Current Alzheimer Research

Debomoy K. Lahiri  
Department of Psychiatry, Indiana University School of Medicine
Neuroscience Research Center
Indianapolis, IN 46202
USA

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Pupil Response Biomarkers Distinguish Amyloid Precursor Protein Mutation Carriers from Non-Carriers

Author(s): Shaun M. Frost, Yogesan Kanagasingam, Hamid R. Sohrabi, Kevin Taddei, Randall Bateman, John Morris, Tammie Benzinger, Alison Goate, Colin L. Masters, Ralph N. Martins.

Abstract:

Context: Alzheimer’s disease (AD) is usually only diagnosed many years after pathology begins. Earlier detection would allow emerging interventions to have a greater chance to preserve healthy brain function. A rare form of Alzheimer’s disease, caused by autosomal-dominant mutations, affects carriers with 100% certainty and at a younger age specific to their mutation. Studying families with these mutations allows a unique investigation of the temporal sequence of biomarker changes in Alzheimer’s disease.

Objective: To determine whether the pupil flash response (PFR), previously reported to be altered in sporadic Alzheimer’s disease, is different in pre-symptomatic mutation carriers.

Design: Researchers blinded to participant mutation status collected pupil response data from cognitively normal participants in the Dominantly Inherited Alzheimer's Network (DIAN) Study during 2010-2011.

Setting: The pupil response was examined at the McCusker Alzheimer’s Research Foundation in Perth, Western Australia.

Participants: Participants were from a single family harboring an Amyloid-Beta Precursor Protein genetic mutation (APPGlu693Gln). Six carriers and six non-carriers were available for pupil testing (age 43.0±8.3 years old, 2 males and 10 females, 4 with hypertension).

Main Outcome Measure: Pupil response parameter comparison between mutation carriers and non-carriers.

Results: 75% recovery time was longer in mutation carriers (p<0.0003, ROC AUC 1.000, Sensitivity 100%, Specificity 100%) and percentage recovery 3.5 seconds after stimulus was less in mutation carriers (p<0.006, ROC AUC 1.000, Sensitivity 100%, Specificity 100%).

Conclusions: PFR changes occur pre-symptomatically in autosomal dominant AD mutation carriers, supporting further investigation of PFR for early detection of AD.

Keywords: Alzheimer’s, autosomal, amyloid, eye, pupil.

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Article Details

VOLUME: 10
ISSUE: 8
Year: 2013
Page: [790 - 796]
Pages: 7
DOI: 10.2174/15672050113109990154
Price: $58