title: Delineating the 17q24.2-q24.3 microdeletion syndrome phenotype.
abstract: We present an 11-year-old girl with a 2.3 Mb de novo interstitial deletion in chromosome 17q24.2-q24.3 identified by array CGH. The phenotype in this case includes skeletal malformations (lower limb bowing, progressive scoliosis and dental abnormalities), feeding problems, mild learning difficulties, and a characteristic facial appearance. Much of the phenotype is attributable to the deletion of KCNJ2, which causes Andersen Tawil Syndrome (ATS), but the facial appearance is not typical. We hypothesise that the presence of mild channelopathy-related features seen in ATS may be explained by haplo-insufficiency, leading to a reduced number of functionally normal Kir2.1 channels. Comparison is made to previous reports describing overlapping 17q deletions, and potential candidate genes which account for the specific phenotypic similarities with this case are highlighted.
authors.affiliation: North West Thames Regional Genetics Unit, London, UK. jlestner@nhs.net
authors.forename: Jodi M
authors.initials: JM
authors.lastname: Lestner
authors.forename: Richard
authors.initials: R
authors.lastname: Ellis
authors.forename: Natalie
authors.initials: N
authors.lastname: Canham
mesh_terms: D002648:Child; D002872:Chromosome Deletion; D002886:Chromosomes, Human, Pair 17; D055028:Comparative Genomic Hybridization; D019066:Facies; D005260:Female; D005351:Fibromatosis, Gingival / Q000175:diagnosis*; D006801:Humans; D006983:Hypertrichosis / Q000175:diagnosis*; D007866:Leg / Q000002:abnormalities; D010641:Phenotype