title: Copy number deletion burden is associated with cognitive, structural, and resting-state network differences in patients with schizophrenia.
abstract: Total burden of copy number deletions has been implicated in schizophrenia risk and has been associated with reduced cognitive functioning. The current study aims to replicate the cognitive findings and investigate regional grey and white matter volumes. Moreover, it will explore resting-state networks for correlations between functional connectivity and total deletion burden. All imaging differences will be investigated for correlations with cognitive differences. Seventy-eight patients with chronic schizophrenia, who formed a subset of a large genome-wide association study (GWAS), were assessed for intelligence, 34 had structural magnetic resonance imaging, 33 had resting-state functional magnetic resonance imaging, and 32 had diffusion tensor imaging (DTI). Total deletion burden was negatively associated with IQ performance and positively associated with regional volumes in the striatum bilaterally and in the right superior temporal gyrus and white-matter in the corpus callosum. Correlations were identified between deletion burden and both hyper and hypoconnectivity within the default-mode network and hypoconnectivity within the cognitive control network. The functional connectivity correlations with deletion burden were also correlated with the IQ differences identified. Total deletion burden affects regional volumes and resting-state functional connectivity in key brain networks in patients with schizophrenia. Moreover, effects of deletions on cognitive functioning in may be due to inefficiency of key brain networks as identified by dysconnectivity in resting-state networks.
authors.affiliation: University of Queensland, Queensland Brain Institute, St Lucia Queensland 4072, Australia. Electronic address: a.martin11@uq.edu.au.
authors.forename: A K
authors.initials: AK
authors.lastname: Martin
authors.affiliation: University of Queensland, School of Psychology, St Lucia Queensland 4072, Australia. Electronic address: g.robinson@psy.uq.edu.au.
authors.forename: G
authors.initials: G
authors.lastname: Robinson
authors.affiliation: University of Queensland, Centre for Advanced Imaging, St Lucia Queensland 4072, Australia. Electronic address: cai_pa@uq.edu.au.
authors.forename: D
authors.initials: D
authors.lastname: Reutens
authors.affiliation: University of Queensland, Queensland Brain Institute, St Lucia Queensland 4072, Australia; University of Queensland, Queensland Centre for Mental Health Research, St Lucia Queensland, 4072, Australia. Electronic address: b.mowry@uq.edu.au.
authors.forename: B
authors.initials: B
authors.lastname: Mowry
mesh_terms: D001921:Brain / Q000473:pathology* / Q000503:physiopathology*; D001931:Brain Mapping; D056915:DNA Copy Number Variations; D056324:Diffusion Tensor Imaging; D005260:Female; D006801:Humans; D007360:Intelligence / Q000502:physiology*; D007361:Intelligence Tests; D008279:Magnetic Resonance Imaging; D008297:Male; D009434:Neural Pathways / Q000473:pathology / Q000503:physiopathology; D012146:Rest; D012559:Schizophrenia / Q000235:genetics / Q000473:pathology* / Q000503:physiopathology*; D012565:Schizophrenic Psychology; D017384:Sequence Deletion
keywords: Cognitive control; Copy number variation; DTI; Default mode network; Functional connectivity; IQ; Mutation; Schizophrenia; Striatum; Structural neuroimaging; VBM