Reduced Fractional Anisotropy and Axial Diffusivity in White Matter in 22q11.2 Deletion Syndrome: A Pilot Study
Z. Kikinis, T. Asami, S. Bouix, C. Finn, T. Ballinger, E. Tworog, R. Kucherlapati, R. Kikinis, M. E. Shenton, M. Kubicki
Volume 141, Pages 35 - 39
Individuals with 22q11.2 deletion syndrome (22q11.2DS) evince a 30 percent incidence of schizophrenia. We compared the white matter (WM) of 22q11.2DS patients without schizophrenia to a group of matched healthy controls using Tract-Based-Spatial-Statistics (TBSS). We found localized reduction of Fractional Anisotropy (FA) and Axial Diffusivity (AD; measure of axonal integrity) in WM underlying the left parietal lobe. No changes in Radial Diffusivity (RD; measure of myelin integrity) were observed. Of note, studies in chronic schizophrenia patients report reduced FA, no changes in AD, and increases in RD in WM. Our findings suggest different WM microstructural pathology in 22q11.2DS than in patients with schizophrenia.
Kikinis Z, Asami T, Bouix S, Finn C, Ballinger T, Tworog E, Kucherlapati R, Kikinis R, Shenton ME, Kubicki M. Reduced fractional anisotropy and axial diffusivity in white matter in 22q11.2 deletion syndrome: A pilot study. Schizophrenia Research 2012;141:35 - 39.