Effects of PER3 clock gene polymorphisms on aging-related changes of the cerebral cortex

Effects of PER3 clock gene polymorphisms on aging-related changes of the cerebral cortex Considerable evidence suggests that circadian rhythmicity is progressively disrupted in senescence. Among clock genes, Period3 (PER3) has been associated with circadian phenotypes, homeostatic regulation of sleep, and cognitive performance in young adults. However, the effects of PER3 genotype on aging-related changes in both cognitive function and cortical integrity remain largely unknown. To shed light into this issue, we have investigated differences in cognitive performance, patterns of cortical thickness, and cortical glucose consumption in normal elderly subjects homozygous carriers of the short (PER34/4, n = 32) and long repeat alleles (PER35/5, n = 32). Relationships between cognitive performance and cortical thickness/metabolism were further explored for each PER3 genotype. We found that PER35/5 carriers had poorer cognitive performance (attention, executive function, semantic memory, and verbal fluency) and lower cortical integrity (structural and functional) than PER34/4. PER35/5 further showed thinning of temporo–parietal areas, and reductions of glucose consumption in fronto–temporo–parietal regions bilaterally. Moreover, PER35/5 subjects exhibited significant correlations between decreased glucose metabolism in fronto–parietal regions and poorer cognitive flexibility, though only correlations with lower glucose consumption of the supramarginal gyrus distinguished PER35/5 from PER34/4 groups. Overall, these findings enhance our understanding on the gene–brain interaction in aging, and may have further implications for the detection of subclinical cognitive decline associated with PER3 genotypes in late life. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Brain Structure and Function Springer Journals

Effects of PER3 clock gene polymorphisms on aging-related changes of the cerebral cortex

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Publisher
Springer Journals
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany
Subject
Biomedicine; Neurosciences; Cell Biology; Neurology
ISSN
1863-2653
eISSN
1863-2661
D.O.I.
10.1007/s00429-017-1513-0
Publisher site
See Article on Publisher Site

Abstract

Considerable evidence suggests that circadian rhythmicity is progressively disrupted in senescence. Among clock genes, Period3 (PER3) has been associated with circadian phenotypes, homeostatic regulation of sleep, and cognitive performance in young adults. However, the effects of PER3 genotype on aging-related changes in both cognitive function and cortical integrity remain largely unknown. To shed light into this issue, we have investigated differences in cognitive performance, patterns of cortical thickness, and cortical glucose consumption in normal elderly subjects homozygous carriers of the short (PER34/4, n = 32) and long repeat alleles (PER35/5, n = 32). Relationships between cognitive performance and cortical thickness/metabolism were further explored for each PER3 genotype. We found that PER35/5 carriers had poorer cognitive performance (attention, executive function, semantic memory, and verbal fluency) and lower cortical integrity (structural and functional) than PER34/4. PER35/5 further showed thinning of temporo–parietal areas, and reductions of glucose consumption in fronto–temporo–parietal regions bilaterally. Moreover, PER35/5 subjects exhibited significant correlations between decreased glucose metabolism in fronto–parietal regions and poorer cognitive flexibility, though only correlations with lower glucose consumption of the supramarginal gyrus distinguished PER35/5 from PER34/4 groups. Overall, these findings enhance our understanding on the gene–brain interaction in aging, and may have further implications for the detection of subclinical cognitive decline associated with PER3 genotypes in late life.

Journal

Brain Structure and FunctionSpringer Journals

Published: Sep 12, 2017

References

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