Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults
The resource modulation hypothesis suggests that the influence of genes on cognitive functioning increases with age. The KIBRA single nucleotide polymorphism rs17070145, associated with episodic memory and working memory, has been suggested to follow such a pattern, but few studies have tested this...
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doaj-5a7c8ba0ad1e44009ffbb321b6943be22020-11-24T20:58:12ZengFrontiers Media S.A.Frontiers in Aging Neuroscience1663-43652018-01-01910.3389/fnagi.2017.00431289142Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older AdultsAriana Stickel0Kevin Kawa1Katrin Walther2Elizabeth Glisky3Ryan Richholt4Matt Huentelman5Lee Ryan6Cognition and Neuroimaging Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United StatesCognition and Neuroimaging Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United StatesEpilepsy Center Erlangen, Department of Neurology, University Hospital Erlangen, Erlangen, GermanyAging and Cognition Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United StatesNeurogenomics Division, The Translational Genomics Research Institute, Phoenix, AZ, United StatesNeurogenomics Division, The Translational Genomics Research Institute, Phoenix, AZ, United StatesCognition and Neuroimaging Laboratory, Department of Psychology, University of Arizona, Tucson, AZ, United StatesThe resource modulation hypothesis suggests that the influence of genes on cognitive functioning increases with age. The KIBRA single nucleotide polymorphism rs17070145, associated with episodic memory and working memory, has been suggested to follow such a pattern, but few studies have tested this assertion directly. The present study investigated the relationship between KIBRA alleles (T carriers vs. CC homozygotes), cognitive performance, and brain volumes in three groups of cognitively healthy adults—middle aged (ages 52–64, n = 38), young old (ages 65–72, n = 45), and older old (ages 73–92, n = 62)—who were carefully matched on potentially confounding variables including apolipoprotein ε4 status and hypertension. Consistent with our prediction, T carriers maintained verbal memory performance with increasing age while CC homozygotes declined. Voxel-based morphometric analysis of magnetic resonance images showed an advantage for T carriers in frontal white matter volume that increased with age. Focusing on the older old group, this advantage for T carriers was also evident in left lingual gyrus gray matter and several additional frontal white matter regions. Contrary to expectations, neither KIBRA nor the interaction between KIBRA and age predicted hippocampal volumes. None of the brain regions investigated showed a CC homozygote advantage. Taken together, these data suggest that KIBRA results in decreased verbal memory performance and lower brain volumes in CC homozygotes compared to T carriers, particularly among the oldest old, consistent with the resource modulation hypothesis.http://journal.frontiersin.org/article/10.3389/fnagi.2017.00431/fullKIBRAbrain volumesage-interactionscognitionresource modulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ariana Stickel Kevin Kawa Katrin Walther Elizabeth Glisky Ryan Richholt Matt Huentelman Lee Ryan |
spellingShingle |
Ariana Stickel Kevin Kawa Katrin Walther Elizabeth Glisky Ryan Richholt Matt Huentelman Lee Ryan Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults Frontiers in Aging Neuroscience KIBRA brain volumes age-interactions cognition resource modulation |
author_facet |
Ariana Stickel Kevin Kawa Katrin Walther Elizabeth Glisky Ryan Richholt Matt Huentelman Lee Ryan |
author_sort |
Ariana Stickel |
title |
Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults |
title_short |
Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults |
title_full |
Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults |
title_fullStr |
Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults |
title_full_unstemmed |
Age-Modulated Associations between KIBRA, Brain Volume, and Verbal Memory among Healthy Older Adults |
title_sort |
age-modulated associations between kibra, brain volume, and verbal memory among healthy older adults |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Aging Neuroscience |
issn |
1663-4365 |
publishDate |
2018-01-01 |
description |
The resource modulation hypothesis suggests that the influence of genes on cognitive functioning increases with age. The KIBRA single nucleotide polymorphism rs17070145, associated with episodic memory and working memory, has been suggested to follow such a pattern, but few studies have tested this assertion directly. The present study investigated the relationship between KIBRA alleles (T carriers vs. CC homozygotes), cognitive performance, and brain volumes in three groups of cognitively healthy adults—middle aged (ages 52–64, n = 38), young old (ages 65–72, n = 45), and older old (ages 73–92, n = 62)—who were carefully matched on potentially confounding variables including apolipoprotein ε4 status and hypertension. Consistent with our prediction, T carriers maintained verbal memory performance with increasing age while CC homozygotes declined. Voxel-based morphometric analysis of magnetic resonance images showed an advantage for T carriers in frontal white matter volume that increased with age. Focusing on the older old group, this advantage for T carriers was also evident in left lingual gyrus gray matter and several additional frontal white matter regions. Contrary to expectations, neither KIBRA nor the interaction between KIBRA and age predicted hippocampal volumes. None of the brain regions investigated showed a CC homozygote advantage. Taken together, these data suggest that KIBRA results in decreased verbal memory performance and lower brain volumes in CC homozygotes compared to T carriers, particularly among the oldest old, consistent with the resource modulation hypothesis. |
topic |
KIBRA brain volumes age-interactions cognition resource modulation |
url |
http://journal.frontiersin.org/article/10.3389/fnagi.2017.00431/full |
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