title: Microarray based comparative genomic hybridisation (array-CGH) detects submicroscopic chromosomal deletions and duplications in patients with learning disability/mental retardation and dysmorphic features.
abstract: The underlying causes of learning disability and dysmorphic features in many patients remain unidentified despite extensive investigation. Routine karyotype analysis is not sensitive enough to detect subtle chromosome rearrangements (less than 5 Mb). The presence of subtle DNA copy number changes was investigated by array-CGH in 50 patients with learning disability and dysmorphism, employing a DNA microarray constructed from large insert clones spaced at approximately 1 Mb intervals across the genome. Twelve copy number abnormalities were identified in 12 patients (24% of the total): seven deletions (six apparently de novo and one inherited from a phenotypically normal parent) and five duplications (one de novo and four inherited from phenotypically normal parents). Altered segments ranged in size from those involving a single clone to regions as large as 14 Mb. No recurrent deletion or duplication was identified within this cohort of patients. On the basis of these results, we anticipate that array-CGH will become a routine method of genome-wide screening for imbalanced rearrangements in children with learning disability.
authors.affiliation: University of Cambridge Department of Medical Genetics, Addenbrooke's Hospital, Hills Road, Cambridge, UK.
authors.forename: C
authors.initials: C
authors.lastname: Shaw-Smith
authors.forename: R
authors.initials: R
authors.lastname: Redon
authors.forename: L
authors.initials: L
authors.lastname: Rickman
authors.forename: M
authors.initials: M
authors.lastname: Rio
authors.forename: L
authors.initials: L
authors.lastname: Willatt
authors.forename: H
authors.initials: H
authors.lastname: Fiegler
authors.forename: H
authors.initials: H
authors.lastname: Firth
authors.forename: D
authors.initials: D
authors.lastname: Sanlaville
authors.forename: R
authors.initials: R
authors.lastname: Winter
authors.forename: L
authors.initials: L
authors.lastname: Colleaux
authors.forename: M
authors.initials: M
authors.lastname: Bobrow
authors.forename: N P
authors.initials: NP
authors.lastname: Carter
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002872:Chromosome Deletion; D025063:Chromosome Disorders / Q000235:genetics*; D020732:Cytogenetic Analysis / Q000379:methods*; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007859:Learning Disabilities / Q000235:genetics*; D008297:Male; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*