brain and regional (160 cortical parcels) cortical thickness asymmetry index (AI) were established using a training set of healthy subjects (n = 4904, 45.15% male, age range: 6–95 years), controlling for age, sex, image quality, and scanner. We calculated z-scores to quantify individual deviations from the normative median in a test set consisting of healthy controls (HCtest, n = 526, 40% male), participants with ASD (n = 135, 83% male), and SZ (n = 287, 81% male). Regional deviance was assessed by counting the number of individuals with significant deviations below (infra-normal, z-score ≤ −1.96) or above (supra-normal, z-score ≥ 1.96) the normative median in each parcel. We also evaluated individual deviance by counting the number of regions with significant deviations for each participant. A multivariate approach was employed to determine whether regional deviance could separate the three groups. There were no differences for deviance of whole brain AI between any of the groups. Distributions of individual deviances overlapped across all 160 regions, with one superior temporal region in which SZ individuals showed a higher proportion of supra-normal AI values compared to HCtest (HCtest = 1.14%, SZ = 5.92%, χ2 = 15.45, PFDR < 0.05, ω = 0.14). The SZ group had a higher average number of regions with significant deviations than HCtest (infra-normal: z = 4.21, p < 0.01; supra-normal: z = 4.33, p < 0.01) but this group difference had limited predictive diagnostic accuracy at the individual level (Area Under the Curve60%). The multivariate analysis showed no association between regional deviance and diagnosis. Results were consistent when using a different parcellation, alternative asymmetry calculations, analysis restricted to males, and after controlling for handedness and IQ. Normative modelling revealed little to no evidence of atypical individualized cortical thickness asymmetry in ASD and SZ. The results of this study challenge the utility of cortical thickness asymmetry as a biomarker for ASD and SZ.

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Fig. 1: Characterizing regional-level deviance in the Asymmetry Index (AI).
Fig. 2: The distributions of the normative modeling based z-scores for the whole brain AI in HCtest and each condition.
Fig. 3: Distribution of the number of regions with infra- or supra-normal deviance per individual.
Fig. 4: The optimum and three cluster results of k-medoid clustering applied to the 2D embedding of z-scores for regional cortical thickness AI, generated using tSNE (A1, A2).

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Data availability

In addition to non-publicly available datasets, the following publicly available datasets were used: Aomic (id1000, piop1 and piop2) available at https://openneuro.org/datasets/ds003097, https://openneuro.org/datasets/ds002785 and https://openneuro.org/datasets/ds002790; camcan available at https://camcan-archive.mrc-cbu.cam.ac.uk; dlbs available at https://fcon_1000.projects.nitrc.org/indi/retro/dlbs.html; ixi available at http://brain-development.org/ixidataset; narratives available at https://openneuro.org/datasets/ds002345; oasis3 available at www.oasis-brains.org; rockland available at https://rocklandsample.org/; sald available at https://fcon_1000.projects.nitrc.org/indi/retro/sald.html; ABIDE-I and II available at https://fcon_1000.projects.nitrc.org/indi/abide/; MITASD available at https://openneuro.org/datasets/ds000212/versions/1.0.0; WASHASD available at https://openneuro.org/datasets/ds002522/versions/1.0.0; BGS available at http://schizconnect.org/; COBRE available at http://schizconnect.org/.

Code availability

All code used to perform the analyses can be found at https://github.com/iamjoostjanssen/NormModel_AI_SZ_ASD.

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Acknowledgements

Supported by the Spanish Ministry of Science and Innovation, Instituto de Salud Carlos III (ISCIII), CIBER -Consorcio Centro de Investigación Biomédica en Red- (CB/07/09/0023), co-financed by the European Union, ERDF Funds from the European Commission, “A way of making Europe”, (PI16/02012, PI17/01249, PI17/00997, PI19/01024, PI20/00721, PI22/01824, PI22/01621, PI23/00625), financed by the European Union - NextGenerationEU (PMP21/00051), Madrid Regional Government (S2022/BMD-7216 AGES 3-CM), European Union Seventh Framework Program, European Union H2020 Program under the Innovative Medicines Initiative 2 Joint Undertaking: Project PRISM-2 (Grant agreement No.101034377), Project COllaborative Network for European Clinical Trials For Children “c4c” (Grant agreement No 777389) Horizon Europe, the National Institute of Mental Health of the National Institutes of Health under Award Number 1U01MH124639-01 (Project ProNET), Award Number 5P50MH115846-03 (Project FEP-CAUSAL) and Award Number 1R01MH128971-01A1 (Project SZ-aging), Fundación Familia Alonso, and Fundación Alicia Koplowitz. The results leading to this publication have received funding from the Innovative Medicines Initiative 2 Joint Undertaking under grant agreement No 777394 for the project AIMS-2-TRIALS. This Joint Undertaking receives support from the European Union’s Horizon 2020 research and innovation programme and EFPIA and AUTISM SPEAKS, Autistica, SFARI. Any views expressed are those of the author(s) and not necessarily those of the funders (IHI-JU2). The authors thank Yasser Alemán-Goméz, Alberto Fernández Pena, Zimbo Boudewijns, and Joyce van Baaren for code and technical assistance.

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Substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work: Joost Janssen, Marta Martín Echave, Hugo G. Schnack, Covadonga M. Díaz-Caneja. Drafting the work or revising it critically for important intellectual content: Joost Janssen, Marta Martín Echave, Hugo G. Schnack, Pedro M. Gordaliza, Neeltje E.M. van Haren, Celso Arango. Final approval of the version to be published: Joost Janssen, Marta Martín Echave, Covadonga M. Díaz-Caneja, Niels Janssen, Pedro M. Gordaliza, Elizabeth E.L. Buimer, Neeltje E.M. van Haren, Wiepke Cahn, Celso Arango, René S. Kahn, Hilleke E. Hulshoff Pol, Hugo G. Schnack. Agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved: Joost Janssen, Marta Martín Echave, Hugo G. Schnack.

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Correspondence to Joost Janssen.

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No authors declare any competing financial interests in relation to the work described. Dr. Díaz-Caneja has received honoraria from Angelini and Viatris. Dr. Arango has been a consultant to or has received honoraria or grants from Acadia, Angelini, Gedeon Richter, Janssen-Cilag, Lundbeck, Otsuka, Roche, Sage, Servier, Shire, Schering-Plough, Sumitomo Dainippon Pharma, Sunovion, and Takeda. Dr. Cahn has received unrestricted research grants from or served as an independent symposium speaker or consultant for Eli Lilly, Bristol-Myers Squibb, Lundbeck, Sanofi-Aventis, Janssen-Cilag, AstraZeneca, and Schering-Plough. The other authors report no financial relationships with commercial interests.

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All methods were performed in accordance with the relevant guidelines and regulations. All sites obtained local institutional review board approval. Written informed consent was obtained from every participant, or from the participant’s guardian for minors. All studies were conducted in accordance with the Declaration of Helsinki.

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Martín Echave, M., Schnack, H.G., Díaz-Caneja, C.M. et al. Individualized cortical thickness asymmetry in autism spectrum disorder and schizophrenia. Mol Psychiatry (2025). https://doi.org/10.1038/s41380-025-03359-5

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