title: An atypical 7q11.23 deletion in a normal IQ Williams-Beuren syndrome patient.
abstract: Williams-Beuren syndrome (WBS; OMIM no. 194050) is a multisystemic neurodevelopmental disorder caused by a hemizygous deletion of 1.55 Mb on chromosome 7q11.23 spanning 28 genes. Haploinsufficiency of the ELN gene was shown to be responsible for supravalvular aortic stenosis and generalized arteriopathy, whereas LIMK1, CLIP2, GTF2IRD1 and GTF2I genes were suggested to be linked to the specific cognitive profile and craniofacial features. These insights for genotype-phenotype correlations came from the molecular and clinical analysis of patients with atypical deletions and mice models. Here we report a patient showing mild WBS physical phenotype and normal IQ, who carries a shorter 1 Mb atypical deletion. This rearrangement does not include the GTF2IRD1 and GTF2I genes and only partially the BAZ1B gene. Our results are consistent with the hypothesis that hemizygosity of the GTF2IRD1 and GTF2I genes might be involved in the facial dysmorphisms and in the specific motor and cognitive deficits observed in WBS patients.
authors: Department of Pediatrics, University of Torino, Torino, Italy.
authors: Giovanni Battista
authors: GB
authors: Ferrero
authors: Cédric
authors: C
authors: Howald
authors: Lucia
authors: L
authors: Micale
authors: Elisa
authors: E
authors: Biamino
authors: Bartolomeo
authors: B
authors: Augello
authors: Carmela
authors: C
authors: Fusco
authors: Maria Giuseppina
authors: MG
authors: Turturo
authors: Serena
authors: S
authors: Forzano
authors: Alexandre
authors: A
authors: Reymond
authors: Giuseppe
authors: G
authors: Merla
mesh_terms: D000328:Adult; D002648:Child; D002872:Chromosome Deletion; D003071:Cognition; D005260:Female; D015894:Genome, Human / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D007223:Infant; D007231:Infant, Newborn; D007361:Intelligence Tests; D008297:Male; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011247:Pregnancy; D018980:Williams Syndrome / Q000235:genetics*