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    Utility of an Alzheimer's Disease Risk-Weighted Polygenic Risk Score for Predicting Rates of Cognitive Decline in Preclinical Alzheimer's Disease: A Prospective Longitudinal Study.

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    Fulltext not available
    Authors
    Porter, T.
    Burnham, S.
    Milicic, L.
    Savage, G.
    Maruff, P.
    Lim, Y.
    Li, Q.
    Ames, D.
    Masters, C.
    Rainey-Smith, S.
    Rowe, C.
    Salvado, O.
    Groth, D.
    Verdile, Giuseppe
    Villemagne, V.
    Laws, S.
    AIBL Research Group
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Porter, T. and Burnham, S. and Milicic, L. and Savage, G. and Maruff, P. and Lim, Y. and Li, Q. et al. 2018. Utility of an Alzheimer's Disease Risk-Weighted Polygenic Risk Score for Predicting Rates of Cognitive Decline in Preclinical Alzheimer's Disease: A Prospective Longitudinal Study.. Journal of Alzheimer's Disease. 66 (3): pp. 1193-1211.
    Source Title
    Journal of Alzheimer's Disease
    DOI
    10.3233/JAD-180713
    ISSN
    1875-8908
    School
    School of Pharmacy and Biomedical Sciences
    URI
    http://hdl.handle.net/20.500.11937/72666
    Collection
    • Curtin Research Publications
    Abstract

    BACKGROUND: With the exception of APOE, genetic variants associated with increased Alzheimer's disease (AD) risk are characterized by small effect sizes. Polygenic risk scores (PRS) have shown utility in predicting AD risk; however, their utility for predicting decline in cognition at preclinical stages of AD is poorly understood. OBJECTIVE: To validate associations of a 22-variant AD-risk-weighted PRS with AD risk and related biomarkers and to assess its utility to predict cognitive decline. METHODS: The PRS was evaluated with respect to brain amyloid-ß (Aß) burden, cerebrospinal fluid (CSF) Aß42, total-tau, and phospho-tau, and decline in cognition in 643 (570 cognitively normal (CN), 73 AD) PET-imaged participants from the longitudinal Australian Imaging, Biomarkers and Lifestyle (AIBL) Study of Ageing. Cognition was assessed using three composite measures; global cognition, verbal episodic memory, and a Pre-Alzheimer's Cognitive Composite (PACC). RESULTS: PRS, both with and without APOE, were positively correlated with brain Aß burden, CSF total-tau, and phospho-tau in CN older adults. Further, in CN biomarker positive (Aßhigh) participants, significant associations were observed with baseline and longitudinal cognition. However, this association was not observed after the removal of APOE. Partitioning the PRS into quartiles revealed that the PRS associations with cognitive decline in Aßhigh CN older adults is due to a saturating effect of APOE genotype. CONCLUSIONS: An AD-risk-weighted PRS is associated with cognitive decline in CN older adults. However, this association is absent when APOE genotype is excluded from the PRS, suggesting that associations with cognitive decline in this model of polygenic risk are driven by APOE genotype alone. Further research is needed to define appropriate PRSs with greater utility for predicting preclinical AD cognitive decline.

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