Language and Communication Deficits in Chromosome 16p11.2 Deletion Syndrome

Area of Science:

• Genetics
• Neurodevelopmental Disorders
• Speech and Language Pathology

Background:

• Chromosome 16p11.2 deletion syndrome is a rare genetic disorder associated with a range of developmental challenges.
• Affected individuals often present with dysmorphisms, motor difficulties, developmental delay, and varying degrees of intellectual disability (ID) or autism spectrum disorder (ASD) traits.
• The specific speech, language, and communication (dis)abilities in this syndrome, particularly in individuals without ID or ASD, require further detailed characterization.

Purpose of the Study:

• To longitudinally profile the speech, language, and communication problems in a child with Chromosome 16p11.2 deletion syndrome.
• To investigate these issues in the absence of intellectual disability (ID) or autism spectrum disorder (ASD).
• To contribute to a precise understanding of communication deficits in this genetic condition.

Main Methods:

• Utilized standardized speech and language tests.
• Analyzed samples of naturalistic speech.
• Conducted a longitudinal assessment of a single case.

Main Results:

• The proband exhibited impaired expressive and receptive language abilities.
• Observed dysprosody and ASD-like communication deficits, including poor interactive skills and perseverative speech.
• Demonstrated a lack of metapragmatic awareness and reduced communicative use of gaze, meeting criteria for social pragmatic communication disorder.

Conclusions:

• Language and communication impairment are core symptoms of Chromosome 16p11.2 deletion syndrome, irrespective of ID or ASD diagnosis.
• Findings underscore the need to consider communication deficits as a primary feature.
• Results inform potential therapeutic interventions for children with 16p11.2 deletion syndrome, especially those without co-occurring ID or ASD.