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Neurobiol Aging. 2017 May;53:103-111. doi: 10.1016/j.neurobiolaging.2017.01.024. Epub 2017 Feb 9.

Excessive tau accumulation in the parieto-occipital cortex characterizes early-onset Alzheimer's disease.

Author information

1
Department of Neurology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
2
Department of Nuclear Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
3
Department of Neurology, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea. Electronic address: lyoochel@yuhs.ac.

Abstract

Early-onset Alzheimer's disease (EOAD) is characterized by greater nonmemory dysfunctions, more rapid progression, and greater hypometabolism and atrophy than late-onset AD (LOAD). We sought to investigate the differences in tau accumulation patterns between early- and late-onset patients with AD and mild cognitive impairment (MCI). In 90 patients who completed 18F-AV-1451 and 18F-florbetaben positron emission tomography scans, only 59 amyloid-positive patients (11 EOAD, 10 EOMCI, 21 LOAD, and 17 LOMCI) were included in this study. We compared cortical 18F-AV-1451 binding between each patient group and corresponding amyloid-negative age-matched controls. In contrast to no difference in cortical binding between the EOMCI and LOMCI groups, EOAD showed greater binding in the parieto-occipital cortex than LOAD. The parieto-occipital binding correlated with visuospatial dysfunction in the EOAD spectrum, whereas binding in the temporal cortex correlated with verbal memory dysfunction in the LOAD spectrum. Our findings suggest that distinct topographic distribution of tau may influence the nature of cognitive impairment in EOAD patients.

KEYWORDS:

Alzheimer's disease; Early onset; Mild cognitive impairment; Positron emission tomography; Tau

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