Document Detail


Apolipoprotein E epsilon4 allele decreases functional connectivity in Alzheimer's disease as measured by EEG coherence.
MedLine Citation:
PMID:  9221969     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: The epsilon4 allele of apolipoprotein E (APOE) represents a major biological risk factor for late onset Alzheimer's disease. However, it is still not known whether the APOE genotype affects the progression of the disease, assessed by different functional methods. METHODS: The study sample included 41 patients with probable Alzheimer's disease. Subjects had similar severity of disease, age of onset, and duration of illness, and were subcategorised according to their APOE genotypes: 17 with no epsilon4 allele, 14 with one epsilon4 allele, and 10 with two epsilon4 alleles. The control group consisted of 18 healthy subjects comparable with the patients in age and education. Analysed quantitative EEG (qEEG) variables were the ratio of alpha and theta absolute power and EEG coherence in alpha frequency band, representing major cortical association pathways. RESULTS: There was pronounced EEG slowing in all three patient subgroups compared with the controls for the alpha/theta ratio, but there was no significant difference across the patient subgroups. Patients homozygous for the APOE epsilon4 allele had reduced right and left temporoparietal, right temporofrontal, and left occipitoparietal coherence. Patients without and with one epsilon4 allele showed an overlap between the control group and group with two epsilon4 alleles in coherence measures. CONCLUSIONS: APOE epsilon4 does not influence EEG slowing, an index which reflects severity of the disease in patients with Alzheimer's disease, but seems to be associated with selective decreases in functional connectivity as assessed by EEG coherence. This finding might be of clinical importance when considering different pathogenetic mechanisms.
Authors:
V Jelic; P Julin; M Shigeta; A Nordberg; L Lannfelt; B Winblad; L O Wahlund
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of neurology, neurosurgery, and psychiatry     Volume:  63     ISSN:  0022-3050     ISO Abbreviation:  J. Neurol. Neurosurg. Psychiatr.     Publication Date:  1997 Jul 
Date Detail:
Created Date:  1997-07-24     Completed Date:  1997-07-24     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  2985191R     Medline TA:  J Neurol Neurosurg Psychiatry     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  59-65     Citation Subset:  IM    
Affiliation:
Department of Clinical Neuroscience and Family Medicine, Karolinska Institute, Stockholm, Sweden.
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MeSH Terms
Descriptor/Qualifier:
Age of Onset
Aged
Alleles
Alpha Rhythm
Alzheimer Disease / diagnosis*,  genetics*,  physiopathology
Apolipoprotein E4
Apolipoproteins E / genetics*
Cerebral Cortex / physiopathology*
Electroencephalography*
Female
Functional Laterality
Genotype
Humans
Male
Middle Aged
Theta Rhythm
Chemical
Reg. No./Substance:
0/Apolipoprotein E4; 0/Apolipoproteins E
Comments/Corrections

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