Journal
EUROPEAN JOURNAL OF MEDICAL GENETICS
Volume 55, Issue 12, Pages 700-704Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ejmg.2012.08.003
Keywords
Interstitial deletion of 17q; Andersen Tawil Syndrome; Microdeletion syndrome; KCNJ2; MAP2K6; ATP-binding cassette transporters
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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. (C) 2012 Elsevier Masson SAS. All rights reserved.
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