Altered Functional Network Architecture of the Brain in Prader-Willi Syndrome.

Background

Prader-Willi syndrome (PWS) is a genetic syndrome with clinical behavioral phenotypes, including autistic characteristics. However, brain functional connectivity (Fc) remains underreported. This study aimed at investigating alterations in functional network architecture in the cortical and subcortical structures of brains in individuals with PWS.

Methods

Twelve individuals with PWS (age range: 15-42 years; female 4, male 8), and 14 age- and sex-matched controls with typical development (TD), participated in a 3 Tesla resting-state functional magnetic resonance imaging study. Fc was analyzed: (1) voxel-based group independent component analysis and correlations with Autism-Spectrum Quotient (AQ) scores, (2) seed-based neuroanatomical region of interest (ROI) analysis.

Results

In individuals with PWS, AQ showed a significant positive correlation with Fc in the right frontal area, and the ROI analysis exhibited enhanced dorsolateral prefrontal Fcs compared with those in TD controls; the frontopolar-parietotemporal Fcs were attenuated. Discussion: The observed Fc indicated altered Fc in specific brain regions, which is consistent with the behavioral features in individuals with PWS. The enhanced versus attenuated connectivity in distinct frontal regions may contribute to not only autistic features but also other behavioral characteristics, and it provides a clue for better understanding of the brain-behavior relationship in PWS.