Challenging Case: The Role of Genetic Testing in Complex Autism

Area of Science:

• Genetics
• Neurodevelopmental Disorders
• Epilepsy

Background:

• Autism spectrum disorder (ASD) and epilepsy often present with complex neurodevelopmental challenges.
• Comprehensive genetic evaluations are crucial for diagnosing rare neurodevelopmental disorders.

Observation:

• A 12-year-old boy with developmental delays, ASD, cerebral palsy, and intractable seizures underwent extensive prior genetic testing with normal results.
• Subsequent whole-exome sequencing revealed a de novo STXBP1 pathogenic variant (c.874C>T, p.Arg292Cys).

Findings:

• The identified STXBP1 variant is associated with developmental and epileptic encephalopathy.
• The patient's clinical presentation, including refractory epilepsy, ASD, intellectual disability, and movement disorders, is consistent with STXBP1 encephalopathy.

Implications:

• Genetic testing, such as whole-exome sequencing, can provide a definitive diagnosis for complex neurodevelopmental disorders.
• Identifying specific genetic variants like STXBP1 can guide clinical management and family counseling for rare encephalopathies.