Apolipoprotein E and alpha brain rhythms in mild cognitive impairment: A multicentric Electroencephalogram study
Article first published online: 15 DEC 2005
Copyright © 2005 American Neurological Association
Annals of Neurology
Volume 59, Issue 2, pages 323–334, February 2006
How to Cite
Babiloni, C., Benussi, L., Binetti, G., Cassetta, E., Dal Forno, G., Del Percio, C., Ferreri, F., Ferri, R., Frisoni, G., Ghidoni, R., Miniussi, C., Rodriguez, G., Romani, G. L., Squitti, R., Ventriglia, M. C. and Rossini, P. M. (2006), Apolipoprotein E and alpha brain rhythms in mild cognitive impairment: A multicentric Electroencephalogram study. Ann Neurol., 59: 323–334. doi: 10.1002/ana.20724
- Issue published online: 25 JAN 2006
- Article first published online: 15 DEC 2005
- Manuscript Accepted: 8 SEP 2005
- Manuscript Revised: 7 SEP 2005
- Manuscript Received: 18 MAR 2005
Relationships between the apolipoprotein E ε4 allele and electroencephalographic (EEG) rhythmicity have been demonstrated in Alzheimer's disease (AD) patients but not in the preclinical stage prodromic to it, namely, mild cognitive impairment (MCI). The present multicentric EEG study tested the hypothesis that presence of ε4 affects sources of resting EEG rhythms in both MCI and AD subjects.
We enrolled 89 MCI subjects (34.8% with ε4) and 103 AD patients (50.4% with ε4). Resting eyes-closed EEG data were recorded for all subjects. EEG rhythms of interest were delta (2—4Hz), theta (4–8Hz), alpha 1 (8–10.5Hz), alpha 2 (10.5–13Hz), beta 1 (13–20Hz), and beta 2 (20–30Hz). EEG cortical sources were estimated by low-resolution brain electromagnetic tomography.
Results showed that amplitude of alpha 1 and 2 sources in occipital, temporal, and limbic areas was lower in subjects carrying the ε4 allele than in those not carrying the ε4 allele (p < 0.01). This was true for both MCI and AD. For the first time to our knowledge, a relationship was shown between ApoE genotype and global neurophysiological phenotype (ie, cortical alpha rhythmicity) in a preclinical AD condition, MCI, in addition to clinically manifest AD.
Such a demonstration motivates future genotype–EEG phenotype studies for the early prediction of AD conversion in individual MCI subjects. Ann Neurol 2005