title: Molecular markers of early Parkinson's disease based on gene expression in blood.
abstract: Parkinson's disease (PD) progresses relentlessly and affects five million people worldwide. Laboratory tests for PD are critically needed for developing treatments designed to slow or prevent progression of the disease. We performed a transcriptome-wide scan in 105 individuals to interrogate the molecular processes perturbed in cellular blood of patients with early-stage PD. The molecular multigene marker here identified is associated with risk of PD in 66 samples of the training set comprising healthy and disease controls [third tertile cross-validated odds ratio of 5.7 (P for trend 0.005)]. It is further validated in 39 independent test samples [third tertile odds ratio of 5.1 (P for trend 0.04)]. Insights into disease-linked processes detectable in peripheral blood are offered by 22 unique genes differentially expressed in patients with PD versus healthy individuals. These include the co-chaperone ST13, which stabilizes heat-shock protein 70, a modifier of alpha-synuclein misfolding and toxicity. ST13 messenger RNA copies are lower in patients with PD (mean +/- SE 0.59 +/- 0.05) than in controls (0.96 +/- 0.09) (P = 0.002) in two independent populations. Thus, gene expression signals measured in blood can facilitate the development of biomarkers for PD.
authors.affiliation: Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, 65 Landsdowne Street, Cambridge, MA 02139, USA. cscherzer@rics.bwh.harvard.edu
authors.forename: Clemens R
authors.initials: CR
authors.lastname: Scherzer
authors.forename: Aron C
authors.initials: AC
authors.lastname: Eklund
authors.forename: Lee J
authors.initials: LJ
authors.lastname: Morse
authors.forename: Zhixiang
authors.initials: Z
authors.lastname: Liao
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Locascio
authors.forename: Daniel
authors.initials: D
authors.lastname: Fefer
authors.forename: Michael A
authors.initials: MA
authors.lastname: Schwarzschild
authors.forename: Michael G
authors.initials: MG
authors.lastname: Schlossmacher
authors.forename: Michael A
authors.initials: MA
authors.lastname: Hauser
authors.forename: Jeffery M
authors.initials: JM
authors.lastname: Vance
authors.forename: Lewis R
authors.initials: LR
authors.lastname: Sudarsky
authors.forename: David G
authors.initials: DG
authors.lastname: Standaert
authors.forename: John H
authors.initials: JH
authors.lastname: Growdon
authors.forename: Roderick V
authors.initials: RV
authors.lastname: Jensen
authors.forename: Steven R
authors.initials: SR
authors.lastname: Gullans
mesh_terms: D015415:Biomarkers / Q000097:blood; D015870:Gene Expression; D020869:Gene Expression Profiling; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics; D006801:Humans; D010300:Parkinson Disease / Q000097:blood* / Q000175:diagnosis / Q000235:genetics*; D012307:Risk Factors; D013997:Time Factors
chemical_list: D015415:Biomarkers; D018840:HSP70 Heat-Shock Proteins