Microduplication 22q11.2 in a child with autism spectrum disorder: clinical and genetic study
Article first published online: 19 NOV 2008
Copyright © 2008 Mac Keith Press
Developmental Medicine & Child Neurology
Volume 50, Issue 12, pages 953–955, December 2008
How to Cite
Ramelli, G. P., Silacci, C., Ferrarini, A., Cattaneo, C., Visconti, P. and Pescia, G. (2008), Microduplication 22q11.2 in a child with autism spectrum disorder: clinical and genetic study. Developmental Medicine & Child Neurology, 50: 953–955. doi: 10.1111/j.1469-8749.2008.03048.x
- Issue published online: 19 NOV 2008
- Article first published online: 19 NOV 2008
- Accepted for publication 13th November 2007.
Microduplication of the 22q11.2 chromosomal region has been recognized since 1999 and has been associated with a highly variable phenotype. Neurodevelopmental impairment and behavioural problems are very common in patients with 22q11.2 duplication. Autism spectrum disorders (ASDs) have previously been reported in only two patients with 22q11.2 duplication and striking dysmorphic features. We report here on a 4-year-old male of healthy consanguineous parents presenting with ASD according to DSMIV, revised, criteria as a primary manifestation. The child walked at 16 months and started to say one word and some sounds. Parents noticed a subsequent developmental arrest. At 4 years his functional development age, evaluated by the Psychoeducational Profile, was roughly 6 months. Mild non-specific facial dysmorphism was noted. Genetic analyses of the child demonstrated a de novo microduplication of the 22q11.2 chromosomal region. This genetic anomaly was best seen in interphases of blood lymphocytes and in buccal smear nuclei. Our case illustrates once again the clinical heterogeneity of the 22q11.2 duplication as well as the wide genetic complexity of ASD. We suggest that genetic evaluation of ASD should include fluorescence in-situ hybridization analysis of the 22q11.2 chromosomal region.