White-Sutton syndrome
White-Sutton syndrome is a neurodevelopmental disorder characterized by intellectual disability, behavioral features, and distinct physical characteristics.
Overview
Most individuals with White-Sutton syndrome exhibit features of autism spectrum disorder (ASD), such as impaired social skills and communication challenges. However, these may be accompanied by an unusually friendly demeanor. Development is generally delayed, with speech and language skills typically more affected than motor skills.
Symptoms
- Physical Features: An unusually small head (microcephaly), a wide and short skull, wide-set eyes, a flat or sunken mid-face, and a pointed chin.
- Behavioral and Developmental: Hyperactivity, sleeping difficulties, and intellectual disability ranging from borderline to severe.
- Systemic: Vision defects (particularly farsightedness), gastrointestinal problems, obesity, and short stature. Some individuals are born with a diaphragmatic hernia, a hole in the muscle separating the abdomen from the chest.
Causes
The syndrome is caused by mutations in the POGZ gene. This gene encodes a protein that binds to chromatin, the complex of DNA and proteins that packages chromosomes. By facilitating chromatin remodeling, the POGZ protein helps regulate gene expression. Mutations impair this binding ability, leading to abnormal gene expression that disrupts brain development and other body systems.
Inheritance
White-Sutton syndrome is inherited in an autosomal dominant pattern. Most cases result from new (de novo) mutations that occur during the formation of reproductive cells or in early embryonic development, meaning there is typically no family history of the condition.
