Mapping the Relationship between Dysmorphology and Cognitive, Behavioral, and Developmental Outcomes in Children with...

Area of Science:

• Neurodevelopmental Disorders
• Genetics and Developmental Biology

Background:

• Previous research on dysmorphology and developmental outcomes in autism spectrum disorder (ASD) was limited by binary classifications and lack of comparison groups.
• Dysmorphic features (DFs) are physical anomalies that can indicate underlying developmental issues.

Purpose of the Study:

• To investigate the association between dysmorphology severity (DS) and cognitive, behavioral, and developmental outcomes in preschool children with and without ASD.
• To differentiate outcomes based on the presence or absence of intellectual disability (ID) in children with ASD.

Main Methods:

• A continuous measure of dysmorphology severity (DS) was used in preschool children aged 2-5 years.
• Study groups included children with ASD and ID (n=322), ASD without ID (n=188), and typically developing children (n=371).
• Bivariate and quantile regression analyses were employed, adjusting for various demographic and clinical factors.

Main Results:

• In children with ASD and ID, higher DS was inversely associated with expressive language, receptive language, fine motor, and visual reception skills.
• In children with ASD without ID, higher DS was inversely associated with fine motor and visual reception skills.
• No significant associations were found between DS and developmental outcomes in the general population group, nor with autistic traits or symptom severity.

Conclusions:

• Dysmorphology severity is associated with global cognitive impairment in children with ASD and ID.
• In children with ASD without ID, DS is specifically linked to deficits in fine motor and visual reception skills.
• Understanding the mechanisms linking dysmorphology to cognitive impairment in different neurodevelopmental profiles is crucial.