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Cortical thickness and surface area in patients with obsessive compulsive disorder and their unaffected siblings

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Abstract

Little is known about the underlying neurobiological mechanisms in patients with obsessive-compulsive disorder (OCD). We aimed to examine cortical thickness and surface area in individuals with OCD and their unaffected siblings, comparing them to healthy controls. 30 patients with OCD, 21 unaffected siblings (SIB) and 30 controls underwent structural magnetic resonance imaging. Structural images were analyzed using the FreeSurfer software package (version 6.0). Compared to healthy controls, both OCD and SIB groups showed significantly lower cortical thickness in the right anterior insula. Surface areas of the superior frontal gyrus, paracentral gyrus and precuneus of the right hemisphere were also reduced in OCD patients compared to controls. There were no significant differences in cortical thickness and surface area between the OCD and SIB groups. We did not detect any significant differences in subcortical volumes between groups. Lower cortical thickness in the right anterior insula in both OCD patients and unaffected siblings may represent a potential structural endophenotype for OCD.

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Funding

This work was supported by Research Fund of Izmir Katip Celebi University (Project number: 2016-GAP-TIPF-0024) which had no role in the design of the study, collection and analysis of data and decision to publish.

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Contributions

NZ, ND, MK and LB made substantial contributions to the conception and the design of the work. FG, ED, AB and SP substantively helped with the data acquisition. NZ and ZK made substantial contributions to the analysis and interpretation of the data. LB, NZ and AZ have substantively revised the work.

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Correspondence to Nabi Zorlu.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Besiroglu, L., Zalesky, A., Kasal, M.I. et al. Cortical thickness and surface area in patients with obsessive compulsive disorder and their unaffected siblings. Brain Imaging and Behavior 16, 1946–1953 (2022). https://doi.org/10.1007/s11682-022-00660-7

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  • DOI: https://doi.org/10.1007/s11682-022-00660-7

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