Genetic risk for schizophrenia and psychosis in Alzheimer disease

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  • A Correction to this article was published on 12 March 2019


Psychotic symptoms, defined as the occurrence of delusions or hallucinations, are frequent in Alzheimer disease (AD), affecting ~40 to 60% of individuals with AD (AD with psychosis (AD+P)). In comparison with AD subjects without psychosis, AD+P subjects have more rapid cognitive decline and poor outcomes. Prior studies have estimated the heritability of psychosis in AD at 61%, but the underlying genetic sources of this risk are not known. We evaluated a Discovery Cohort of 2876 AD subjects with (N=1761) or without psychosis (N=1115). All subjects were genotyped using a custom genotyping array designed to evaluate single-nucleotide polymorphisms (SNPs) with evidence of genetic association with AD+P and include SNPs affecting or putatively affecting risk for schizophrenia and AD. Results were replicated in an independent cohort of 2194 AD subjects with (N=734) or without psychosis (N=1460). We found that AD+P is associated with polygenic risk for a set of novel loci and inversely associated with polygenic risk for schizophrenia. Among the biologic pathways identified by the associations of schizophrenia SNPs with AD+P are endosomal trafficking, autophagy and calcium channel signaling. To the best of our knowledge, these findings provide the first clear demonstration that AD+P is associated with common genetic variation. In addition, they provide an unbiased link between polygenic risk for schizophrenia and a lower risk of psychosis in AD. This provides an opportunity to leverage progress made in identifying the biologic effects of schizophrenia alleles to identify novel mechanisms protecting against more rapid cognitive decline and psychosis risk in AD.

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This study was supported by the following federal grants: AG027224 (to RAS), AG005133 (to RAS), BX000452 (to RAS), MH057881 (to BD), AG030653 (to MIK), AG041718 (to MIK) and MH093723 (to ELS). This project used the University of Pittsburgh HSCRF Genomics Research Core iPlex and Specimen Processing services. Cardiff University was supported by the Wellcome Trust, Medical Research Council (MRC) and/or Alzheimer’s Research UK (ARUK) and the Welsh Assembly Government (to RS and JW).

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