Angelman syndrome: are the estimates too low?

Area of Science:

• Genetics
• Neurology
• Developmental Disabilities

Background:

• Angelman Syndrome (AS) is a rare genetic disorder characterized by developmental delay, intellectual disability, and specific behavioral features.
• AS is primarily diagnosed clinically, as genetic testing confirms the diagnosis in only about 80% of cases, often involving a maternal deletion on chromosome 15q11-13.
• There is a limited understanding of AS prevalence in adult populations, particularly those with severe developmental disabilities.

Purpose of the Study:

• To investigate the incidence and diagnostic challenges of Angelman Syndrome in adults residing in a long-term care facility.
• To highlight the potential underestimation of AS in adults with severe developmental disabilities.

Main Methods:

• Retrospective review of medical records for individuals with severe developmental disabilities.
• Clinical evaluation and diagnostic confirmation of Angelman Syndrome in a cohort of 11 adults.
• Analysis of diagnostic timelines and recognition of AS at admission versus later evaluation.

Main Results:

• Eleven adults with Angelman Syndrome were identified within a long-term residential care facility.
• The diagnosis of AS was not recognized at the time of admission for these individuals.
• This finding suggests that AS may be underdiagnosed in adults with severe developmental disabilities.

Conclusions:

• Angelman Syndrome may be more prevalent in adults with severe developmental disabilities than currently reported.
• Clinical diagnosis of AS in this population is often delayed or missed.
• Further research is needed to accurately determine the incidence of AS in adults with developmental disabilities.