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The authors examined how the COVID-19 pandemic affected the behavioral health of people with intellectual and developmental disabilities (IDD).A modified version of the Coronavirus Health Impact Survey-Adapted for Autism and Related Neurodevelopmental Conditions was sent to the authors' clinical networks and IDD-affiliated organizations from March to June 2021.In total, 437 people with IDD or their caregivers responded to the survey. Diagnoses included intellectual disability (51%) and autism spectrum disorder (48%). More than half (52%) of respondents reported worsened mental health. Losing access to services correlated with declining mental health. Interventions suggested to improve behavioral health included more time with friends and family (68%), more time outdoors (61%), and access to community activities (59%).COVID-19 affected the behavioral health of individuals with IDD. Survey results highlight the opportunity to leverage physical activity and pandemic-safe social supports as accessible means to mitigate gaps in services.

Cerebral palsy (CP) is the most common childhood motor disability, yet its link to single-gene disorders is under-characterized. To explore the genetic landscape of CP, we conducted whole exome sequencing (WES) in a cohort of patients with CP.We performed comprehensive phenotyping and WES on a prospective cohort of individuals with cryptogenic CP (who meet criteria for CP; have no risk factors), non-cryptogenic CP (who meet criteria for CP; have at least one risk factor), and CP masqueraders (who could be diagnosed with CP, but have regression/progressive symptoms). We characterized motor phenotypes, ascertained medical comorbidities, and classified brain MRIs. We analyzed WES data using an institutional pipeline.We included 50 probands in this analysis (20 females, 30 males). Twenty-four had cryptogenic CP, 20 had non-cryptogenic CP, five had CP masquerader classification, and one had unknown classification. Hypotonic-ataxic subtype showed a difference in prevalence across the classification groups (p = 0.01). Twenty-six percent of participants (13/50) had a pathogenic/likely pathogenic variant in 13 unique genes (ECHS1, SATB2, ZMYM2, ADAT3, COL4A1, THOC2, SLC16A2, SPAST, POLR2A, GNAO1, PDHX, ACADM, ATL1), including one patient with two genetic disorders (ACADM, PDHX) and two patients with a SPAST-related disorder. The CP masquerader category had the highest diagnostic yield (n = 3/5, 60%), followed by the cryptogenic CP category (n = 7/24, 29%). Fifteen percent of patients with non-cryptogenic CP (n = 3/20) had a Mendelian disorder on WES.WES demonstrated a significant prevalence of Mendelian disorders in individuals clinically diagnosed with CP, including in individuals with known CP risk factors.