Brain perfusion bridges virtual-reality spatial behavior to TPH2 genotype for head acceleration events.

Abstract:

:Neuroimaging demonstrates that athletes of collision sports can suffer significant changes to their brain in the absence of concussion, due to head acceleration event (HAE) exposure. In a sample of 24 male Division I collegiate football players, we examine the relationships between TPH2, a gene involved in neurovascular function, regional cerebral blood flow (rCBF) measured by arterial spin labeling and virtual reality (VR) motor performance, both preseason and across a single football season. For the preseason, TPH2 T-carriers showed lower rCBF in two left hemisphere foci (fusiform gyrus/thalamus/hippocampus and cerebellum) in association with higher (better performance) VR Reaction Time, a dynamic measure of sensory-motor reactivity and efficiency of visual-spatial processing. For TPH2 CC homozygotes, higher preseason rCBF in these foci was associated with better performance on VR Reaction Time. A similar relationship was observed across the season, where TPH2 T-carriers showed improved VR Reaction Time associated with decreases in rCBF in the right hippocampus/amygdala, left middle temporal lobe and left insula/putamen/pallidum. In contrast, TPH2 CC homozygotes showed improved VR Reaction Time associated with increases in rCBF in the same three clusters. These findings show TPH2 T-carriers have an abnormal relationship between rCBF and the efficiency of visual-spatial processing that is exacerbated after a season of high impact sports in the absence of diagnosable concussion. Such gene-environment interactions associated with behavioral changes after exposure to repetitive HAEs have been unrecognized with current clinical analytic tools, and warrant further investigation. Our results demonstrate the importance of considering neurovascular factors along with traumatic axonal injury to study long-term effects of repetitive HAEs.

journal_name

J Neurotrauma

journal_title

Journal of neurotrauma

authors

Chen Y,Herrold A,Walter A,Reilly J,Seidenberg P,Nauman E,Talavage TM,Vandenbergh D,Slobounov S,Breiter H

doi

10.1089/neu.2020.7016

subject

Has Abstract

pub_date

2021-01-07 00:00:00

eissn

0897-7151

issn

1557-9042

pub_type

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