AUTHOR=Wu Dongpeng , Zhao Han , Gu Huali , Han Bin , Wang Qingqing , Man Xu , Zhao Renliang , Liu Xuejun , Sun Jinping 

TITLE=The Effects of rs405509 on APOEε4 Non-carriers in Non-demented Aging

JOURNAL=Frontiers in Neuroscience

VOLUME=15

YEAR=2021

URL=https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2021.677823

DOI=10.3389/fnins.2021.677823

ISSN=1662-453X

ABSTRACT=<sec><title>Background</title><p>There is evidence that the T allele of rs405509 located in the apolipoprotein E (<italic>APOE</italic>) promotor region is a risk factor for Alzheimer’s disease (AD). However, the effect of the T/T allele on brain function in non-demented aging is still unclear.</p></sec><sec><title>Methods</title><p>We analyzed the effects of the rs405509 T/T allele on cognitive performances using multiple neuropsychological tests and local brain function using resting-state functional magnetic resonance imaging (rs-fMRI).</p></sec><sec><title>Results</title><p>Significant differences were found between T/T carriers and G allele carriers on general cognitive status, memory, and attention (<italic>p</italic> &lt; 0.05). Rs-fMRI analyses demonstrated decreased amplitude of low frequency fluctuation (ALFF) in the right middle frontal gyrus, decreased percent amplitude of fluctuation (PerAF) in the right middle frontal gyrus, increased regional homogeneity (ReHo) in the right cerebellar tonsil and decreased ReHo in the right putamen, and decreased degree centrality (DC) in the left middle frontal gyrus (<italic>p</italic> &lt; 0.05, corrected). Furthermore, significant correlations were found between cognitive performance and these neuroimaging changes (<italic>p</italic> &lt; 0.05).</p></sec><sec><title>Conclusion</title><p>These findings suggest that T/T allele may serve as an independent risk factor that can influence brain function in different regions in non-demented aging.</p></sec>