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Blood DNA methylation signatures to detect dementia prior to overt clinical symptoms.


ABSTRACT: Introduction:This study determined whether blood DNA methylation (DNAm) patterns differentiate individuals with presymptomatic dementia compared to controls. Methods:DNAm was measured in 73 individuals prior to dementia diagnosis and 87 cognitively healthy controls matched for age, sex, smoking, education, and baseline cognition. DNAm was also measured at 3 years follow-up in 25 dementia cases, and 24 controls. Results:Cases and controls differed in DNAm (unadjusted P < .01) at the time of diagnosis (n = 28,787 probes), and pre-diagnosis (n = 15,111 probes), with cg01404610 (General transcription factor IIA subunit 1 gene) significant after correction for multiple testing. Overall, 1150 probes overlapped between analyses (methylation differences from -10.6% to +11.0%), and effect sizes increased from pre-diagnosis to diagnosis. Discussion:Discernible blood DNAm signatures are in dementia cases before the appearance of overt clinical symptoms. Blood-based methylation may serve as a potential biomarker of dementia, but further investigation is needed to determine their true clinical utility.

SUBMITTER: Fransquet PD 

PROVIDER: S-EPMC7346866 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Blood DNA methylation signatures to detect dementia prior to overt clinical symptoms.

Fransquet Peter Daniel PD   Lacaze Paul P   Saffery Richard R   Phung James J   Parker Emily E   Shah Raj R   Murray Anne A   Woods Robyn L RL   Ryan Joanne J  

Alzheimer's & dementia (Amsterdam, Netherlands) 20200709 1


<h4>Introduction</h4>This study determined whether blood DNA methylation (DNAm) patterns differentiate individuals with presymptomatic dementia compared to controls.<h4>Methods</h4>DNAm was measured in 73 individuals prior to dementia diagnosis and 87 cognitively healthy controls matched for age, sex, smoking, education, and baseline cognition. DNAm was also measured at 3 years follow-up in 25 dementia cases, and 24 controls.<h4>Results</h4>Cases and controls differed in DNAm (unadjusted <i>P</i  ...[more]

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