title: Chromosome 22q11.2 microdeletions in velocardiofacial syndrome patients with widely variable manifestations.
abstract: Velocardiofacial syndrome (VCFS) and the DiGeorge sequence (DGS) are caused by 22q11.2 deletions. Fluorescence in situ hybridization (FISH) using the DiGeorge chromosome region (DGCR) probe (Oncor) was used to detect 31 deletions in 100 patients with possible VCFS. Retrospective FISH analysis of archived slides from 14 patients originally studied only by high-resolution G banding detected 6 patients with a DGCR deletion, and only 2 of these 6 had a microscopically visible chromosome deletion. The 4 familial deletions found exhibited a wide range of clinical presentations within each family. Comparison of clinical characteristics of patients with and without the DGCR deletion determined findings predictive of the deletion: abundant or unruly scalp hair; narrow palpebral fissures; a laterally "built-up" nose; velopharyngeal inadequacy; thymic hypoplasia; and congenital heart defects, specifically tetralogy of Fallot, ventriculoseptal defect, and interrupted aortic arch.
authors.affiliation: Department of Pediatrics, University of California, San Francisco, USA.
authors.forename: J B
authors.initials: JB
authors.lastname: Ravnan
authors.forename: E
authors.initials: E
authors.lastname: Chen
authors.forename: M
authors.initials: M
authors.lastname: Golabi
authors.forename: R V
authors.initials: RV
authors.lastname: Lebo
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations / Q000175:diagnosis / Q000235:genetics*; D002872:Chromosome Deletion; D025063:Chromosome Disorders; D002892:Chromosomes, Human, Pair 22 / Q000235:genetics*; D019465:Craniofacial Abnormalities / Q000175:diagnosis / Q000235:genetics*; D015342:DNA Probes; D004062:DiGeorge Syndrome / Q000235:genetics*; D005260:Female; D006330:Heart Defects, Congenital / Q000235:genetics; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D007223:Infant; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D010375:Pedigree; D010641:Phenotype; D012189:Retrospective Studies; D013577:Syndrome
chemical_list: D015342:DNA Probes