title: Association of FKBP5 polymorphisms and resting-state activity in a frontotemporal-parietal network.
abstract: The FKBP5 polymorphism is a key regulator of the glucocorticoid system underpinning stress responsivity, and risk alleles can increase vulnerability for developing posttraumatic stress disorder. To delineate the specific role of FKBP5 risk alleles unencumbered by the confounds of psychopathology, this study investigated whether high-risk alleles of the FKBP5 polymorphism are characterized by distinctive neural activity during resting state. Thirty-seven healthy participants were selected on the basis of four SNPs in the FKBP5 gene region (rs3800373, rs9296158, rs1360780 and rs9470080) to determine participants who were carriers of the FKBP5 high- and low-risk alleles. Spatial maps, power spectra and connectivity in neural networks active during resting state were assessed with functional magnetic resonance imaging (fMRI). During resting-state fMRI, FKBP5 low-risk allele group displayed more power in the low frequency range (<0.1 Hz) than the high-risk allele group, who had significantly more power in higher frequency bins (>0.15 Hz). This difference was apparent only in a frontotemporoparietal network underpinning salience detection and emotion processing. This study provides initial evidence that the risk alleles of the FKBP5 polymorphism are associated with different resting-state activity in a frontotemporal-parietal network, and may point to mechanisms underpinning high-risk carriers' vulnerability to severe stress reactions.
authors.affiliation: School of Psychology, University of New South Wales, Sydney, NSW, Australia.|Department of Psychiatry, University of Sydney, Sydney, NSW, Australia.
authors.forename: R A
authors.initials: RA
authors.lastname: Bryant
authors.affiliation: School of Psychology, University of New South Wales, Sydney, NSW, Australia.|School of Psychological Sciences, University of Melbourne, VIC, Australia.
authors.forename: K L
authors.initials: KL
authors.lastname: Felmingham
authors.affiliation: School of Psychology, University of New South Wales, Sydney, NSW, Australia.
authors.forename: B
authors.initials: B
authors.lastname: Liddell
authors.affiliation: Department of Psychiatry, University of Sydney, Sydney, NSW, Australia.
authors.forename: P
authors.initials: P
authors.lastname: Das
authors.affiliation: Department of Psychiatry, University of Sydney, Sydney, NSW, Australia.
authors.forename: G S
authors.initials: GS
authors.lastname: Malhi
mesh_terms: D000483:Alleles; D001143:Arousal / Q000235:genetics / Q000502:physiology; D001931:Brain Mapping; D004644:Emotions / Q000502:physiology; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology*; D006580:Genetic Carrier Screening; D005838:Genotype; D006801:Humans; D007030:Hypothalamo-Hypophyseal System / Q000503:physiopathology; D008279:Magnetic Resonance Imaging; D008297:Male; D009415:Nerve Net / Q000503:physiopathology*; D010296:Parietal Lobe / Q000503:physiopathology*; D010913:Pituitary-Adrenal System / Q000503:physiopathology; D011110:Polymorphism, Genetic / Q000235:genetics*; D012306:Risk; D013313:Stress Disorders, Post-Traumatic / Q000235:genetics* / Q000503:physiopathology; D022021:Tacrolimus Binding Proteins / Q000235:genetics*; D013702:Temporal Lobe / Q000503:physiopathology*; D055815:Young Adult; D000099159:Tacrolimus Binding Protein 5
chemical_list: D022021:Tacrolimus Binding Proteins; D000099159:Tacrolimus Binding Protein 5