Abstract:
:Genetic factors account for up to 80% of the liability for schizophrenia (SCZ) and bipolar disorder (BD). Genome-wide association studies have successfully identified several genes associated with increased risk for both disorders. This has allowed researchers to model the aggregate effect of genes associated with disease status and create a polygenic risk score (PGRS) for each individual. The interest in imaging genetics using PGRS has grown in recent years, with several studies now published. We have conducted a systematic review to examine the effects of PGRS of SCZ, BD and cross psychiatric disorders on brain function and connectivity using fMRI data. Results indicate that the effect of genetic load for SCZ and BD on brain function affects task-related recruitment, with frontal areas having a more prominent role, independent of task. Additionally, the results suggest that the polygenic architecture of psychotic disorders is not regionally confined but impacts on the task-dependent recruitment of multiple brain regions. Future imaging genetics studies with large samples, especially population studies, would be uniquely informative in mapping the spatial distribution of the genetic risk to psychiatric disorders on brain processes during various cognitive tasks and may lead to the discovery of biological pathways that could be crucial in mediating the link between genetic factors and alterations in brain networks.
journal_name
Brain Imaging Behavjournal_title
Brain imaging and behaviorauthors
Dezhina Z,Ranlund S,Kyriakopoulos M,Williams SCR,Dima Ddoi
10.1007/s11682-018-9879-zsubject
Has Abstractpub_date
2019-06-01 00:00:00pages
862-877issue
3eissn
1931-7557issn
1931-7565pii
10.1007/s11682-018-9879-zjournal_volume
13pub_type
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