De novo mosaic ring chromosome 18 in a child with mental retardation, epilepsy and immunological problems
Adriana Lo-Castro1, Nadia El-Malhany, Cinzia Galasso
1Department of Neuroscience, Paediatric Neurology Unit, Tor Vergata University of Rome, Viale Oxford 81, 00133 Rome, Italy. a.locastro@libero.it
Abstract:
Ring chromosome 18 [r(18)] is a disorder in which one or both ends of chromosome 18 are lost and joined forming a ring-shaped figures. R(18) patients can therefore show features of 18q-, 18p- syndrome or a combination of both, depending on the size of the 18p and 18q deleted regions. The phenotype of the r(18) is characterized by developmental delay/mental retardation, typical facial dysmorphisms, major abnormalities and immunological problems. Here we report a case of de novo mosaic r(18) with a characterization by array-based comparative genomic hybridization analysis, and discuss the phenotypic correlation in r(18) also through a comparison with previously described cases of the literature.
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