Journal
PEDIATRIC NEUROLOGY
Volume 90, Issue -, Pages 37-43Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.pediatrneurol.2018.09.008
Keywords
22q13.3 Deletion; SHANK3; Repetitive behaviors; MRI; Autism
Categories
Funding
- National Center for Advancing Translational Sciences Rare Diseases Clinical Research Network [U54NS092090]
- National Center for Advancing Translational Sciences
- National Institute of Mental Health
- National Institute of Neurological Disorders and Stroke
- Eunice Kennedy Shriver National Institute of Child Health and Human Development
- Phelan-McDermid Syndrome Foundation
- NATIONAL INSTITUTE OF MENTAL HEALTH [ZICMH002961] Funding Source: NIH RePORTER
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OBJECTIVE: Phelan-McDermid syndrome is caused by haploinsufficiency of SHANK3 on terminal chromosome 22. Knowledge about altered neuroanatomic circuitry in Phelan-McDermid syndrome comes from mouse models showing striatal hypertrophy in the basal ganglia, and from humans with evidence of cerebellar atrophy. To date, no studies have performed volumetric analysis on Phelan-McDermid syndrome patients. METHODS: We performed volumetric analysis of baseline brain MRIs of Phelan-McDermid syndrome patients (ages three to 21 years) enrolled in a prospective natural history study (ClinicalTrials.gov NCT02461420). Using MRI segmentations carried out with PSTA-PLE algorithm, we measured relative volumes (volume of the structure divided by the volume of the brain parenchyma) of basal ganglia and cerebellar structures. We compared these measurements to those of age- and sex-matched healthy controls part of another study. Among the patients, we performed linear regression of each relative volume using Repetitive Behavior Scale-Revised total score and Aberrant Behavior Checklist stereotypy score. Eleven patients with Phelan-McDermid syndrome (six females, five males) and 11 healthy controls were in this analysis. RESULTS: At time of MRI, the mean age of the patients and controls was 9.24 (5.29) years and 9.00 (4.49) years, respectively (P = 0.66). Compared to controls, patients had decreased caudate (P <= 0.013), putamen (P <= 0.026), and left pallidum (P=0.033) relative volumes. Relative volume of cerebellar vermal lobules I to V (beta coefficient = -17119, P= 0.017) decreased with increasing Repetitive Behavior Scale-Revised total score. CONCLUSIONS: The volumes of the striatum and left pallidum are decreased in individuals with Phelan-McDermid syndrome. Cerebellar vermis volume may predict repetitive behavior severity in Phelan-McDermid syndrome. These findings warrant further investigation in larger samples. (C) 2018 Elsevier Inc. All rights reserved.
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