Phosphorylated tau-Aβ42 ratio as a continuous trait for biomarker discovery for early-stage Alzheimer's disease in multiplex immunoassay panels of cerebrospinal fluid

Oscar Harari, Carlos Cruchaga, John S.K. Kauwe, Benjamin J. Ainscough, Kelly Bales, Eve H. Pickering, Sarah Bertelsen, Anne M. Fagan, David M. Holtzman, John C. Morris, Alison M. Goate

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Background Identification of the physiologic changes that occur during the early stages of Alzheimer's disease (AD) may provide critical insights for the diagnosis, prognosis, and treatment of disease. Cerebrospinal fluid (CSF) biomarkers are a rich source of information that reflect the brain proteome. Methods A novel approach was applied to screen a panel of ~190 CSF analytes quantified by multiplex immunoassay, and common associations were detected in the Knight Alzheimer's Disease Research Center (N = 311) and the Alzheimer's Disease Neuroimaging Initiative (N = 293) cohorts. Rather than case-control status, the ratio of CSF levels of tau phosphorylated at threonine 181 (ptau181) and Aβ42 was used as a continuous trait in these analyses. Results The ptau181-Aβ42 ratio has more statistical power than traditional modeling approaches, and the levels of CSF heart-type fatty acid binding protein (FABP) and 12 other correlated analytes increase as AD progresses. These results were validated using the traditional case-control status model. Stratification of the dataset demonstrated that increases in these analytes occur very early in the disease course and were apparent even in nondemented individuals with AD pathology (low ptau181, low Aβ42) compared with elderly control subjects with no pathology (low ptau181, high Aβ42). The FABP-Aβ42 ratio demonstrates a similar hazard ratio for disease conversion to ptau181-Aβ42 even though the overlap in classification is incomplete suggesting that FABP contributes independent information as a predictor of AD. Conclusions Our results indicate that the approach presented here can be used to identify novel biomarkers for AD correctly and that CSF heart FABP levels start to increase at very early stages of AD.

Original languageEnglish
Pages (from-to)723-731
Number of pages9
JournalBiological Psychiatry
Volume75
Issue number9
DOIs
StatePublished - May 1 2014

Keywords

  • Alzheimer's disease
  • biomarkers
  • brain proteome - Rules Based Medicine Discovery Multi-Analyte Profile 1.0
  • cerebrospinal fluid (CSF)
  • heart-type fatty acid binding protein

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