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Williams syndrome: serotonin's association with developmental disabilities
1University of Minnesota, Department of Psychiatry, Minneapolis 55455.
Insights
Williams syndrome can occur without autism and with normal blood serotonin levels. This suggests hyperserotonemia may not be a universal marker for Williams syndrome, warranting further research into autism comorbidities.
Area of Science:
- Neurodevelopmental disorders
- Genetics and rare diseases
Background:
- Williams syndrome is a rare genetic disorder characterized by distinctive facial features, developmental delays, and cardiovascular issues.
- Previous research linked autism and Williams syndrome, with elevated blood serotonin (hyperserotonemia) noted in autistic individuals with this condition.
Observation:
- This study examined two prepubescent females with Williams syndrome who did not exhibit autistic traits.
- These individuals presented with normal blood serotonin levels, contrasting with prior observations.
Findings:
- The absence of autism and hyperserotonemia in these cases challenges the notion of a direct, invariable link between Williams syndrome, autism, and elevated serotonin.
- This suggests that hyperserotonemia is not a defining biological marker for all individuals with Williams syndrome.
Implications:
- Further investigation into the co-occurrence of developmental disorders and autism is crucial.
- Clarifying the relationship between autism and biological markers like hyperserotonemia may aid in understanding the complex etiology of these conditions.
Abstract:
Reiss et al. (1985) described two autistic children with the Williams syndrome, a dysmorphic developmental syndrome of unknown cause. Both children also showed elevated blood serotonin levels. The present report describes two prepubescent females with the characteristic features of Williams syndrome, who are not autistic and who have blood serotonin levels within the normal range. These findings suggest that further study of developmental disorders that coexist with autism may help clarify the relationship between autism and putative biological markers such as hyperserotonemia.