RT Journal
A1 Gogtay N, Hua X, Stidd R, et al
T1 DElayed white matter growth trajectory in young nonpsychotic siblings of patients with childhood-onset schizophrenia
JF Archives of General Psychiatry
JO Archives of General Psychiatry
YR 2012
FD September 1
VO 69
IS 9
SP 875
OP 884
DO 10.1001/archgenpsychiatry.2011.2084
UL http://dx.doi.org/10.1001/archgenpsychiatry.2011.2084
AB Context 
                  Nonpsychotic siblings of patients with childhood-onset schizophrenia (COS) share cortical gray matter abnormalities with their probands at an early age; these normalize by the time the siblings are aged 18 years, suggesting that the gray matter abnormalities in schizophrenia could be an age-specific endophenotype. Patients with COS also show significant white matter (WM) growth deficits, which have not yet been explored in nonpsychotic siblings.Objective 
                  To study WM growth differences in nonpsychotic siblings of patients with COS.Design 
                  Longitudinal (5-year) anatomic magnetic resonance imaging study mapping WM growth using a novel tensor-based morphometry analysis.Setting 
                  National Institutes of Health Clinical Center, Bethesda, Maryland.Participants 
                  Forty-nine healthy siblings of patients with COS (mean [SD] age, 16.1 [5.3] years; 19 male, 30 female) and 57 healthy persons serving as controls (age, 16.9 [5.3] years; 29 male, 28 female).Intervention 
                  Magnetic resonance imaging.Main Outcome Measure 
                  White matter growth rates.Results 
                  We compared the WM growth rates in 3 age ranges. In the youngest age group (7 to <14 years), we found a significant difference in growth rates, with siblings of patients with COS showing slower WM growth rates in the parietal lobes of the brain than age-matched healthy controls (false discovery rate, q = 0.05; critical P = .001 in the bilateral parietal WM; a post hoc analysis identified growth rate differences only on the left side, critical P = .004). A growth rate difference was not detectable at older ages. In 3-dimensional maps, growth rates in the siblings even appeared to surpass those of healthy individuals at later ages, at least locally in the brain, but this effect did not survive a multiple comparisons correction.Conclusions 
                  In this first longitudinal study of nonpsychotic siblings of patients with COS, the siblings showed early WM growth deficits, which normalized with age. As reported before for gray matter, WM growth may also be an age-specific endophenotype that shows compensatory normalization with age.