Those deletion sizes had been associated with the major neurological symptoms of PMS, larger deletions were associated with increased likelihood of dysmorphic features and medical comorbidities, while small deletions or SHANK3 pathogenic variants correlated with autism spectrum disorder, seizures, hypotonia, sleep disturbances, abnormal brain MRI, gastroesophageal reflux, and certain dysmorphic features (7). This evidence concerns the gene SHANK3 and autism spectrum disorder.