Abstract
Alterations in the microarchitecture of the posterior cingulum (PC), a white matter tract proximal to the hippocampus that facilitates communication between the entorhinal and cingulate cortices, have been observed in individuals with psychiatric disorders, such as depression and post-traumatic stress disorder (PTSD). PC decrements may be a heritable source of vulnerability for the development of affective disorders; however, genetic substrates for these white matter abnormalities have not been identified. The FKBP5 gene product modulates glucocorticoid receptor function and has been previously associated with differential hippocampal structure, function, and affect disorder risk. Thus, FKBP5 is an attractive genetic target for investigations of PC integrity. We examined associations between PC integrity, measured through diffusion tensor imaging (DTI) and fractional anisotropy (FA; an index of white matter integrity), and polymorphisms in the FKBP5 SNP rs1360780 in a sample of 82 traumatized female civilians. Findings indicated that, compared with individuals without this allele, individuals who carried two ‘risk’ alleles for this FKBP5 SNP (T allele; previously associated with mood and anxiety disorder risk) demonstrated significantly lower FA in the left PC, even after statistically controlling for variance associated with age, trauma exposure, and PTSD symptoms. These data suggest that specific allelic variants for an FKBP5 polymorphism are associated with decrements in the left PC microarchitecture. These white matter abnormalities may be a heritable biological marker that indicates increased vulnerability for the development of psychiatric disorders, such as PTSD.
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Acknowledgements
We thank the participants who made this work possible, as well as the staff of the Grady Trauma Project, particularly Allen W. Graham, Angelo Brown, Amreen Dharani, Jennifer S. Davis, Jennifer Winkler, Sarah Spann, and Andrew Pallos. We wish to thank Jaemin Shin and Timothy Ely for their valuable assistance with data analysis, and the Georgia State University—Georgia Institute of Technology Center for Advanced Brain Imaging for data support.
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Fani, N., King, T., Reiser, E. et al. FKBP5 Genotype and Structural Integrity of the Posterior Cingulum. Neuropsychopharmacol 39, 1206–1213 (2014). https://doi.org/10.1038/npp.2013.322
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DOI: https://doi.org/10.1038/npp.2013.322
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